Don't add bone weights for duplicate vertices

Author: vkovec

Assets/FbxExporters/Editor/FbxExporter.cs

@@ -1025,8 +1025,17 @@ private bool ExportSkin (SkinnedMeshRenderer skinnedMesh,
             /// </summary>
             private void SetVertexWeights (MeshInfo meshInfo, Dictionary<int, FbxCluster> boneCluster)
             {
+                HashSet<int> visitedVertices = new HashSet<int> ();
+
                 // set the vertex weights for each bone
                 for (int i = 0; i < meshInfo.BoneWeights.Length; i++) {
+                    var actualIndex = ControlPointToIndex [meshInfo.Vertices [i]];
+
+                    if (visitedVertices.Contains (actualIndex)) {
+                        continue;
+                    }
+                    visitedVertices.Add (actualIndex);
+
                     var boneWeights = meshInfo.BoneWeights;
                     int[] indices = {
                         boneWeights [i].boneIndex0,
@@ -1048,7 +1057,8 @@ boneWeights [i].weight3
                         if (!boneCluster.ContainsKey (indices [j])) {
                             continue;
                         }
-                        boneCluster [indices [j]].AddControlPointIndex (ControlPointToIndex[meshInfo.Vertices[i]], weights [j]);
+                        // add vertex and weighting on vertex to this bone's cluster
+                        boneCluster [indices [j]].AddControlPointIndex (actualIndex, weights [j]);
                     }
                 }
             }