Enhanced force-resync mechanism to guarantee consistency across all players in a same room upon anyone reconnected.

Applied snapping on all-sides to avoid random zero-overlap detection uncertainty.
2025-10-16 20:16:37 +00:00 · 2022-12-16 18:59:58 +08:00 · 2022-12-16 15:57:49 +08:00
10 changed files with 514 additions and 419 deletions
--- a/battle_srv/models/room.go
+++ b/battle_srv/models/room.go
@@ -61,13 +61,13 @@ const (
 )

 const (
-	ATK_CHARACTER_STATE_IDLE1        = 0
-	ATK_CHARACTER_STATE_WALKING      = 1
-	ATK_CHARACTER_STATE_ATK1         = 2
-	ATK_CHARACTER_STATE_ATKED1       = 3
-	ATK_CHARACTER_STATE_INAIR_IDLE1  = 4
-	ATK_CHARACTER_STATE_INAIR_ATK1   = 5
-	ATK_CHARACTER_STATE_INAIR_ATKED1 = 6
+	ATK_CHARACTER_STATE_IDLE1        = int32(0)
+	ATK_CHARACTER_STATE_WALKING      = int32(1)
+	ATK_CHARACTER_STATE_ATK1         = int32(2)
+	ATK_CHARACTER_STATE_ATKED1       = int32(3)
+	ATK_CHARACTER_STATE_INAIR_IDLE1  = int32(4)
+	ATK_CHARACTER_STATE_INAIR_ATK1   = int32(5)
+	ATK_CHARACTER_STATE_INAIR_ATKED1 = int32(6)
 )

 const (
@@ -401,11 +401,11 @@ func (pR *Room) StartBattle() {
 	pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY = float64(spaceW)*0.5, float64(spaceH)*0.5
 	pR.refreshColliders(spaceW, spaceH)

-	/**
-		 * Will be triggered from a goroutine which executes the critical `Room.AddPlayerIfPossible`, thus the `battleMainLoop` should be detached.
-		 * All of the consecutive stages, e.g. settlement, dismissal, should share the same goroutine with `battleMainLoop`.
-	     *
-	     * As "defer" is only applicable to function scope, the use of "pR.InputsBufferLock" within "battleMainLoop" is embedded into each subroutine call.
+	/*
+			  Will be triggered from a goroutine which executes the critical `Room.AddPlayerIfPossible`, thus the `battleMainLoop` should be detached.
+			  All of the consecutive stages, e.g. settlement, dismissal, should share the same goroutine with `battleMainLoop`.
+
+		      As "defer" is only applicable to function scope, the use of "pR.InputsBufferLock" within "battleMainLoop" is embedded into each subroutine call.
 	*/
 	battleMainLoop := func() {
 		defer func() {
@@ -451,10 +451,7 @@ func (pR *Room) StartBattle() {
 						thatPlayerBattleState := atomic.LoadInt32(&(player.BattleState)) // Might be changed in "OnPlayerDisconnected/OnPlayerLost" from other threads
 						// [WARNING] DON'T try to send any message to an inactive player!
 						switch thatPlayerBattleState {
-						case PlayerBattleStateIns.DISCONNECTED:
-						case PlayerBattleStateIns.LOST:
-						case PlayerBattleStateIns.EXPELLED_DURING_GAME:
-						case PlayerBattleStateIns.EXPELLED_IN_DISMISSAL:
+						case PlayerBattleStateIns.DISCONNECTED, PlayerBattleStateIns.LOST, PlayerBattleStateIns.EXPELLED_DURING_GAME, PlayerBattleStateIns.EXPELLED_IN_DISMISSAL:
 							continue
 						}
 						kickoffFrame := pR.RenderFrameBuffer.GetByFrameId(0).(*RoomDownsyncFrame)
@@ -500,16 +497,12 @@ func (pR *Room) StartBattle() {
 			case inputsBufferSnapshot := <-playerDownsyncChan:
 				nowBattleState := atomic.LoadInt32(&pR.State)
 				switch nowBattleState {
-				case RoomBattleStateIns.IDLE:
-				case RoomBattleStateIns.STOPPING_BATTLE_FOR_SETTLEMENT:
-				case RoomBattleStateIns.IN_SETTLEMENT:
-				case RoomBattleStateIns.IN_DISMISSAL:
+				case RoomBattleStateIns.IDLE, RoomBattleStateIns.STOPPING_BATTLE_FOR_SETTLEMENT, RoomBattleStateIns.IN_SETTLEMENT, RoomBattleStateIns.IN_DISMISSAL:
 					Logger.Warn(fmt.Sprintf("Battle is not waiting/preparing/active for playerDownsyncChan for (roomId: %d, playerId:%d)", pR.Id, playerId))
 					return
 				}
-
-				pR.downsyncToSinglePlayer(playerId, player, inputsBufferSnapshot.RefRenderFrameId, inputsBufferSnapshot.UnconfirmedMask, inputsBufferSnapshot.ToSendInputFrameDownsyncs)
-				Logger.Debug(fmt.Sprintf("Sent inputsBufferSnapshot(refRenderFrameId:%d, unconfirmedMask:%v) to for (roomId: %d, playerId:%d)#2", inputsBufferSnapshot.RefRenderFrameId, inputsBufferSnapshot.UnconfirmedMask, pR.Id, playerId))
+				pR.downsyncToSinglePlayer(playerId, player, inputsBufferSnapshot.RefRenderFrameId, inputsBufferSnapshot.UnconfirmedMask, inputsBufferSnapshot.ToSendInputFrameDownsyncs, inputsBufferSnapshot.ShouldForceResync)
+				// Logger.Debug(fmt.Sprintf("Sent inputsBufferSnapshot(refRenderFrameId:%d, unconfirmedMask:%v) to for (roomId: %d, playerId:%d)#2", inputsBufferSnapshot.RefRenderFrameId, inputsBufferSnapshot.UnconfirmedMask, pR.Id, playerId))
 			default:
 			}
 		}
@@ -754,7 +747,7 @@ func (pR *Room) OnDismissed() {
 	pR.RollbackEstimatedDtNanos = 16666666 // A little smaller than the actual per frame time, just for logging FAST FRAME
 	dilutedServerFps := float64(55.0)
 	pR.dilutedRollbackEstimatedDtNanos = int64(float64(pR.RollbackEstimatedDtNanos) * float64(pR.ServerFps) / dilutedServerFps)
-	pR.BattleDurationFrames = 60 * pR.ServerFps
+	pR.BattleDurationFrames = 120 * pR.ServerFps
 	pR.BattleDurationNanos = int64(pR.BattleDurationFrames) * (pR.RollbackEstimatedDtNanos + 1)
 	pR.InputFrameUpsyncDelayTolerance = 2
 	pR.MaxChasingRenderFramesPerUpdate = 8
@@ -837,10 +830,7 @@ func (pR *Room) OnPlayerDisconnected(playerId int32) {
 	if player, existent := pR.Players[playerId]; existent {
 		thatPlayerBattleState := atomic.LoadInt32(&(player.BattleState))
 		switch thatPlayerBattleState {
-		case PlayerBattleStateIns.DISCONNECTED:
-		case PlayerBattleStateIns.LOST:
-		case PlayerBattleStateIns.EXPELLED_DURING_GAME:
-		case PlayerBattleStateIns.EXPELLED_IN_DISMISSAL:
+		case PlayerBattleStateIns.DISCONNECTED, PlayerBattleStateIns.LOST, PlayerBattleStateIns.EXPELLED_DURING_GAME, PlayerBattleStateIns.EXPELLED_IN_DISMISSAL:
 			Logger.Info("Room OnPlayerDisconnected[early return #1]:", zap.Any("playerId", playerId), zap.Any("playerBattleState", pR.Players[playerId].BattleState), zap.Any("roomId", pR.Id), zap.Any("nowRoomBattleState", pR.State), zap.Any("nowRoomEffectivePlayerCount", pR.EffectivePlayerCount))
 			return
 		}
@@ -1278,6 +1268,7 @@ func (pR *Room) applyInputFrameDownsyncDynamics(fromRenderFrameId int32, toRende

 // TODO: Write unit-test for this function to compare with its frontend counter part
 func (pR *Room) applyInputFrameDownsyncDynamicsOnSingleRenderFrame(delayedInputFrame *InputFrameDownsync, currRenderFrame *RoomDownsyncFrame, collisionSysMap map[int32]*resolv.Object) *RoomDownsyncFrame {
+	topPadding, bottomPadding, leftPadding, rightPadding := pR.SnapIntoPlatformOverlap, pR.SnapIntoPlatformOverlap, pR.SnapIntoPlatformOverlap, pR.SnapIntoPlatformOverlap
 	// [WARNING] This function MUST BE called while "pR.InputsBufferLock" is locked!
 	nextRenderFramePlayers := make(map[int32]*PlayerDownsync, pR.Capacity)
 	// Make a copy first
@@ -1344,9 +1335,9 @@ func (pR *Room) applyInputFrameDownsyncDynamicsOnSingleRenderFrame(delayedInputF
 				}
 				if !characStateAlreadyInAir && characStateIsInterruptWaivable {
 					thatPlayerInNextFrame.VelY = pR.JumpingInitVelY
-					if 1 == currPlayerDownsync.JoinIndex {
-						Logger.Info(fmt.Sprintf("playerId=%v, joinIndex=%v jumped at {renderFrame.id: %d, virtualX: %d, virtualY: %d, nextVelX: %d, nextVelY: %d}, delayedInputFrame.id=%d", playerId, joinIndex, currRenderFrame.Id, currPlayerDownsync.VirtualGridX, currPlayerDownsync.VirtualGridY, thatPlayerInNextFrame.VelX, thatPlayerInNextFrame.VelY, delayedInputFrame.InputFrameId))
-					}
+					// if 1 == currPlayerDownsync.JoinIndex {
+					// 	Logger.Info(fmt.Sprintf("playerId=%v, joinIndex=%v jumped at {renderFrame.id: %d, virtualX: %d, virtualY: %d, nextVelX: %d, nextVelY: %d, nextCharacterState=%d, inAir=%v}, delayedInputFrame.id=%d", playerId, joinIndex, currRenderFrame.Id, currPlayerDownsync.VirtualGridX, currPlayerDownsync.VirtualGridY, thatPlayerInNextFrame.VelX, thatPlayerInNextFrame.VelY, thatPlayerInNextFrame.CharacterState, currPlayerDownsync.InAir, delayedInputFrame.InputFrameId))
+					// }
 				}
 			}

@@ -1395,9 +1386,12 @@ func (pR *Room) applyInputFrameDownsyncDynamicsOnSingleRenderFrame(delayedInputF
 		currPlayerDownsync, thatPlayerInNextFrame := currRenderFrame.Players[playerId], nextRenderFramePlayers[playerId]
 		// Reset playerCollider position from the "virtual grid position"
 		newVx, newVy := currPlayerDownsync.VirtualGridX+currPlayerDownsync.VelX, currPlayerDownsync.VirtualGridY+currPlayerDownsync.VelY
+		if thatPlayerInNextFrame.VelY == pR.JumpingInitVelY {
+			newVy += thatPlayerInNextFrame.VelY
+		}

-		colliderWidth, colliderHeight := player.ColliderRadius*2, player.ColliderRadius*4
-		playerCollider.X, playerCollider.Y = VirtualGridToPolygonColliderBLPos(newVx, newVy, colliderWidth*0.5, colliderHeight*0.5, pR.SnapIntoPlatformOverlap, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY, pR.VirtualGridToWorldRatio)
+		halfColliderWidth, halfColliderHeight := player.ColliderRadius, player.ColliderRadius+player.ColliderRadius // avoid multiplying
+		playerCollider.X, playerCollider.Y = VirtualGridToPolygonColliderBLPos(newVx, newVy, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY, pR.VirtualGridToWorldRatio)
 		// Update in the collision system
 		playerCollider.Update()

