don't copy materials in renderer components

Author: vkovec

Assets/FbxExporters/Editor/ConvertToModel.cs

@@ -288,14 +288,23 @@ private static void CopyComponents(GameObject from, GameObject to){
                         // if to already has this component, then copy the values over
                         var toComponent = to.GetComponent (components [i].GetType ());
                         if (toComponent != null) {
-                            // don't want to copy MeshFilter because then we will replace the
-                            // exported mesh with the old mesh
+                            // Don't want to copy MeshFilter because then we will replace the
+                            // exported mesh with the old mesh.
+                            // Don't want to copy materials over either in case the materials are
+                            // embedded in another model.
                             if (!(toComponent is MeshFilter)) {
                                 if (toComponent is SkinnedMeshRenderer) {
                                     var skinnedMesh = toComponent as SkinnedMeshRenderer;
                                     var sharedMesh = skinnedMesh.sharedMesh;
+                                    var sharedMats = skinnedMesh.sharedMaterials;
                                     success = UnityEditorInternal.ComponentUtility.PasteComponentValues (toComponent);
                                     skinnedMesh.sharedMesh = sharedMesh;
+                                    skinnedMesh.sharedMaterials = sharedMats;
+                                } else if (toComponent is Renderer) {
+                                    var renderer = toComponent as Renderer;
+                                    var sharedMats = renderer.sharedMaterials;
+                                    success = UnityEditorInternal.ComponentUtility.PasteComponentValues (toComponent);
+                                    renderer.sharedMaterials = sharedMats;
                                 } else {
                                     success = UnityEditorInternal.ComponentUtility.PasteComponentValues (toComponent);
                                 }