[add] first

assets/res/model/coin/Materials_coin/coin.mtl

@@ -0,0 +1,48 @@
+{
+  "__type__": "cc.Material",
+  "_name": "",
+  "_objFlags": 0,
+  "_native": "",
+  "_effectAsset": {
+    "__uuid__": "1baf0fc9-befa-459c-8bdd-af1a450a0319",
+    "__expectedType__": "cc.EffectAsset"
+  },
+  "_techIdx": 0,
+  "_defines": [
+    {
+      "USE_INSTANCING": true,
+      "USE_ALBEDO_MAP": true
+    },
+    {},
+    {},
+    {}
+  ],
+  "_states": [
+    {
+      "rasterizerState": {},
+      "depthStencilState": {},
+      "blendState": {
+        "targets": [
+          {}
+        ]
+      }
+    },
+    {},
+    {},
+    {}
+  ],
+  "_props": [
+    {
+      "alphaThreshold": 0,
+      "roughness": 0.333333373069763,
+      "metallic": 0.400000005960464,
+      "mainTexture": {
+        "__uuid__": "c85ef1f6-75a3-4313-846d-b12677718ead@6c48a",
+        "__expectedType__": "cc.Texture2D"
+      }
+    },
+    {},
+    {},
+    {}
+  ]
+}

assets/res/model/coin/Materials_coin/coin.mtl.meta

@@ -0,0 +1,11 @@
+{
+  "ver": "1.0.20",
+  "importer": "material",
+  "imported": true,
+  "uuid": "c7c1e94e-5df5-4d87-854a-df2e03997ed8",
+  "files": [
+    ".json"
+  ],
+  "subMetas": {},
+  "userData": {}
+}