@@ -1423,8 +1417,7 @@ func (pR *Room) applyInputFrameDownsyncDynamicsOnSingleRenderFrame(delayedInputF
 			}
 			offenderWx, offenderWy := VirtualGridToWorldPos(offender.VirtualGridX, offender.VirtualGridY, pR.VirtualGridToWorldRatio)
 			bulletWx, bulletWy := offenderWx+xfac*meleeBullet.HitboxOffset, offenderWy
-
-			newBulletCollider := GenerateRectCollider(bulletWx, bulletWy, meleeBullet.HitboxSize.X, meleeBullet.HitboxSize.Y, 0, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY, "MeleeBullet")
+			newBulletCollider := GenerateRectCollider(bulletWx, bulletWy, meleeBullet.HitboxSize.X, meleeBullet.HitboxSize.Y, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY, "MeleeBullet")
 			newBulletCollider.Data = meleeBullet
 			pR.Space.Add(newBulletCollider)
 			collisionSysMap[collisionBulletIndex] = newBulletCollider
@@ -1444,65 +1437,65 @@ func (pR *Room) applyInputFrameDownsyncDynamicsOnSingleRenderFrame(delayedInputF
 		playerCollider := collisionSysMap[collisionPlayerIndex]
 		playerShape := playerCollider.Shape.(*resolv.ConvexPolygon)
 		hardPushbackNorms[joinIndex-1] = pR.calcHardPushbacksNorms(playerCollider, playerShape, pR.SnapIntoPlatformOverlap, &(effPushbacks[joinIndex-1]))
-		if 0 < len(hardPushbackNorms[joinIndex-1]) {
-			Logger.Debug(fmt.Sprintf("playerId=%d, joinIndex=%d got %d non-empty hardPushbacks at renderFrame.id=%d", playerId, joinIndex, len(hardPushbackNorms), currRenderFrame.Id))
-		}
 		currPlayerDownsync, thatPlayerInNextFrame := currRenderFrame.Players[playerId], nextRenderFramePlayers[playerId]
 		fallStopping := false
 		possiblyFallStoppedOnAnotherPlayer := false
-		collision := playerCollider.Check(0, 0)
-		if nil == collision {
-			continue
-		}
-		for _, obj := range collision.Objects {
-			isBarrier, isAnotherPlayer, isBullet := false, false, false
-			switch obj.Data.(type) {
-			case *Barrier:
-				isBarrier = true
-			case *Player:
-				isAnotherPlayer = true
-			case *MeleeBullet:
-				isBullet = true
-			}
-			if isBullet {
-				// ignore bullets for this step
-				continue
-			}
-			bShape := obj.Shape.(*resolv.ConvexPolygon)
-			overlapped, pushbackX, pushbackY, overlapResult := CalcPushbacks(0, 0, playerShape, bShape)
-			if !overlapped {
-				continue
-			}
-			normAlignmentWithGravity := (overlapResult.OverlapX*float64(0) + overlapResult.OverlapY*float64(-1.0))
-			landedOnGravityPushback := (pR.SnapIntoPlatformThreshold < normAlignmentWithGravity) // prevents false snapping on the lateral sides
-			if landedOnGravityPushback {
-				// kindly note that one player might land on top of another player, and snapping is also required in such case
-				pushbackX, pushbackY = (overlapResult.Overlap-pR.SnapIntoPlatformOverlap)*overlapResult.OverlapX, (overlapResult.Overlap-pR.SnapIntoPlatformOverlap)*overlapResult.OverlapY
-				thatPlayerInNextFrame.InAir = false
-			}
-			for _, hardPushbackNorm := range hardPushbackNorms[joinIndex-1] {
-				projectedMagnitude := pushbackX*hardPushbackNorm.X + pushbackY*hardPushbackNorm.Y
-				if isBarrier || (isAnotherPlayer && 0 > projectedMagnitude) {
-					pushbackX -= projectedMagnitude * hardPushbackNorm.X
-					pushbackY -= projectedMagnitude * hardPushbackNorm.Y
+		if collision := playerCollider.Check(0, 0); nil != collision {
+			for _, obj := range collision.Objects {
+				isBarrier, isAnotherPlayer, isBullet := false, false, false
+				switch obj.Data.(type) {
+				case *Barrier:
+					isBarrier = true
+				case *Player:
+					isAnotherPlayer = true
+				case *MeleeBullet:
+					isBullet = true
+				}
+				if isBullet {
+					// ignore bullets for this step
+					continue
+				}
+				bShape := obj.Shape.(*resolv.ConvexPolygon)
+				overlapped, pushbackX, pushbackY, overlapResult := CalcPushbacks(0, 0, playerShape, bShape)
+				if !overlapped {
+					continue
+				}
+				normAlignmentWithGravity := (overlapResult.OverlapX*float64(0) + overlapResult.OverlapY*float64(-1.0))
+				landedOnGravityPushback := (pR.SnapIntoPlatformThreshold < normAlignmentWithGravity) // prevents false snapping on the lateral sides
+				if landedOnGravityPushback {
+					// kindly note that one player might land on top of another player, and snapping is also required in such case
+					pushbackX, pushbackY = (overlapResult.Overlap-pR.SnapIntoPlatformOverlap)*overlapResult.OverlapX, (overlapResult.Overlap-pR.SnapIntoPlatformOverlap)*overlapResult.OverlapY
+					thatPlayerInNextFrame.InAir = false
 				}
-			}
-			effPushbacks[joinIndex-1].X += pushbackX
-			effPushbacks[joinIndex-1].Y += pushbackY
-			if currPlayerDownsync.InAir && landedOnGravityPushback {
-				fallStopping = true
 				if isAnotherPlayer {
-					possiblyFallStoppedOnAnotherPlayer = true
+					// [WARNING] See comments of this substep in frontend.
+					pushbackX, pushbackY = (overlapResult.Overlap-pR.SnapIntoPlatformOverlap*2)*overlapResult.OverlapX, (overlapResult.Overlap-pR.SnapIntoPlatformOverlap*2)*overlapResult.OverlapY
 				}
-				if 1 == thatPlayerInNextFrame.JoinIndex {
-					Logger.Info(fmt.Sprintf("playerId=%d, joinIndex=%d fallStopping#1 at {renderFrame.id: %d, virtualX: %d, virtualY: %d, velX: %d, velY: %d} with effPushback={%.3f, %.3f}, overlapMag=%.4f, possiblyFallStoppedOnAnotherPlayer=%v", playerId, joinIndex, currRenderFrame.Id, currPlayerDownsync.VirtualGridX, currPlayerDownsync.VirtualGridY, currPlayerDownsync.VelX, currPlayerDownsync.VelY, effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y, overlapResult.Overlap, possiblyFallStoppedOnAnotherPlayer))
+				for _, hardPushbackNorm := range hardPushbackNorms[joinIndex-1] {
+					projectedMagnitude := pushbackX*hardPushbackNorm.X + pushbackY*hardPushbackNorm.Y
+					if isBarrier || (isAnotherPlayer && 0 > projectedMagnitude) {
+						pushbackX -= projectedMagnitude * hardPushbackNorm.X
+						pushbackY -= projectedMagnitude * hardPushbackNorm.Y
+					}
+				}
+				effPushbacks[joinIndex-1].X += pushbackX
+				effPushbacks[joinIndex-1].Y += pushbackY
+				if currPlayerDownsync.InAir && landedOnGravityPushback {
+					fallStopping = true
+					if isAnotherPlayer {
+						possiblyFallStoppedOnAnotherPlayer = true
+					}
+				}
+				if 1 == joinIndex {
+					halfColliderWidth, halfColliderHeight := player.ColliderRadius, player.ColliderRadius+player.ColliderRadius // avoid multiplying
+					if fallStopping {
+						Logger.Info(fmt.Sprintf("playerId=%d, joinIndex=%d fallStopping#1\n{renderFrame.id: %d, possiblyFallStoppedOnAnotherPlayer: %v}\nplayerColliderPos=%v, effPushback={%.3f, %.3f}, overlapMag=%.4f", playerId, joinIndex, currRenderFrame.Id, possiblyFallStoppedOnAnotherPlayer, RectCenterStr(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY), effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y, overlapResult.Overlap))
+					} else if currPlayerDownsync.InAir && isBarrier && !landedOnGravityPushback {
+						Logger.Warn(fmt.Sprintf("playerId=%d, joinIndex=%d inAir & pushed back by barrier & not landed at {renderFrame.id: %d}\nplayerColliderPos=%v, effPushback={%.3f, %.3f}, overlapMag=%.4f, len(hardPushbackNorms)=%d", playerId, joinIndex, currRenderFrame.Id, RectCenterStr(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY), effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y, overlapResult.Overlap, len(hardPushbackNorms)))
+					} else if currPlayerDownsync.InAir && isAnotherPlayer {
+						//Logger.Warn(fmt.Sprintf("playerId=%d, joinIndex=%d inAir & pushed back by another player\n{renderFrame.id: %d}\nplayerColliderPos=%v, anotherPlayerColliderPos=%v, effPushback={%.3f, %.3f}, landedOnGravityPushback=%v, fallStopping=%v, overlapMag=%.4f, len(hardPushbackNorms)=%d", playerId, joinIndex, currRenderFrame.Id, RectCenterStr(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY), RectCenterStr(obj, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY), effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y, landedOnGravityPushback, fallStopping, overlapResult.Overlap, len(hardPushbackNorms)))
+					}
 				}
-			}
-			if 1 == joinIndex && currPlayerDownsync.InAir && isBarrier && !landedOnGravityPushback {
-				Logger.Warn(fmt.Sprintf("playerId=%d, joinIndex=%d inAir & pushed back by barrier & not landed at {renderFrame.id: %d, virtualX: %d, virtualY: %d, velX: %d, velY: %d} with effPushback={%.3f, %.3f}, playerColliderPos={%.3f, %.3f}, barrierPos={%.3f, %.3f}, overlapMag=%.4f, len(hardPushbackNorms)=%d", playerId, joinIndex, currRenderFrame.Id, currPlayerDownsync.VirtualGridX, currPlayerDownsync.VirtualGridY, currPlayerDownsync.VelX, currPlayerDownsync.VelY, effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y, playerCollider.X-pR.collisionSpaceOffsetX, playerCollider.Y-pR.collisionSpaceOffsetY, bShape.X-pR.collisionSpaceOffsetX, bShape.Y-pR.collisionSpaceOffsetY, overlapResult.Overlap, len(hardPushbackNorms)))
-			}
-			if 1 == joinIndex && currPlayerDownsync.InAir && isAnotherPlayer {
-				Logger.Warn(fmt.Sprintf("playerId=%d, joinIndex=%d inAir & pushed back by another player at {renderFrame.id: %d, virtualX: %d, virtualY: %d, velX: %d, velY: %d} with effPushback={%.3f, %.3f}, landedOnGravityPushback=%v, fallStopping=%v, playerColliderPos={%.3f, %.3f}, anotherPlayerColliderPos={%.3f, %.3f}, overlapMag=%.4f, len(hardPushbackNorms)=%d", playerId, joinIndex, currRenderFrame.Id, currPlayerDownsync.VirtualGridX, currPlayerDownsync.VirtualGridY, currPlayerDownsync.VelX, currPlayerDownsync.VelY, effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y, landedOnGravityPushback, fallStopping, playerCollider.X-pR.collisionSpaceOffsetX, playerCollider.Y-pR.collisionSpaceOffsetY, bShape.X-pR.collisionSpaceOffsetX, bShape.Y-pR.collisionSpaceOffsetY, overlapResult.Overlap, len(hardPushbackNorms)))
 			}
 		}
 		if fallStopping {
@@ -1512,15 +1505,14 @@ func (pR *Room) applyInputFrameDownsyncDynamicsOnSingleRenderFrame(delayedInputF
 			thatPlayerInNextFrame.FramesToRecover = 0
 		}
 		if currPlayerDownsync.InAir {
-			switch thatPlayerInNextFrame.CharacterState {
-			case ATK_CHARACTER_STATE_IDLE1:
-			case ATK_CHARACTER_STATE_WALKING:
+			oldNextCharacterState := thatPlayerInNextFrame.CharacterState
+			switch oldNextCharacterState {
+			case ATK_CHARACTER_STATE_IDLE1, ATK_CHARACTER_STATE_WALKING:
 				thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_INAIR_IDLE1
 			case ATK_CHARACTER_STATE_ATK1:
 				thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_INAIR_ATK1
 			case ATK_CHARACTER_STATE_ATKED1:
 				thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_INAIR_ATKED1
-			default:
 			}
 		}
 	}
@@ -1599,21 +1591,18 @@ func (pR *Room) applyInputFrameDownsyncDynamicsOnSingleRenderFrame(delayedInputF
 		playerId := player.Id
 		collisionPlayerIndex := COLLISION_PLAYER_INDEX_PREFIX + joinIndex
 		playerCollider := collisionSysMap[collisionPlayerIndex]
-		playerShape := playerCollider.Shape.(*resolv.ConvexPolygon)
 		// Update "virtual grid position"
 		currPlayerDownsync, thatPlayerInNextFrame := currRenderFrame.Players[playerId], nextRenderFramePlayers[playerId]
-		colliderWidth, colliderHeight := player.ColliderRadius*2, player.ColliderRadius*4
-		thatPlayerInNextFrame.VirtualGridX, thatPlayerInNextFrame.VirtualGridY = PolygonColliderBLToVirtualGridPos(playerCollider.X-effPushbacks[joinIndex-1].X, playerCollider.Y-effPushbacks[joinIndex-1].Y, colliderWidth*0.5, colliderHeight*0.5, pR.SnapIntoPlatformOverlap, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY, pR.WorldToVirtualGridRatio)
+		halfColliderWidth, halfColliderHeight := player.ColliderRadius, player.ColliderRadius+player.ColliderRadius // avoid multiplying
+		thatPlayerInNextFrame.VirtualGridX, thatPlayerInNextFrame.VirtualGridY = PolygonColliderBLToVirtualGridPos(playerCollider.X-effPushbacks[joinIndex-1].X, playerCollider.Y-effPushbacks[joinIndex-1].Y, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY, pR.WorldToVirtualGridRatio)

