diff --git a/demo/src/game/MainScene.ts b/demo/src/game/MainScene.ts
index 32fc0b3c..c244ae9d 100644
--- a/demo/src/game/MainScene.ts
+++ b/demo/src/game/MainScene.ts
@@ -14,19 +14,21 @@ module scene {
             this.createEntityAsync("bg").then(bg => {
                 bg.addComponent(new component.PlayerController());
                 bg.addComponent(new es.Mover());
-                bg.addComponent(new es.SpriteRenderer(sprite)).setOrigin(sprite.sourceRect.getHalfSize());
+                bg.addComponent(new es.SpriteRenderer(sprite));
                 bg.addComponent(new es.BoxCollider());
+
+                this.camera.follow(bg, es.CameraStyle.lockOn);
             });
             // // bg.addComponent(new es.SpriteRenderer()).setSprite(sprite).setColor(0xff0000);
            
 
-            // for (let i = 0; i < 20; i++) {
-            //     let sprite = new es.Sprite(RES.getRes("checkbox_select_disabled_png"));
-            //     let player2 = this.createEntity("player2");
-            //     player2.addComponent(new es.SpriteRenderer()).setSprite(sprite);
-            //     player2.position = new es.Vector2(Math.random() * 1000, Math.random() * 1000);
-            //     player2.addComponent(new es.BoxCollider());
-            // }
+            for (let i = 0; i < 20; i++) {
+                let sprite = new es.Sprite(RES.getRes("checkbox_select_disabled_png"));
+                let player2 = this.createEntity("player2");
+                player2.addComponent(new es.SpriteRenderer()).setSprite(sprite);
+                player2.position = new es.Vector2(Math.random() * 1000, Math.random() * 1000);
+                player2.addComponent(new es.BoxCollider());
+            }
 
 
             let pool = new es.ComponentPool<component.SimplePooled>(component.SimplePooled);