Fix bones issues when matrices indices where incomplete

dist/preview release/loaders/babylon.glTF2FileLoader.js

@@ -639,11 +639,11 @@ var BABYLON;
                         }
                         else {
                             var material = _this._gltf.materials[primitive.material];
-                            _this.addPendingData(material);
                             _this.loadMaterial(material, function (babylonMaterial, isNew) {
                                 if (isNew && _this._parent.onMaterialLoaded) {
                                     _this._parent.onMaterialLoaded(babylonMaterial);
                                 }
+                                _this.addPendingData(material);
                                 babylonMaterial.forceCompilation(babylonMesh, function (babylonMaterial) {
                                     babylonMultiMaterial.subMaterials[i] = babylonMaterial;
                                     _this.removePendingData(material);

dist/preview release/loaders/babylon.glTFFileLoader.js

@@ -2797,11 +2797,11 @@ var BABYLON;
                         }
                         else {
                             var material = _this._gltf.materials[primitive.material];
-                            _this.addPendingData(material);
                             _this.loadMaterial(material, function (babylonMaterial, isNew) {
                                 if (isNew && _this._parent.onMaterialLoaded) {
                                     _this._parent.onMaterialLoaded(babylonMaterial);
                                 }
+                                _this.addPendingData(material);
                                 babylonMaterial.forceCompilation(babylonMesh, function (babylonMaterial) {
                                     babylonMultiMaterial.subMaterials[i] = babylonMaterial;
                                     _this.removePendingData(material);

src/Mesh/babylon.geometry.ts

@@ -842,7 +842,7 @@
                 }
 
                 if (binaryInfo.matricesWeightsAttrDesc && binaryInfo.matricesWeightsAttrDesc.count > 0) {
-                    var matricesWeightsData = new Float32Array(parsedGeometry, binaryInfo.matricesWeightsAttrDesc.offset, binaryInfo.matricesWeightsAttrDesc.count);
+                    var matricesWeightsData = new Float32Array(parsedGeometry, binaryInfo.matricesWeightsAttrDesc.offset, binaryInfo.matricesWeightsAttrDesc.count);                    
                     mesh.setVerticesData(VertexBuffer.MatricesWeightsKind, matricesWeightsData, false);
                 }
 
@@ -939,10 +939,12 @@
                 }
 
                 if (parsedGeometry.matricesWeights) {
+                    Geometry._CleanMatricesWeights(parsedGeometry.matricesWeights, parsedGeometry.numBoneInfluencers);
                     mesh.setVerticesData(VertexBuffer.MatricesWeightsKind, parsedGeometry.matricesWeights, parsedGeometry.matricesWeights._updatable);
                 }
 
-                if (parsedGeometry.matricesWeightsExtra) {
+                if (parsedGeometry.matricesWeightsExtra) {                    
+                    Geometry._CleanMatricesWeights(parsedGeometry.matricesWeightsExtra, parsedGeometry.numBoneInfluencers);
                     mesh.setVerticesData(VertexBuffer.MatricesWeightsExtraKind, parsedGeometry.matricesWeightsExtra, parsedGeometry.matricesWeights._updatable);
                 }
 
@@ -974,6 +976,18 @@
             }
         }
 
+        private static _CleanMatricesWeights(matricesWeights: number[], influencers: number): void {
+            let size = matricesWeights.length;
+            for (var i = 0; i < size; i += influencers) {
+                let weight = 0;
+                for (var j = 0; j < influencers - 1; j++) {
+                    weight += matricesWeights[i + j];
+                }
+
+                matricesWeights[i + (influencers - 1)] = Math.max(0, 1.0 - weight);
+            }
+        }
+
         public static Parse(parsedVertexData: any, scene: Scene, rootUrl: string): Geometry {
             if (scene.getGeometryByID(parsedVertexData.id)) {
                 return null; // null since geometry could be something else than a box...