 		if 1 == thatPlayerInNextFrame.JoinIndex {
-			if thatPlayerInNextFrame.InAir && (0 != thatPlayerInNextFrame.VelY) {
-				// Logger.Info(fmt.Sprintf("playerId=%d, joinIndex=%d inAir trajectory: {nextRenderFrame.id: %d, nextVirtualX: %d, nextVirtualY: %d, nextVelX: %d, nextVelY: %d}, with playerColliderPos={%.3f, %.3f}, effPushback={%.3f, %.3f}", playerId, joinIndex, currRenderFrame.Id+1, thatPlayerInNextFrame.VirtualGridX, thatPlayerInNextFrame.VirtualGridY, thatPlayerInNextFrame.VelX, thatPlayerInNextFrame.VelY, playerShape.X-pR.collisionSpaceOffsetX, playerShape.Y-pR.collisionSpaceOffsetY, effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y))
-			}
 			if currPlayerDownsync.InAir && !thatPlayerInNextFrame.InAir {
-				Logger.Warn(fmt.Sprintf("playerId=%d, joinIndex=%d fallStopping#2 at {nextRenderFrame.id: %d, nextVirtualX: %d, nextVirtualY: %d, nextVelX: %d, nextVelY: %d}, with playerColliderPos={%.3f, %.3f}, effPushback={%.3f, %.3f}", playerId, joinIndex, currRenderFrame.Id+1, thatPlayerInNextFrame.VirtualGridX, thatPlayerInNextFrame.VirtualGridY, thatPlayerInNextFrame.VelX, thatPlayerInNextFrame.VelY, playerShape.X-pR.collisionSpaceOffsetX, playerShape.Y-pR.collisionSpaceOffsetY, effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y))
-			}
-			if !currPlayerDownsync.InAir && thatPlayerInNextFrame.InAir {
-				Logger.Warn(fmt.Sprintf("playerId=%d, joinIndex=%d took off at {nextRenderFrame.id: %d, nextVirtualX: %d, nextVirtualY: %d, nextVelX: %d, nextVelY: %d}, with playerColliderPos={%.3f, %.3f}, effPushback={%.3f, %.3f}", playerId, joinIndex, currRenderFrame.Id+1, thatPlayerInNextFrame.VirtualGridX, thatPlayerInNextFrame.VirtualGridY, thatPlayerInNextFrame.VelX, thatPlayerInNextFrame.VelY, playerShape.X-pR.collisionSpaceOffsetX, playerShape.Y-pR.collisionSpaceOffsetY, effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y))
+				Logger.Warn(fmt.Sprintf("playerId=%d, joinIndex=%d fallStopping#2:\n{nextRenderFrame.id: %d, nextVirtualX: %d, nextVirtualY: %d, nextVelX: %d, nextVelY: %d}\n\tcalculated from <- playerColliderPos=%v, effPushback={%.3f, %.3f}", playerId, joinIndex, currRenderFrame.Id+1, thatPlayerInNextFrame.VirtualGridX, thatPlayerInNextFrame.VirtualGridY, thatPlayerInNextFrame.VelX, thatPlayerInNextFrame.VelY, RectCenterStr(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY), effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y))
+			} else if !currPlayerDownsync.InAir && thatPlayerInNextFrame.InAir {
+				Logger.Warn(fmt.Sprintf("playerId=%d, joinIndex=%d took off:\n{nextRenderFrame.id: %d, nextVirtualX: %d, nextVirtualY: %d, nextVelX: %d, nextVelY: %d}\n\tcalculated from <- playerColliderPos=%v, effPushback={%.3f, %.3f}", playerId, joinIndex, currRenderFrame.Id+1, thatPlayerInNextFrame.VirtualGridX, thatPlayerInNextFrame.VirtualGridY, thatPlayerInNextFrame.VelX, thatPlayerInNextFrame.VelY, RectCenterStr(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY), effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y))
+			} else if thatPlayerInNextFrame.InAir && (0 != thatPlayerInNextFrame.VelY) {
+				//Logger.Info(fmt.Sprintf("playerId=%d, joinIndex=%d inAir trajectory:\n{nextRenderFrame.id: %d, nextVirtualX: %d, nextVirtualY: %d, nextVelX: %d, nextVelY: %d}\n\tcalculated from <- playerColliderPos=%v, effPushback={%.3f, %.3f}", playerId, joinIndex, currRenderFrame.Id+1, thatPlayerInNextFrame.VirtualGridX, thatPlayerInNextFrame.VirtualGridY, thatPlayerInNextFrame.VelX, thatPlayerInNextFrame.VelY, RectCenterStr(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY), effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y))
 			}
 		}
 	}
@@ -1645,12 +1634,14 @@ func (pR *Room) inputFrameIdDebuggable(inputFrameId int32) bool {
 func (pR *Room) refreshColliders(spaceW, spaceH int32) {
 	// Kindly note that by now, we've already got all the shapes in the tmx file into "pR.(Players | Barriers)" from "ParseTmxLayersAndGroups"

-	minStep := (int(float64(pR.PlayerDefaultSpeed)*pR.VirtualGridToWorldRatio) << 1) // the approx minimum distance a player can move per frame in world coordinate
+	topPadding, bottomPadding, leftPadding, rightPadding := pR.SnapIntoPlatformOverlap, pR.SnapIntoPlatformOverlap, pR.SnapIntoPlatformOverlap, pR.SnapIntoPlatformOverlap
+
+	minStep := (int(float64(pR.PlayerDefaultSpeed)*pR.VirtualGridToWorldRatio) << 2) // the approx minimum distance a player can move per frame in world coordinate
 	pR.Space = resolv.NewSpace(int(spaceW), int(spaceH), minStep, minStep)           // allocate a new collision space everytime after a battle is settled
 	for _, player := range pR.Players {
 		wx, wy := VirtualGridToWorldPos(player.VirtualGridX, player.VirtualGridY, pR.VirtualGridToWorldRatio)
 		colliderWidth, colliderHeight := player.ColliderRadius*2, player.ColliderRadius*4
-		playerCollider := GenerateRectCollider(wx, wy, colliderWidth, colliderHeight, pR.SnapIntoPlatformOverlap, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY, "Player") // the coords of all barrier boundaries are multiples of tileWidth(i.e. 16), by adding snapping y-padding when "landedOnGravityPushback" all "playerCollider.Y" would be a multiple of 1.0
+		playerCollider := GenerateRectCollider(wx, wy, colliderWidth, colliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY, "Player") // the coords of all barrier boundaries are multiples of tileWidth(i.e. 16), by adding snapping y-padding when "landedOnGravityPushback" all "playerCollider.Y" would be a multiple of 1.0
 		playerCollider.Data = player
 		pR.Space.Add(playerCollider)
 		// Keep track of the collider in "pR.CollisionSysMap"
@@ -1726,30 +1717,41 @@ func (pR *Room) downsyncToAllPlayers(inputsBufferSnapshot *InputsBufferSnapshot)

 		       The difference from our current approach is that the "pR.PlayerDownsyncChanDict[playerId]" in use is a Golang channel, i.e. when executing #4 it automatically executes #3 (before) & #7 (after) as well, thus we couldn't do #5 & #6 in between.
 	*/
-	for playerId, playerDownsyncChan := range pR.PlayerDownsyncChanDict {
+	if true == pR.BackendDynamicsEnabled {
+		for _, player := range pR.PlayersArr {
+			/*
+			   [WARNING] Since v0.9.1, the inconsistence between frontend & backend collision handling results became too difficult to track, therefore before we can let frontend use a Golang compiled library for "applyInputFrameDownsyncDynamicsOnSingleRenderFrame", it's a compromise here to force resync for all players in a same room if any player recovered from a reconnection (when it's most likely for anyone to notice an inconsistence).
+
+			   That said, we ensured that if "false == BackendDynamicsEnabled" and noone ever disconnects & reconnects, the frontend collision handling results are always consistent.
+			*/
+			playerBattleState := atomic.LoadInt32(&(player.BattleState))
+			if PlayerBattleStateIns.READDED_BATTLE_COLLIDER_ACKED == playerBattleState {
+				inputsBufferSnapshot.ShouldForceResync = true
+				break
+			}
+		}
+	}
+
+	for _, player := range pR.PlayersArr {
 		/*
 		   [WARNING] While the order of generation of "inputsBufferSnapshot" is preserved for sending, the underlying network I/O blocking action is dispatched to "downsyncLoop of each player" such that "markConfirmationIfApplicable & forceConfirmationIfApplicable" can re-hold "pR.InputsBufferLock" asap and proceed with more inputFrameUpsyncs.

 		   The use of "downsyncLoop of each player" also waives the need of guarding each "pR.PlayerDownsyncSessionDict[playerId]" from multithread-access (e.g. by a "pR.PlayerDownsyncSessionMutexDict[playerId]"), i.e. Gorilla v1.2.0 "conn.WriteMessage" isn't thread-safe https://github.com/gorilla/websocket/blob/v1.2.0/conn.go#L585.
 		*/
-		if player, existent := pR.Players[playerId]; existent {
-			playerBattleState := atomic.LoadInt32(&(player.BattleState))
-			switch playerBattleState {
-			case PlayerBattleStateIns.DISCONNECTED:
-			case PlayerBattleStateIns.LOST:
-			case PlayerBattleStateIns.EXPELLED_DURING_GAME:
-			case PlayerBattleStateIns.EXPELLED_IN_DISMISSAL:
-			case PlayerBattleStateIns.ADDED_PENDING_BATTLE_COLLIDER_ACK:
-			case PlayerBattleStateIns.READDED_PENDING_BATTLE_COLLIDER_ACK:
-				continue
-			}
+		playerBattleState := atomic.LoadInt32(&(player.BattleState))
+		switch playerBattleState {
+		case PlayerBattleStateIns.DISCONNECTED, PlayerBattleStateIns.LOST, PlayerBattleStateIns.EXPELLED_DURING_GAME, PlayerBattleStateIns.EXPELLED_IN_DISMISSAL, PlayerBattleStateIns.ADDED_PENDING_BATTLE_COLLIDER_ACK, PlayerBattleStateIns.READDED_PENDING_BATTLE_COLLIDER_ACK:
+			continue
+		}
+
+		if playerDownsyncChan, existent := pR.PlayerDownsyncChanDict[player.Id]; existent {
 			playerDownsyncChan <- (*inputsBufferSnapshot)
 			// Logger.Info(fmt.Sprintf("Sent inputsBufferSnapshot(refRenderFrameId:%d, unconfirmedMask:%v) to for (roomId: %d, playerId:%d, playerDownsyncChan:%p)#1", inputsBufferSnapshot.RefRenderFrameId, inputsBufferSnapshot.UnconfirmedMask, pR.Id, playerId, playerDownsyncChan))
 		}
 	}
 }

-func (pR *Room) downsyncToSinglePlayer(playerId int32, player *Player, refRenderFrameId int32, unconfirmedMask uint64, toSendInputFrameDownsyncsSnapshot []*InputFrameDownsync) {
+func (pR *Room) downsyncToSinglePlayer(playerId int32, player *Player, refRenderFrameId int32, unconfirmedMask uint64, toSendInputFrameDownsyncsSnapshot []*InputFrameDownsync, shouldForceResync bool) {
 	/*
 	   [WARNING] This function MUST BE called while "pR.InputsBufferLock" is unlocked -- otherwise the network I/O blocking of "sendSafely" might cause significant lag for "markConfirmationIfApplicable & forceConfirmationIfApplicable"!

@@ -1759,33 +1761,22 @@ func (pR *Room) downsyncToSinglePlayer(playerId int32, player *Player, refRender
 	playerJoinIndex := player.JoinIndex - 1
 	playerBattleState := atomic.LoadInt32(&(player.BattleState))
 	switch playerBattleState {
-	case PlayerBattleStateIns.DISCONNECTED:
-	case PlayerBattleStateIns.LOST:
-	case PlayerBattleStateIns.EXPELLED_DURING_GAME:
-	case PlayerBattleStateIns.EXPELLED_IN_DISMISSAL:
-	case PlayerBattleStateIns.ADDED_PENDING_BATTLE_COLLIDER_ACK:
-	case PlayerBattleStateIns.READDED_PENDING_BATTLE_COLLIDER_ACK:
+	case PlayerBattleStateIns.DISCONNECTED, PlayerBattleStateIns.LOST, PlayerBattleStateIns.EXPELLED_DURING_GAME, PlayerBattleStateIns.EXPELLED_IN_DISMISSAL, PlayerBattleStateIns.ADDED_PENDING_BATTLE_COLLIDER_ACK, PlayerBattleStateIns.READDED_PENDING_BATTLE_COLLIDER_ACK:
 		return
 	}

 	shouldResync1 := (PlayerBattleStateIns.READDED_BATTLE_COLLIDER_ACKED == playerBattleState) // i.e. implies that "MAGIC_LAST_SENT_INPUT_FRAME_ID_READDED == player.LastSentInputFrameId"
 	shouldResync2 := (0 < (unconfirmedMask & uint64(1<<uint32(playerJoinIndex))))              // This condition is critical, if we don't send resync upon this condition, the "reconnected or slowly-clocking player" might never get its input synced
 	// shouldResync2 := (0 < unconfirmedMask) // An easier version of the above, might keep sending "refRenderFrame"s to still connected players when any player is disconnected
-	shouldResyncOverall := (shouldResync1 || shouldResync2)
-
-	if shouldResyncOverall {
-		// A rejoined player, should guarantee that when it resyncs to "refRenderFrameId" a matching inputFrame to apply exists
-		Logger.Debug(fmt.Sprintf("Resyncing player: roomId=%v, playerId=%v, playerJoinIndex=%v, renderFrameId=%v, curDynamicsRenderFrameId=%v, playerLastSentInputFrameId=%v, refRenderFrameId=%v", pR.Id, playerId, player.JoinIndex, pR.RenderFrameId, pR.CurDynamicsRenderFrameId, player.LastSentInputFrameId, refRenderFrameId))
-	}
+	shouldResync3 := shouldForceResync
+	shouldResyncOverall := (shouldResync1 || shouldResync2 || shouldResync3)

 	/*
 	   Resync helps
 	   1. when player with a slower frontend clock lags significantly behind and thus wouldn't get its inputUpsync recognized due to faster "forceConfirmation"
 	   2. reconnection
 	*/
-
-	//toSendInputFrameIdSt, toSendInputFrameIdEd := toSendInputFrameDownsyncsSnapshot[0].InputFrameId, toSendInputFrameDownsyncsSnapshot[len(toSendInputFrameDownsyncsSnapshot)-1].InputFrameId+1
-	_, toSendInputFrameIdEd := toSendInputFrameDownsyncsSnapshot[0].InputFrameId, toSendInputFrameDownsyncsSnapshot[len(toSendInputFrameDownsyncsSnapshot)-1].InputFrameId+1
+	toSendInputFrameIdSt, toSendInputFrameIdEd := toSendInputFrameDownsyncsSnapshot[0].InputFrameId, toSendInputFrameDownsyncsSnapshot[len(toSendInputFrameDownsyncsSnapshot)-1].InputFrameId+1
 	if pR.BackendDynamicsEnabled && shouldResyncOverall {
 		tmp := pR.RenderFrameBuffer.GetByFrameId(refRenderFrameId)
 		if nil == tmp {
@@ -1796,9 +1787,13 @@ func (pR *Room) downsyncToSinglePlayer(playerId int32, player *Player, refRender
 		for _, player := range pR.PlayersArr {
 			refRenderFrame.Players[player.Id].ColliderRadius = player.ColliderRadius // hardcoded for now
 		}
+		if shouldResync3 {
+			refRenderFrame.ShouldForceResync = true
+		}
 		refRenderFrame.BackendUnconfirmedMask = unconfirmedMask
 		pR.sendSafely(refRenderFrame, toSendInputFrameDownsyncsSnapshot, DOWNSYNC_MSG_ACT_FORCED_RESYNC, playerId, false)
-		// Logger.Warn(fmt.Sprintf("Sent refRenderFrameId=%v & inputFrameIds [%d, %d), for roomId=%v, playerId=%d, playerJoinIndex=%d, renderFrameId=%d, curDynamicsRenderFrameId=%d, playerLastSentInputFrameId=%d: InputsBuffer=%v", refRenderFrameId, toSendInputFrameIdSt, toSendInputFrameIdEd, pR.Id, playerId, player.JoinIndex, pR.RenderFrameId, pR.CurDynamicsRenderFrameId, player.LastSentInputFrameId, pR.InputsBufferString(false)))
+		//Logger.Warn(fmt.Sprintf("Sent refRenderFrameId=%v & inputFrameIds [%d, %d), for roomId=%v, playerId=%d, playerJoinIndex=%d, renderFrameId=%d, curDynamicsRenderFrameId=%d, playerLastSentInputFrameId=%d: InputsBuffer=%v", refRenderFrameId, toSendInputFrameIdSt, toSendInputFrameIdEd, pR.Id, playerId, player.JoinIndex, pR.RenderFrameId, pR.CurDynamicsRenderFrameId, player.LastSentInputFrameId, pR.InputsBufferString(false)))
+		Logger.Warn(fmt.Sprintf("Sent refRenderFrameId=%v & inputFrameIds [%d, %d), for roomId=%v, playerId=%d, playerJoinIndex=%d, renderFrameId=%d, curDynamicsRenderFrameId=%d, playerLastSentInputFrameId=%d", refRenderFrameId, toSendInputFrameIdSt, toSendInputFrameIdEd, pR.Id, playerId, player.JoinIndex, pR.RenderFrameId, pR.CurDynamicsRenderFrameId, player.LastSentInputFrameId))
 	} else {
 		pR.sendSafely(nil, toSendInputFrameDownsyncsSnapshot, DOWNSYNC_MSG_ACT_INPUT_BATCH, playerId, false)
 	}
--- a/battle_srv/protos/room_downsync_frame.pb.go
+++ b/battle_srv/protos/room_downsync_frame.pb.go
@@ -670,6 +670,7 @@ type InputsBufferSnapshot struct {
 	RefRenderFrameId          int32                 `protobuf:"varint,1,opt,name=refRenderFrameId,proto3" json:"refRenderFrameId,omitempty"`
 	UnconfirmedMask           uint64                `protobuf:"varint,2,opt,name=unconfirmedMask,proto3" json:"unconfirmedMask,omitempty"`
 	ToSendInputFrameDownsyncs []*InputFrameDownsync `protobuf:"bytes,3,rep,name=toSendInputFrameDownsyncs,proto3" json:"toSendInputFrameDownsyncs,omitempty"`
+	ShouldForceResync         bool                  `protobuf:"varint,4,opt,name=shouldForceResync,proto3" json:"shouldForceResync,omitempty"`
 }

 func (x *InputsBufferSnapshot) Reset() {
@@ -725,6 +726,13 @@ func (x *InputsBufferSnapshot) GetToSendInputFrameDownsyncs() []*InputFrameDowns
 	return nil
 }

+func (x *InputsBufferSnapshot) GetShouldForceResync() bool {
+	if x != nil {
+		return x.ShouldForceResync
+	}
+	return false
+}
+
 type MeleeBullet struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1199,6 +1207,7 @@ type RoomDownsyncFrame struct {
 	CountdownNanos         int64                     `protobuf:"varint,3,opt,name=countdownNanos,proto3" json:"countdownNanos,omitempty"`
 	MeleeBullets           []*MeleeBullet            `protobuf:"bytes,4,rep,name=meleeBullets,proto3" json:"meleeBullets,omitempty"`                      // I don't know how to mimic inheritance/composition in protobuf by far, thus using an array for each type of bullet as a compromise
 	BackendUnconfirmedMask uint64                    `protobuf:"varint,5,opt,name=backendUnconfirmedMask,proto3" json:"backendUnconfirmedMask,omitempty"` // Indexed by "joinIndex", same compression concern as stated in InputFrameDownsync
+	ShouldForceResync      bool                      `protobuf:"varint,6,opt,name=shouldForceResync,proto3" json:"shouldForceResync,omitempty"`
 }

 func (x *RoomDownsyncFrame) Reset() {
@@ -1268,6 +1277,13 @@ func (x *RoomDownsyncFrame) GetBackendUnconfirmedMask() uint64 {
 	return 0
 }

+func (x *RoomDownsyncFrame) GetShouldForceResync() bool {
+	if x != nil {
+		return x.ShouldForceResync
+	}
+	return false
+}
+
 var File_room_downsync_frame_proto protoreflect.FileDescriptor

 var file_room_downsync_frame_proto_rawDesc = []byte{
@@ -1373,7 +1389,7 @@ var file_room_downsync_frame_proto_rawDesc = []byte{
 	0x74, 0x63, 0x68, 0x12, 0x36, 0x0a, 0x08, 0x62, 0x63, 0x69, 0x46, 0x72, 0x61, 0x6d, 0x65, 0x18,
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@@ -1386,196 +1402,201 @@ var file_room_downsync_frame_proto_rawDesc = []byte{
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+	0x64, 0x6f, 0x77, 0x6e, 0x4e, 0x61, 0x6e, 0x6f, 0x73, 0x18, 0x03, 0x20, 0x01, 0x28, 0x03, 0x52,
+	0x0e, 0x63, 0x6f, 0x75, 0x6e, 0x74, 0x64, 0x6f, 0x77, 0x6e, 0x4e, 0x61, 0x6e, 0x6f, 0x73, 0x12,
+	0x37, 0x0a, 0x0c, 0x6d, 0x65, 0x6c, 0x65, 0x65, 0x42, 0x75, 0x6c, 0x6c, 0x65, 0x74, 0x73, 0x18,
+	0x04, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x13, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x73, 0x2e, 0x4d,
+	0x65, 0x6c, 0x65, 0x65, 0x42, 0x75, 0x6c, 0x6c, 0x65, 0x74, 0x52, 0x0c, 0x6d, 0x65, 0x6c, 0x65,
+	0x65, 0x42, 0x75, 0x6c, 0x6c, 0x65, 0x74, 0x73, 0x12, 0x36, 0x0a, 0x16, 0x62, 0x61, 0x63, 0x6b,
 	0x65, 0x6e, 0x64, 0x55, 0x6e, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x72, 0x6d, 0x65, 0x64, 0x4d, 0x61,
-	0x73, 0x6b, 0x1a, 0x52, 0x0a, 0x0c, 0x50, 0x6c, 0x61, 0x79, 0x65, 0x72, 0x73, 0x45, 0x6e, 0x74,
-	0x72, 0x79, 0x12, 0x10, 0x0a, 0x03, 0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x05, 0x52,
-	0x03, 0x6b, 0x65, 0x79, 0x12, 0x2c, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x02, 0x20,
-	0x01, 0x28, 0x0b, 0x32, 0x16, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x73, 0x2e, 0x50, 0x6c, 0x61,
-	0x79, 0x65, 0x72, 0x44, 0x6f, 0x77, 0x6e, 0x73, 0x79, 0x6e, 0x63, 0x52, 0x05, 0x76, 0x61, 0x6c,
-	0x75, 0x65, 0x3a, 0x02, 0x38, 0x01, 0x42, 0x13, 0x5a, 0x11, 0x62, 0x61, 0x74, 0x74, 0x6c, 0x65,
-	0x5f, 0x73, 0x72, 0x76, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f,
-	0x74, 0x6f, 0x33,
+	0x73, 0x6b, 0x18, 0x05, 0x20, 0x01, 0x28, 0x04, 0x52, 0x16, 0x62, 0x61, 0x63, 0x6b, 0x65, 0x6e,
+	0x64, 0x55, 0x6e, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x72, 0x6d, 0x65, 0x64, 0x4d, 0x61, 0x73, 0x6b,
+	0x12, 0x2c, 0x0a, 0x11, 0x73, 0x68, 0x6f, 0x75, 0x6c, 0x64, 0x46, 0x6f, 0x72, 0x63, 0x65, 0x52,
+	0x65, 0x73, 0x79, 0x6e, 0x63, 0x18, 0x06, 0x20, 0x01, 0x28, 0x08, 0x52, 0x11, 0x73, 0x68, 0x6f,
+	0x75, 0x6c, 0x64, 0x46, 0x6f, 0x72, 0x63, 0x65, 0x52, 0x65, 0x73, 0x79, 0x6e, 0x63, 0x1a, 0x52,
+	0x0a, 0x0c, 0x50, 0x6c, 0x61, 0x79, 0x65, 0x72, 0x73, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12, 0x10,
+	0x0a, 0x03, 0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x05, 0x52, 0x03, 0x6b, 0x65, 0x79,
+	0x12, 0x2c, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0b, 0x32,
+	0x16, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x73, 0x2e, 0x50, 0x6c, 0x61, 0x79, 0x65, 0x72, 0x44,
+	0x6f, 0x77, 0x6e, 0x73, 0x79, 0x6e, 0x63, 0x52, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x3a, 0x02,
+	0x38, 0x01, 0x42, 0x13, 0x5a, 0x11, 0x62, 0x61, 0x74, 0x74, 0x6c, 0x65, 0x5f, 0x73, 0x72, 0x76,
+	0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }

 var (
--- a/collider_visualizer/worldColliderDisplay.go
+++ b/collider_visualizer/worldColliderDisplay.go
@@ -37,14 +37,15 @@ func NewWorldColliderDisplay(game *Game, stageDiscreteW, stageDiscreteH, stageTi
 	worldToVirtualGridRatio := float64(1000)
 	virtualGridToWorldRatio := float64(1) / worldToVirtualGridRatio
 	playerDefaultSpeed := 1 * worldToVirtualGridRatio
-	minStep := (int(float64(playerDefaultSpeed)*virtualGridToWorldRatio) << 2)
+	minStep := (int(float64(playerDefaultSpeed)*virtualGridToWorldRatio) << 3)
 	playerColliderRadius := float64(12)
 	playerColliders := make([]*resolv.Object, len(playerPosList.Eles))
 	snapIntoPlatformOverlap := float64(0.1)
 	space := resolv.NewSpace(int(spaceW), int(spaceH), minStep, minStep)
+	topPadding, bottomPadding, leftPadding, rightPadding := snapIntoPlatformOverlap, snapIntoPlatformOverlap, snapIntoPlatformOverlap, snapIntoPlatformOverlap
 	for i, playerPos := range playerPosList.Eles {
 		colliderWidth, colliderHeight := playerColliderRadius*2, playerColliderRadius*4
-		playerCollider := GenerateRectCollider(playerPos.X, playerPos.Y, colliderWidth, colliderHeight, snapIntoPlatformOverlap, spaceOffsetX, spaceOffsetY, "Player") // [WARNING] Deliberately not using a circle because "resolv v0.5.1" doesn't yet align circle center with space cell center, regardless of the "specified within-object offset"
+		playerCollider := GenerateRectCollider(playerPos.X, playerPos.Y, colliderWidth, colliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY, "Player") // [WARNING] Deliberately not using a circle because "resolv v0.5.1" doesn't yet align circle center with space cell center, regardless of the "specified within-object offset"
 		Logger.Info(fmt.Sprintf("Player Collider#%d: player world pos=(%.2f, %.2f), shape=%v", i, playerPos.X, playerPos.Y, ConvexPolygonStr(playerCollider.Shape.(*resolv.ConvexPolygon))))
 		playerColliders[i] = playerCollider
 		space.Add(playerCollider)
@@ -60,13 +61,13 @@ func NewWorldColliderDisplay(game *Game, stageDiscreteW, stageDiscreteH, stageTi

 	world.Space = space

-	moveToCollide := false
+	moveToCollide := true
 	if moveToCollide {
 		effPushback := Vec2D{X: float64(0), Y: float64(0)}
 		toTestPlayerCollider := playerColliders[0]
-		newVx, newVy := int32(27999), int32(-420270)
-		colliderWidth, colliderHeight := playerColliderRadius*2, playerColliderRadius*4
-		toTestPlayerCollider.X, toTestPlayerCollider.Y = VirtualGridToPolygonColliderTLPos(newVx, newVy, colliderWidth, colliderHeight, spaceOffsetX, spaceOffsetY, virtualGridToWorldRatio)
+		//colliderWidth, colliderHeight := playerColliderRadius*2, playerColliderRadius*4
+		//newVx, newVy := int32(27999), int32(-420270)
+		//toTestPlayerCollider.X, toTestPlayerCollider.Y = VirtualGridToPolygonColliderBLPos(newVx, newVy, colliderWidth, colliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY, virtualGridToWorldRatio)

 		Logger.Info(fmt.Sprintf("Checking collision for playerShape=%v", ConvexPolygonStr(toTestPlayerCollider.Shape.(*resolv.ConvexPolygon))))

@@ -114,13 +115,12 @@ func NewWorldColliderDisplay(game *Game, stageDiscreteW, stageDiscreteH, stageTi
 		ReleaseTriggerType: int32(1), // 1: rising-edge, 2: falling-edge
 		Damage:             int32(5),
 	}
-	bulletLeftToRight := true
+	bulletLeftToRight := false
 	if bulletLeftToRight {
 		xfac := float64(1.0)
 		offenderWx, offenderWy := playerPosList.Eles[0].X, playerPosList.Eles[0].Y
 		bulletWx, bulletWy := offenderWx+xfac*meleeBullet.HitboxOffset, offenderWy
-
-		newBulletCollider := GenerateRectCollider(bulletWx, bulletWy, meleeBullet.HitboxSize.X, meleeBullet.HitboxSize.Y, 0, spaceOffsetX, spaceOffsetY, "MeleeBullet")
+		newBulletCollider := GenerateRectCollider(bulletWx, bulletWy, meleeBullet.HitboxSize.X, meleeBullet.HitboxSize.Y, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY, "MeleeBullet")
 		space.Add(newBulletCollider)
 		bulletShape := newBulletCollider.Shape.(*resolv.ConvexPolygon)
 		Logger.Warn(fmt.Sprintf("bullet ->: Added bullet collider to space: a=%v", ConvexPolygonStr(bulletShape)))
@@ -137,13 +137,13 @@ func NewWorldColliderDisplay(game *Game, stageDiscreteW, stageDiscreteH, stageTi
 		}
 	}

-	bulletRightToLeft := true
+	bulletRightToLeft := false
 	if bulletRightToLeft {
 		xfac := float64(-1.0)
 		offenderWx, offenderWy := playerPosList.Eles[1].X, playerPosList.Eles[1].Y
 		bulletWx, bulletWy := offenderWx+xfac*meleeBullet.HitboxOffset, offenderWy

-		newBulletCollider := GenerateRectCollider(bulletWx, bulletWy, meleeBullet.HitboxSize.X, meleeBullet.HitboxSize.Y, 0, spaceOffsetX, spaceOffsetY, "MeleeBullet")
+		newBulletCollider := GenerateRectCollider(bulletWx, bulletWy, meleeBullet.HitboxSize.X, meleeBullet.HitboxSize.Y, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY, "MeleeBullet")
 		space.Add(newBulletCollider)
 		bulletShape := newBulletCollider.Shape.(*resolv.ConvexPolygon)
 		Logger.Warn(fmt.Sprintf("bullet <-: Added bullet collider to space: a=%v", ConvexPolygonStr(bulletShape)))
--- a/dnmshared/resolv_helper.go
+++ b/dnmshared/resolv_helper.go
@@ -18,9 +18,13 @@ func ConvexPolygonStr(body *resolv.ConvexPolygon) string {
 	return fmt.Sprintf("{\n%s\n}", strings.Join(s, ",\n"))
 }

-func GenerateRectCollider(wx, wy, w, h, bottomPadding, spaceOffsetX, spaceOffsetY float64, tag string) *resolv.Object {
-	blX, blY := WorldToPolygonColliderBLPos(wx, wy, w*0.5, h*0.5, bottomPadding, spaceOffsetX, spaceOffsetY)
-	return generateRectColliderInCollisionSpace(blX, blY, w, h+bottomPadding, tag)
+func RectCenterStr(body *resolv.Object, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY float64) string {
+	return fmt.Sprintf("{%.2f, %.2f}", body.X + leftPadding + halfBoundingW - spaceOffsetX, body.Y + bottomPadding + halfBoundingH - spaceOffsetY)
+}
+
+func GenerateRectCollider(wx, wy, w, h, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY float64, tag string) *resolv.Object {
+	blX, blY := WorldToPolygonColliderBLPos(wx, wy, w*0.5, h*0.5, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY)
+	return generateRectColliderInCollisionSpace(blX, blY, leftPadding+w+rightPadding, bottomPadding+h+topPadding, tag)
 }

 func generateRectColliderInCollisionSpace(blX, blY, w, h float64, tag string) *resolv.Object {
@@ -246,38 +250,20 @@ func VirtualGridToWorldPos(vx, vy int32, virtualGridToWorldRatio float64) (float
 	return wx, wy
 }

-func WorldToPolygonColliderBLPos(wx, wy, halfBoundingW, halfBoundingH, bottomPadding, collisionSpaceOffsetX, collisionSpaceOffsetY float64) (float64, float64) {
-	return wx - halfBoundingW + collisionSpaceOffsetX, wy - halfBoundingH - bottomPadding + collisionSpaceOffsetY
+func WorldToPolygonColliderBLPos(wx, wy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, collisionSpaceOffsetX, collisionSpaceOffsetY float64) (float64, float64) {
+	return wx - halfBoundingW - leftPadding + collisionSpaceOffsetX, wy - halfBoundingH - bottomPadding + collisionSpaceOffsetY
 }

-func WorldToPolygonColliderTLPos(wx, wy, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY float64) (float64, float64) {
-	return wx - halfBoundingW + collisionSpaceOffsetX, wy + halfBoundingH + collisionSpaceOffsetY
+func PolygonColliderBLToWorldPos(cx, cy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, collisionSpaceOffsetX, collisionSpaceOffsetY float64) (float64, float64) {
+	return cx + halfBoundingW + leftPadding - collisionSpaceOffsetX, cy + halfBoundingH + bottomPadding - collisionSpaceOffsetY
 }

-func PolygonColliderBLToWorldPos(cx, cy, halfBoundingW, halfBoundingH, bottomPadding, collisionSpaceOffsetX, collisionSpaceOffsetY float64) (float64, float64) {
-	return cx + halfBoundingW - collisionSpaceOffsetX, cy + halfBoundingH + bottomPadding - collisionSpaceOffsetY
-}
-
-func PolygonColliderTLToWorldPos(cx, cy, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY float64) (float64, float64) {
-	return cx + halfBoundingW - collisionSpaceOffsetX, cy - halfBoundingH - collisionSpaceOffsetY
-}
-
-func PolygonColliderBLToVirtualGridPos(cx, cy, halfBoundingW, halfBoundingH, bottomPadding, collisionSpaceOffsetX, collisionSpaceOffsetY float64, worldToVirtualGridRatio float64) (int32, int32) {
-	wx, wy := PolygonColliderBLToWorldPos(cx, cy, halfBoundingW, halfBoundingH, bottomPadding, collisionSpaceOffsetX, collisionSpaceOffsetY)
+func PolygonColliderBLToVirtualGridPos(cx, cy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, collisionSpaceOffsetX, collisionSpaceOffsetY float64, worldToVirtualGridRatio float64) (int32, int32) {
+	wx, wy := PolygonColliderBLToWorldPos(cx, cy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, collisionSpaceOffsetX, collisionSpaceOffsetY)
 	return WorldToVirtualGridPos(wx, wy, worldToVirtualGridRatio)
 }

-func PolygonColliderTLToVirtualGridPos(cx, cy, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY float64, worldToVirtualGridRatio float64) (int32, int32) {
-	wx, wy := PolygonColliderTLToWorldPos(cx, cy, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY)
-	return WorldToVirtualGridPos(wx, wy, worldToVirtualGridRatio)
-}
-
-func VirtualGridToPolygonColliderBLPos(vx, vy int32, halfBoundingW, halfBoundingH, bottomPadding, collisionSpaceOffsetX, collisionSpaceOffsetY float64, virtualGridToWorldRatio float64) (float64, float64) {
+func VirtualGridToPolygonColliderBLPos(vx, vy int32, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, collisionSpaceOffsetX, collisionSpaceOffsetY float64, virtualGridToWorldRatio float64) (float64, float64) {
 	wx, wy := VirtualGridToWorldPos(vx, vy, virtualGridToWorldRatio)
-	return WorldToPolygonColliderBLPos(wx, wy, halfBoundingW, halfBoundingH, bottomPadding, collisionSpaceOffsetX, collisionSpaceOffsetY)
-}
-
-func VirtualGridToPolygonColliderTLPos(vx, vy int32, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY float64, virtualGridToWorldRatio float64) (float64, float64) {
-	wx, wy := VirtualGridToWorldPos(vx, vy, virtualGridToWorldRatio)
-	return WorldToPolygonColliderTLPos(wx, wy, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY)
+	return WorldToPolygonColliderBLPos(wx, wy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, collisionSpaceOffsetX, collisionSpaceOffsetY)
 }
--- a/frontend/assets/resources/pbfiles/room_downsync_frame.proto
+++ b/frontend/assets/resources/pbfiles/room_downsync_frame.proto
@@ -76,6 +76,7 @@ message InputsBufferSnapshot {
  int32 refRenderFrameId = 1;    
  uint64 unconfirmedMask = 2;
  repeated InputFrameDownsync toSendInputFrameDownsyncs = 3;
+  bool shouldForceResync = 4;
 }

 message MeleeBullet { 
@@ -151,4 +152,5 @@ message RoomDownsyncFrame {
  int64 countdownNanos = 3;
  repeated MeleeBullet meleeBullets = 4; // I don't know how to mimic inheritance/composition in protobuf by far, thus using an array for each type of bullet as a compromise 
  uint64 backendUnconfirmedMask = 5; // Indexed by "joinIndex", same compression concern as stated in InputFrameDownsync
+  bool shouldForceResync = 6;
 }
--- a/frontend/assets/scenes/login.fire
+++ b/frontend/assets/scenes/login.fire
@@ -440,7 +440,7 @@
      "array": [
        0,
        0,
-        216.19964242526865,
+        216.05530045313827,
        0,
        0,
        0,
--- a/frontend/assets/scenes/offline_map_1.fire
+++ b/frontend/assets/scenes/offline_map_1.fire
@@ -454,7 +454,7 @@
      "array": [
        0,
        0,
-        216.67520680312998,
+        209.73151519075364,
        0,
        0,
        0,
--- a/frontend/assets/scripts/Map.js
+++ b/frontend/assets/scripts/Map.js
@@ -588,12 +588,13 @@ cc.Class({
    }
    const shouldForceDumping1 = (window.MAGIC_ROOM_DOWNSYNC_FRAME_ID.BATTLE_START == rdf.id);
    const shouldForceDumping2 = (rdf.id > self.renderFrameId + self.renderFrameIdLagTolerance);
+    const shouldForceResync = rdf.shouldForceResync;

-    const [dumpRenderCacheRet, oldStRenderFrameId, oldEdRenderFrameId] = (shouldForceDumping1 || shouldForceDumping2) ? self.recentRenderCache.setByFrameId(rdf, rdf.id) : [window.RING_BUFF_CONSECUTIVE_SET, null, null];
+    const [dumpRenderCacheRet, oldStRenderFrameId, oldEdRenderFrameId] = (shouldForceDumping1 || shouldForceDumping2 || shouldForceResync) ? self.recentRenderCache.setByFrameId(rdf, rdf.id) : [window.RING_BUFF_CONSECUTIVE_SET, null, null];
    if (window.RING_BUFF_FAILED_TO_SET == dumpRenderCacheRet) {
      throw `Failed to dump render cache#1 (maybe recentRenderCache too small)! rdf.id=${rdf.id}, lastAllConfirmedRenderFrameId=${self.lastAllConfirmedRenderFrameId}, lastAllConfirmedInputFrameId=${self.lastAllConfirmedInputFrameId}; recentRenderCache=${self._stringifyRecentRenderCache(false)}, recentInputCache=${self._stringifyRecentInputCache(false)}`;
    }
-    if (window.MAGIC_ROOM_DOWNSYNC_FRAME_ID.BATTLE_START < rdf.id && window.RING_BUFF_CONSECUTIVE_SET == dumpRenderCacheRet) {
+    if (!shouldForceResync && (window.MAGIC_ROOM_DOWNSYNC_FRAME_ID.BATTLE_START < rdf.id && window.RING_BUFF_CONSECUTIVE_SET == dumpRenderCacheRet)) {
      /*
      Don't change 
      - lastAllConfirmedRenderFrameId, it's updated only in "rollbackAndChase" (except for when RING_BUFF_NON_CONSECUTIVE_SET) 
@@ -784,10 +785,16 @@ cc.Class({
    const [wx, wy] = self.virtualGridToWorldPos(vx, vy);
    newPlayerNode.setPosition(wx, wy);
    playerScriptIns.mapNode = self.node;
-    const colliderWidth = playerDownsyncInfo.colliderRadius * 2,
-      colliderHeight = playerDownsyncInfo.colliderRadius * 4;
-    const cpos = self.virtualGridToPolygonColliderTLPos(vx, vy, colliderWidth * 0.5, colliderHeight * 0.5); // the top-left corner is kept having integer coords
-    const pts = [[0, 0], [colliderWidth, 0], [colliderWidth, -colliderHeight - self.snapIntoPlatformOverlap], [0, -colliderHeight - self.snapIntoPlatformOverlap]];
+    const halfColliderWidth = playerDownsyncInfo.colliderRadius,
+      halfColliderHeight = playerDownsyncInfo.colliderRadius + playerDownsyncInfo.colliderRadius; // avoid multiplying
+    const colliderWidth = halfColliderWidth + halfColliderWidth,
+      colliderHeight = halfColliderHeight + halfColliderHeight; // avoid multiplying
+    const leftPadding = self.snapIntoPlatformOverlap,
+      rightPadding = self.snapIntoPlatformOverlap,
+      topPadding = self.snapIntoPlatformOverlap,
+      bottomPadding = self.snapIntoPlatformOverlap;
+    const cpos = self.virtualGridToPolygonColliderBLPos(vx, vy, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding); // the collider center is kept having integer coords
+    const pts = [[0, 0], [leftPadding + colliderWidth + rightPadding, 0], [leftPadding + colliderWidth + rightPadding, bottomPadding + colliderHeight + topPadding], [0, bottomPadding + colliderHeight + topPadding]];

    // [WARNING] The animNode "anchor & offset" are tuned to fit in this collider by "ControlledCharacter prefab & AttackingCharacter.js"! 
    const newPlayerCollider = self.collisionSys.createPolygon(cpos[0], cpos[1], pts);
@@ -997,6 +1004,10 @@ cc.Class({

  showDebugBoundaries(rdf) {
    const self = this;
+    const leftPadding = self.snapIntoPlatformOverlap,
+      rightPadding = self.snapIntoPlatformOverlap,
+      topPadding = self.snapIntoPlatformOverlap,
+      bottomPadding = self.snapIntoPlatformOverlap;
    if (self.showCriticalCoordinateLabels) {
      let g = self.g;
      g.clear();
@@ -1048,8 +1059,10 @@ cc.Class({
          const [offenderWx, offenderWy] = self.virtualGridToWorldPos(offender.virtualGridX, offender.virtualGridY);
          const bulletWx = offenderWx + xfac * meleeBullet.hitboxOffset;
          const bulletWy = offenderWy;
-          const bulletCpos = self.worldToPolygonColliderTLPos(bulletWx, bulletWy, meleeBullet.hitboxSize.x * 0.5, meleeBullet.hitboxSize.y * 0.5);
-          const pts = [[0, 0], [meleeBullet.hitboxSize.x, 0], [meleeBullet.hitboxSize.x, -meleeBullet.hitboxSize.y], [0, -meleeBullet.hitboxSize.y]];
+          const halfColliderWidth = meleeBullet.hitboxSize.x * 0.5,
+            halfColliderHeight = meleeBullet.hitboxSize.y * 0.5; // avoid multiplying
+          const bulletCpos = self.worldToPolygonColliderBLPos(bulletWx, bulletWy, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding);
+          const pts = [[0, 0], [leftPadding + meleeBullet.hitboxSize.x + rightPadding, 0], [leftPadding + meleeBullet.hitboxSize.x + rightPadding, bottomPadding + meleeBullet.hitboxSize.y + topPadding], [0, bottomPadding + meleeBullet.hitboxSize.y + topPadding]];

          g.moveTo(bulletCpos[0], bulletCpos[1]);
          for (let j = 0; j < pts.length; j += 1) {
@@ -1079,6 +1092,10 @@ cc.Class({
  // TODO: Write unit-test for this function to compare with its backend counter part
  applyInputFrameDownsyncDynamicsOnSingleRenderFrame(delayedInputFrame, currRenderFrame, collisionSys, collisionSysMap) {
    const self = this;
+    const leftPadding = self.snapIntoPlatformOverlap,
+      rightPadding = self.snapIntoPlatformOverlap,
+      topPadding = self.snapIntoPlatformOverlap,
+      bottomPadding = self.snapIntoPlatformOverlap;
    const nextRenderFramePlayers = {};
    for (let playerId in currRenderFrame.players) {
      const currPlayerDownsync = currRenderFrame.players[playerId];
@@ -1188,10 +1205,14 @@ cc.Class({
      const currPlayerDownsync = currRenderFrame.players[playerId];
      const thatPlayerInNextFrame = nextRenderFramePlayers[playerId];
      // Reset playerCollider position from the "virtual grid position"
-      const [newVx, newVy] = [currPlayerDownsync.virtualGridX + currPlayerDownsync.velX, currPlayerDownsync.virtualGridY + currPlayerDownsync.velY];
-      const colliderWidth = self.playerRichInfoArr[joinIndex - 1].colliderRadius * 2,
-        colliderHeight = self.playerRichInfoArr[joinIndex - 1].colliderRadius * 4;
-      const newCpos = self.virtualGridToPolygonColliderTLPos(newVx, newVy, colliderWidth * 0.5, colliderHeight * 0.5);
+      const newVpos = [currPlayerDownsync.virtualGridX + currPlayerDownsync.velX, currPlayerDownsync.virtualGridY + currPlayerDownsync.velY];
+      if (thatPlayerInNextFrame.velY == self.jumpingInitVelY) {
+        // This step can be waived, but putting the jumping inclination here makes it easier to read logs. 
+        newVpos[1] += self.jumpingInitVelY;
+      }
+      const halfColliderWidth = self.playerRichInfoArr[j].colliderRadius,
+        halfColliderHeight = self.playerRichInfoArr[j].colliderRadius + self.playerRichInfoArr[j].colliderRadius; // avoid multiplying
+      const newCpos = self.virtualGridToPolygonColliderBLPos(newVpos[0], newVpos[1], halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding);
      playerCollider.x = newCpos[0];
      playerCollider.y = newCpos[1];

@@ -1223,8 +1244,10 @@ cc.Class({
        const [offenderWx, offenderWy] = self.virtualGridToWorldPos(offender.virtualGridX, offender.virtualGridY);
        const bulletWx = offenderWx + xfac * meleeBullet.hitboxOffset;
        const bulletWy = offenderWy;
-        const bulletCpos = self.worldToPolygonColliderTLPos(bulletWx, bulletWy, meleeBullet.hitboxSize.x * 0.5, meleeBullet.hitboxSize.y * 0.5),
-          pts = [[0, 0], [meleeBullet.hitboxSize.x, 0], [meleeBullet.hitboxSize.x, -meleeBullet.hitboxSize.y], [0, -meleeBullet.hitboxSize.y]];
+        const halfColliderWidth = meleeBullet.hitboxSize.x * 0.5,
+          halfColliderHeight = meleeBullet.hitboxSize.y * 0.5;
+        const bulletCpos = self.worldToPolygonColliderBLPos(bulletWx, bulletWy, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding);
+        const pts = [[0, 0], [leftPadding + meleeBullet.hitboxSize.x + rightPadding, 0], [leftPadding + meleeBullet.hitboxSize.x + rightPadding, bottomPadding + meleeBullet.hitboxSize.y + topPadding], [0, bottomPadding + meleeBullet.hitboxSize.y + topPadding]];
        const newBulletCollider = collisionSys.createPolygon(bulletCpos[0], bulletCpos[1], pts);
        newBulletCollider.data = meleeBullet;
        collisionSysMap.set(collisionBulletIndex, newBulletCollider);
@@ -1248,6 +1271,9 @@ cc.Class({

      const currPlayerDownsync = currRenderFrame.players[playerId];
      const thatPlayerInNextFrame = nextRenderFramePlayers[playerId];
+      const halfColliderWidth = self.playerRichInfoArr[j].colliderRadius,
+        halfColliderHeight = self.playerRichInfoArr[j].colliderRadius + self.playerRichInfoArr[j].colliderRadius; // avoid multiplying
+
      let fallStopping = false;
      let possiblyFallStoppedOnAnotherPlayer = false;
      for (const potential of potentials) {
@@ -1261,10 +1287,16 @@ cc.Class({
        const landedOnGravityPushback = (self.snapIntoPlatformThreshold < normAlignmentWithGravity); // prevents false snapping on the lateral sides
        let pushback = [result.overlap * result.overlap_x, result.overlap * result.overlap_y];
        if (landedOnGravityPushback) {
-          // kindly note that one player might land on top of another player, and snapping is also required in such case
+          // kindly note that one player might land on top of another player
          pushback = [(result.overlap - self.snapIntoPlatformOverlap) * result.overlap_x, (result.overlap - self.snapIntoPlatformOverlap) * result.overlap_y];
          thatPlayerInNextFrame.inAir = false;
        }
+        if (isAnotherPlayer) {
+          /*
+            [WARNING] The "zero overlap collision" might be randomly detected/missed on either frontend or backend, to have deterministic result we added paddings to all sides of a playerCollider. As each velocity component of (velX, velY) being a multiple of 0.5 at any renderFrame, each position component of (x, y) can only be a multiple of 0.5 too, thus whenever a 1-dimensional collision happens between players from [player#1: i*0.5, player#2: j*0.5, not collided yet] to [player#1: (i+k)*0.5, player#2: j*0.5, collided], the overlap becomes (i+k-j)*0.5+2*s, and after snapping subtraction the effPushback magnitude for each player is (i+k-j)*0.5, resulting in 0.5-multiples-position for the next renderFrame.
+          */
+          pushback = [(result.overlap - self.snapIntoPlatformOverlap * 2) * result.overlap_x, (result.overlap - self.snapIntoPlatformOverlap * 2) * result.overlap_y]; // will overwrite the previous pushback value if "landedOnGravityPushback" is also true
+        }
        for (let hardPushbackNorm of hardPushbackNorms[joinIndex - 1]) {
          // remove pushback component on the directions of "hardPushbackNorms[joinIndex-1]" (by now those hardPushbacks are already accounted in "effPushbacks[joinIndex-1]")
          const projectedMagnitude = pushback[0] * hardPushbackNorm[0] + pushback[1] * hardPushbackNorm[1];
@@ -1281,23 +1313,29 @@ cc.Class({

        effPushbacks[joinIndex - 1][0] += pushback[0];
        effPushbacks[joinIndex - 1][1] += pushback[1];
+        // It's not meaningful to log the virtual positions and velocities inside this step.
        if (currPlayerDownsync.inAir && landedOnGravityPushback) {
          fallStopping = true;
          if (isAnotherPlayer) {
            possiblyFallStoppedOnAnotherPlayer = true;
          }
-          if (1 == thatPlayerInNextFrame.joinIndex) {
-            console.log(`playerId=${playerId}, joinIndex=${currPlayerDownsync.joinIndex} fallStopping#1 at {renderFrame.id: ${currRenderFrame.id}, virtualX: ${currPlayerDownsync.virtualGridX}, virtualY: ${currPlayerDownsync.virtualGridY}, velX: ${currPlayerDownsync.velX}, velY: ${currPlayerDownsync.velY}} with effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}, overlayMag=${result.overlap.toFixed(4)}, possiblyFallStoppedOnAnotherPlayer=${possiblyFallStoppedOnAnotherPlayer}`);
+        }
+
+        if (1 == joinIndex) {
+          if (fallStopping) {
+            console.info(`playerId=${playerId}, joinIndex=${thatPlayerInNextFrame.joinIndex} fallStopping#1:
+{renderFrame.id: ${currRenderFrame.id}, possiblyFallStoppedOnAnotherPlayer: ${possiblyFallStoppedOnAnotherPlayer}}
+playerColliderPos=${self.stringifyColliderCenterInWorld(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding)}, effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}, overlayMag=${result.overlap.toFixed(4)}`);
+          } else if (currPlayerDownsync.inAir && isBarrier && !landedOnGravityPushback) {
+            console.warn(`playerId=${playerId}, joinIndex=${currPlayerDownsync.joinIndex} inAir & pushed back by barrier & not landed:
+{renderFrame.id: ${currRenderFrame.id}}
+playerColliderPos=${self.stringifyColliderCenterInWorld(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding)}, effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}, overlayMag=${result.overlap.toFixed(4)}, len(hardPushbackNorms)=${hardPushbackNorms.length}`);
+          } else if (currPlayerDownsync.inAir && isAnotherPlayer) {
+            console.warn(`playerId=${playerId}, joinIndex=${currPlayerDownsync.joinIndex} inAir and pushed back by another player
+{renderFrame.id: ${currRenderFrame.id}}
+playerColliderPos=${self.stringifyColliderCenterInWorld(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding)}, anotherPlayerColliderPos=${self.stringifyColliderCenterInWorld(potential, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding)}, effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}, landedOnGravityPushback=${landedOnGravityPushback}, fallStopping=${fallStopping}, overlayMag=${result.overlap.toFixed(4)}, len(hardPushbackNorms)=${hardPushbackNorms.length}`);
          }
        }
-
-        if (1 == joinIndex && currPlayerDownsync.inAir && isBarrier && !landedOnGravityPushback) {
-          console.warn(`playerId=${playerId}, joinIndex=${currPlayerDownsync.joinIndex} inAir & pushed back by barrier & not landed at {renderFrame.id: ${currRenderFrame.id}, virtualX: ${currPlayerDownsync.virtualGridX}, virtualY: ${currPlayerDownsync.virtualGridY}, velX: ${currPlayerDownsync.velX}, velY: ${currPlayerDownsync.velY}} with effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}, playerColliderPos={${playerCollider.x.toFixed(3)}, ${playerCollider.y.toFixed(3)}}, barrierPos={${potential.x.toFixed(3)}, ${potential.y.toFixed(3)}}, overlayMag=${result.overlap.toFixed(4)}, len(hardPushbackNorms)=${hardPushbackNorms.length}`);
-        }
-
-        if (1 == joinIndex && currPlayerDownsync.inAir && isAnotherPlayer) {
-          console.warn(`playerId=${playerId}, joinIndex=${currPlayerDownsync.joinIndex} inAir and pushed back by another player at {renderFrame.id: ${currRenderFrame.id}, virtualX: ${currPlayerDownsync.virtualGridX}, virtualY: ${currPlayerDownsync.virtualGridY}, velX: ${currPlayerDownsync.velX}, velY: ${currPlayerDownsync.velY}} with effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}, landedOnGravityPushback=${landedOnGravityPushback}, fallStopping=${fallStopping}, playerColliderPos={${playerCollider.x.toFixed(3)}, ${playerCollider.y.toFixed(3)}}, anotherPlayerColliderPos={${potential.x.toFixed(3)}, ${potential.y.toFixed(3)}}, overlayMag=${result.overlap.toFixed(4)}, len(hardPushbackNorms)=${hardPushbackNorms.length}`);
-        }
      }

      if (fallStopping) {
@@ -1378,21 +1416,27 @@ cc.Class({
      // Update "virtual grid position"
      const currPlayerDownsync = currRenderFrame.players[playerId];
      const thatPlayerInNextFrame = nextRenderFramePlayers[playerId];
-      const colliderWidth = self.playerRichInfoArr[joinIndex - 1].colliderRadius * 2,
-        colliderHeight = self.playerRichInfoArr[joinIndex - 1].colliderRadius * 4;
-      const newVpos = self.polygonColliderTLToVirtualGridPos(playerCollider.x - effPushbacks[joinIndex - 1][0], playerCollider.y - effPushbacks[joinIndex - 1][1], colliderWidth * 0.5, colliderHeight * 0.5);
+      const halfColliderWidth = self.playerRichInfoArr[j].colliderRadius,
+        halfColliderHeight = self.playerRichInfoArr[j].colliderRadius + self.playerRichInfoArr[j].colliderRadius; // avoid multiplying
+      const newVpos = self.polygonColliderBLToVirtualGridPos(playerCollider.x - effPushbacks[joinIndex - 1][0], playerCollider.y - effPushbacks[joinIndex - 1][1], halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding);
      thatPlayerInNextFrame.virtualGridX = newVpos[0];
      thatPlayerInNextFrame.virtualGridY = newVpos[1];

      if (1 == thatPlayerInNextFrame.joinIndex) {
-        if (thatPlayerInNextFrame.inAir && 0 != thatPlayerInNextFrame.velY) {
-          // console.log(`playerId=${playerId}, joinIndex=${thatPlayerInNextFrame.joinIndex} inAir trajectory: {nextRenderFrame.id: ${currRenderFrame.id + 1}, nextVirtualX: ${thatPlayerInNextFrame.virtualGridX}, nextVirtualY: ${thatPlayerInNextFrame.virtualGridY}, nextVelX: ${thatPlayerInNextFrame.velX}, nextVelY: ${thatPlayerInNextFrame.velY}}, with playerColliderPos={${playerCollider.x.toFixed(3)}, ${playerCollider.y.toFixed(3)}}, effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}`);
-        }
        if (currPlayerDownsync.inAir && !thatPlayerInNextFrame.inAir) {
-          console.warn(`playerId=${playerId}, joinIndex=${thatPlayerInNextFrame.joinIndex} fallStopping#2 at {nextRenderFrame.id: ${currRenderFrame.id + 1}, nextVirtualX: ${thatPlayerInNextFrame.virtualGridX}, nextVirtualY: ${thatPlayerInNextFrame.virtualGridY}, nextVelX: ${thatPlayerInNextFrame.velX}, nextVelY: ${thatPlayerInNextFrame.velY}}, with playerColliderPos={${playerCollider.x.toFixed(3)}, ${playerCollider.y.toFixed(3)}}, effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}`);
-        }
-        if (!currPlayerDownsync.inAir && thatPlayerInNextFrame.inAir) {
-          console.warn(`playerId=${playerId}, joinIndex=${thatPlayerInNextFrame.joinIndex} took off at {nextRenderFrame.id: ${currRenderFrame.id + 1}, nextVirtualX: ${thatPlayerInNextFrame.virtualGridX}, nextVirtualY: ${thatPlayerInNextFrame.virtualGridY}, nextVelX: ${thatPlayerInNextFrame.velX}, nextVelY: ${thatPlayerInNextFrame.velY}}, with playerColliderPos={${playerCollider.x.toFixed(3)}, ${playerCollider.y.toFixed(3)}}, effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}`);
+          console.warn(`playerId=${playerId}, joinIndex=${thatPlayerInNextFrame.joinIndex} fallStopping#2:
+{nextRenderFrame.id: ${currRenderFrame.id + 1}, nextVirtualX: ${thatPlayerInNextFrame.virtualGridX}, nextVirtualY: ${thatPlayerInNextFrame.virtualGridY}, nextVelX: ${thatPlayerInNextFrame.velX}, nextVelY: ${thatPlayerInNextFrame.velY}}
+	calculated from <- playerColliderPos=${self.stringifyColliderCenterInWorld(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding)}, effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}`);
+        } else if (!currPlayerDownsync.inAir && thatPlayerInNextFrame.inAir) {
+          console.warn(`playerId=${playerId}, joinIndex=${thatPlayerInNextFrame.joinIndex} took off:
+{nextRenderFrame.id: ${currRenderFrame.id + 1}, nextVirtualX: ${thatPlayerInNextFrame.virtualGridX}, nextVirtualY: ${thatPlayerInNextFrame.virtualGridY}, nextVelX: ${thatPlayerInNextFrame.velX}, nextVelY: ${thatPlayerInNextFrame.velY}}
+	calculated from <- playerColliderPos=${self.stringifyColliderCenterInWorld(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding)}, effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}`);
+        } else if (thatPlayerInNextFrame.inAir && 0 != thatPlayerInNextFrame.velY) {
+          /*
+          console.log(`playerId=${playerId}, joinIndex=${thatPlayerInNextFrame.joinIndex} inAir trajectory:
+{nextRenderFrame.id: ${currRenderFrame.id + 1}, nextVirtualX: ${thatPlayerInNextFrame.virtualGridX}, nextVirtualY: ${thatPlayerInNextFrame.virtualGridY}, nextVelX: ${thatPlayerInNextFrame.velX}, nextVelY: ${thatPlayerInNextFrame.velY}};
+          calculated from <- playerColliderPos=${self.stringifyColliderCenterInWorld(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding)}, effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}`);
+          */
        }
      }
    }
@@ -1457,16 +1501,16 @@ cc.Class({
      const immediatePlayerInfo = players[playerId];
      self.playerRichInfoDict.set(playerId, immediatePlayerInfo);

-      const [theNode, theScriptIns] = self.spawnPlayerNode(immediatePlayerInfo.joinIndex, immediatePlayerInfo.virtualGridX, immediatePlayerInfo.virtualGridY, immediatePlayerInfo);
+      const nodeAndScriptIns = self.spawnPlayerNode(immediatePlayerInfo.joinIndex, immediatePlayerInfo.virtualGridX, immediatePlayerInfo.virtualGridY, immediatePlayerInfo);

      Object.assign(self.playerRichInfoDict.get(playerId), {
-        node: theNode,
-        scriptIns: theScriptIns,
+        node: nodeAndScriptIns[0],
+        scriptIns: nodeAndScriptIns[1],
      });

      if (self.selfPlayerInfo.id == playerId) {
        self.selfPlayerInfo = Object.assign(self.selfPlayerInfo, immediatePlayerInfo);
-        theScriptIns.showArrowTipNode();
+        nodeAndScriptIns[1].showArrowTipNode();
      }
    }
    self.playerRichInfoArr = new Array(self.playerRichInfoDict.size);
@@ -1513,29 +1557,31 @@ cc.Class({
  virtualGridToWorldPos(vx, vy) {
    // No loss of precision
    const self = this;
-    let wx = parseFloat(vx) * self.virtualGridToWorldRatio;
-    let wy = parseFloat(vy) * self.virtualGridToWorldRatio;
-    return [wx, wy];
+    return [vx * self.virtualGridToWorldRatio, vy * self.virtualGridToWorldRatio];
  },

-  worldToPolygonColliderTLPos(wx, wy, halfBoundingW, halfBoundingH) {
-    return [wx - halfBoundingW, wy + halfBoundingH];
+  worldToPolygonColliderBLPos(wx, wy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding) {
+    return [wx - halfBoundingW - leftPadding, wy - halfBoundingH - bottomPadding];
  },

-  polygonColliderTLToWorldPos(cx, cy, halfBoundingW, halfBoundingH) {
-    return [cx + halfBoundingW, cy - halfBoundingH];
+  polygonColliderBLToWorldPos(cx, cy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding) {
+    return [cx + halfBoundingW + leftPadding, cy + halfBoundingH + bottomPadding];
  },

-  polygonColliderTLToVirtualGridPos(cx, cy, halfBoundingW, halfBoundingH) {
+  polygonColliderBLToVirtualGridPos(cx, cy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding) {
    const self = this;
-    const [wx, wy] = self.polygonColliderTLToWorldPos(cx, cy, halfBoundingW, halfBoundingH);
+    const [wx, wy] = self.polygonColliderBLToWorldPos(cx, cy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding);
    return self.worldToVirtualGridPos(wx, wy)
  },

-  virtualGridToPolygonColliderTLPos(vx, vy, halfBoundingW, halfBoundingH) {
+  virtualGridToPolygonColliderBLPos(vx, vy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding) {
    const self = this;
    const [wx, wy] = self.virtualGridToWorldPos(vx, vy);
-    return self.worldToPolygonColliderTLPos(wx, wy, halfBoundingW, halfBoundingH)
+    return self.worldToPolygonColliderBLPos(wx, wy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding)
+  },
+
+  stringifyColliderCenterInWorld(playerCollider, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding) {
+    return `{${(playerCollider.x + leftPadding + halfBoundingW).toFixed(2)}, ${(playerCollider.y + bottomPadding + halfBoundingH).toFixed(2)}}`;
  },

  calcHardPushbacksNorms(collider, potentials, result, snapIntoPlatformOverlap, effPushback) {
@@ -1546,11 +1592,10 @@ cc.Class({
      if (!collider.collides(potential, result)) continue;
      // ALWAY snap into hardPushbacks!
      // [overlay_x, overlap_y] is the unit vector that points into the platform
-      const [pushbackX, pushbackY] = [(result.overlap - snapIntoPlatformOverlap) * result.overlap_x, (result.overlap - snapIntoPlatformOverlap) * result.overlap_y];
-
+      const pushback = [(result.overlap - snapIntoPlatformOverlap) * result.overlap_x, (result.overlap - snapIntoPlatformOverlap) * result.overlap_y];
      ret.push([result.overlap_x, result.overlap_y]);
-      effPushback[0] += pushbackX;
-      effPushback[1] += pushbackY;
+      effPushback[0] += pushback[0];
+      effPushback[1] += pushback[1];
    }

    return ret;
--- a/frontend/assets/scripts/OfflineMap.js
+++ b/frontend/assets/scripts/OfflineMap.js
@@ -196,7 +196,7 @@ cc.Class({
        }
      });
      self.selfPlayerInfo = {
-        id: 11
+        id: 10
      };
      self._initPlayerRichInfoDict(startRdf.players);
      self.onRoomDownsyncFrame(startRdf);
--- a/frontend/assets/scripts/modules/room_downsync_frame_proto_bundle.forcemsg.js
+++ b/frontend/assets/scripts/modules/room_downsync_frame_proto_bundle.forcemsg.js
@@ -3654,6 +3654,7 @@ $root.protos = (function() {
         * @property {number|null} [refRenderFrameId] InputsBufferSnapshot refRenderFrameId
         * @property {number|Long|null} [unconfirmedMask] InputsBufferSnapshot unconfirmedMask
         * @property {Array.<protos.InputFrameDownsync>|null} [toSendInputFrameDownsyncs] InputsBufferSnapshot toSendInputFrameDownsyncs
+         * @property {boolean|null} [shouldForceResync] InputsBufferSnapshot shouldForceResync
         */

        /**
@@ -3696,6 +3697,14 @@ $root.protos = (function() {
         */
        InputsBufferSnapshot.prototype.toSendInputFrameDownsyncs = $util.emptyArray;

+        /**
+         * InputsBufferSnapshot shouldForceResync.
+         * @member {boolean} shouldForceResync
+         * @memberof protos.InputsBufferSnapshot
+         * @instance
+         */
+        InputsBufferSnapshot.prototype.shouldForceResync = false;
+
        /**
         * Creates a new InputsBufferSnapshot instance using the specified properties.
         * @function create
@@ -3727,6 +3736,8 @@ $root.protos = (function() {
            if (message.toSendInputFrameDownsyncs != null && message.toSendInputFrameDownsyncs.length)
                for (var i = 0; i < message.toSendInputFrameDownsyncs.length; ++i)
                    $root.protos.InputFrameDownsync.encode(message.toSendInputFrameDownsyncs[i], writer.uint32(/* id 3, wireType 2 =*/26).fork()).ldelim();
+            if (message.shouldForceResync != null && Object.hasOwnProperty.call(message, "shouldForceResync"))
+                writer.uint32(/* id 4, wireType 0 =*/32).bool(message.shouldForceResync);
            return writer;
        };

@@ -3775,6 +3786,10 @@ $root.protos = (function() {
                        message.toSendInputFrameDownsyncs.push($root.protos.InputFrameDownsync.decode(reader, reader.uint32()));
                        break;
                    }
+                case 4: {
+                        message.shouldForceResync = reader.bool();
+                        break;
+                    }
                default:
                    reader.skipType(tag & 7);
                    break;
@@ -3825,6 +3840,9 @@ $root.protos = (function() {
                        return "toSendInputFrameDownsyncs." + error;
                }
            }
+            if (message.shouldForceResync != null && message.hasOwnProperty("shouldForceResync"))
+                if (typeof message.shouldForceResync !== "boolean")
+                    return "shouldForceResync: boolean expected";
            return null;
        };

@@ -3861,6 +3879,8 @@ $root.protos = (function() {
                    message.toSendInputFrameDownsyncs[i] = $root.protos.InputFrameDownsync.fromObject(object.toSendInputFrameDownsyncs[i]);
                }
            }
+            if (object.shouldForceResync != null)
+                message.shouldForceResync = Boolean(object.shouldForceResync);
            return message;
        };

@@ -3886,6 +3906,7 @@ $root.protos = (function() {
                    object.unconfirmedMask = options.longs === String ? long.toString() : options.longs === Number ? long.toNumber() : long;
                } else
                    object.unconfirmedMask = options.longs === String ? "0" : 0;
+                object.shouldForceResync = false;
            }
            if (message.refRenderFrameId != null && message.hasOwnProperty("refRenderFrameId"))
                object.refRenderFrameId = message.refRenderFrameId;
@@ -3899,6 +3920,8 @@ $root.protos = (function() {
                for (var j = 0; j < message.toSendInputFrameDownsyncs.length; ++j)
                    object.toSendInputFrameDownsyncs[j] = $root.protos.InputFrameDownsync.toObject(message.toSendInputFrameDownsyncs[j], options);
            }
+            if (message.shouldForceResync != null && message.hasOwnProperty("shouldForceResync"))
+                object.shouldForceResync = message.shouldForceResync;
            return object;
        };

@@ -5576,6 +5599,7 @@ $root.protos = (function() {
         * @property {number|Long|null} [countdownNanos] RoomDownsyncFrame countdownNanos
         * @property {Array.<protos.MeleeBullet>|null} [meleeBullets] RoomDownsyncFrame meleeBullets
         * @property {number|Long|null} [backendUnconfirmedMask] RoomDownsyncFrame backendUnconfirmedMask
+         * @property {boolean|null} [shouldForceResync] RoomDownsyncFrame shouldForceResync
         */

        /**
@@ -5635,6 +5659,14 @@ $root.protos = (function() {
         */
        RoomDownsyncFrame.prototype.backendUnconfirmedMask = $util.Long ? $util.Long.fromBits(0,0,true) : 0;

+        /**
+         * RoomDownsyncFrame shouldForceResync.
+         * @member {boolean} shouldForceResync
+         * @memberof protos.RoomDownsyncFrame
+         * @instance
+         */
+        RoomDownsyncFrame.prototype.shouldForceResync = false;
+
        /**
         * Creates a new RoomDownsyncFrame instance using the specified properties.
         * @function create
@@ -5673,6 +5705,8 @@ $root.protos = (function() {
                    $root.protos.MeleeBullet.encode(message.meleeBullets[i], writer.uint32(/* id 4, wireType 2 =*/34).fork()).ldelim();
            if (message.backendUnconfirmedMask != null && Object.hasOwnProperty.call(message, "backendUnconfirmedMask"))
                writer.uint32(/* id 5, wireType 0 =*/40).uint64(message.backendUnconfirmedMask);
+            if (message.shouldForceResync != null && Object.hasOwnProperty.call(message, "shouldForceResync"))
+                writer.uint32(/* id 6, wireType 0 =*/48).bool(message.shouldForceResync);
            return writer;
        };

@@ -5748,6 +5782,10 @@ $root.protos = (function() {
                        message.backendUnconfirmedMask = reader.uint64();
                        break;
                    }
+                case 6: {
+                        message.shouldForceResync = reader.bool();
+                        break;
+                    }
                default:
                    reader.skipType(tag & 7);
                    break;
@@ -5815,6 +5853,9 @@ $root.protos = (function() {
            if (message.backendUnconfirmedMask != null && message.hasOwnProperty("backendUnconfirmedMask"))
                if (!$util.isInteger(message.backendUnconfirmedMask) && !(message.backendUnconfirmedMask && $util.isInteger(message.backendUnconfirmedMask.low) && $util.isInteger(message.backendUnconfirmedMask.high)))
                    return "backendUnconfirmedMask: integer|Long expected";
+            if (message.shouldForceResync != null && message.hasOwnProperty("shouldForceResync"))
+                if (typeof message.shouldForceResync !== "boolean")
+                    return "shouldForceResync: boolean expected";
            return null;
        };

@@ -5870,6 +5911,8 @@ $root.protos = (function() {
                    message.backendUnconfirmedMask = object.backendUnconfirmedMask;
                else if (typeof object.backendUnconfirmedMask === "object")
                    message.backendUnconfirmedMask = new $util.LongBits(object.backendUnconfirmedMask.low >>> 0, object.backendUnconfirmedMask.high >>> 0).toNumber(true);
+            if (object.shouldForceResync != null)
+                message.shouldForceResync = Boolean(object.shouldForceResync);
            return message;
        };

@@ -5902,6 +5945,7 @@ $root.protos = (function() {
                    object.backendUnconfirmedMask = options.longs === String ? long.toString() : options.longs === Number ? long.toNumber() : long;
                } else
                    object.backendUnconfirmedMask = options.longs === String ? "0" : 0;
+                object.shouldForceResync = false;
            }
            if (message.id != null && message.hasOwnProperty("id"))
                object.id = message.id;
@@ -5926,6 +5970,8 @@ $root.protos = (function() {
                    object.backendUnconfirmedMask = options.longs === String ? String(message.backendUnconfirmedMask) : message.backendUnconfirmedMask;
                else
                    object.backendUnconfirmedMask = options.longs === String ? $util.Long.prototype.toString.call(message.backendUnconfirmedMask) : options.longs === Number ? new $util.LongBits(message.backendUnconfirmedMask.low >>> 0, message.backendUnconfirmedMask.high >>> 0).toNumber(true) : message.backendUnconfirmedMask;
+            if (message.shouldForceResync != null && message.hasOwnProperty("shouldForceResync"))
+                object.shouldForceResync = message.shouldForceResync;
            return object;
        };
Author	SHA1	Message	Date
genxium	8647c1a859	Enhanced force-resync mechanism to guarantee consistency across all players in a same room upon anyone reconnected.	2022-12-16 18:59:58 +08:00
genxium	a41c68fb13	Applied snapping on all-sides to avoid random zero-overlap detection uncertainty.	2022-12-16 15:57:49 +08:00