Merge pull request #705 from RaananW/instanced-mesh-fix

Fixing instanced meshes and worker collisions

src/Collisions/babylon.collisionCoordinator.js

@@ -180,7 +180,7 @@ var BABYLON;
                 geometryId = mesh.geometry ? mesh.geometry.id : null;
             }
             else if (mesh instanceof BABYLON.InstancedMesh) {
-                geometryId = mesh.sourceMesh.geometry ? mesh.sourceMesh.geometry.id : null;
+                geometryId = (mesh.sourceMesh && mesh.sourceMesh.geometry) ? mesh.sourceMesh.geometry.id : null;
             }
             return {
                 uniqueId: mesh.uniqueId,

src/Collisions/babylon.collisionCoordinator.ts

@@ -158,7 +158,7 @@ module BABYLON {
             if (mesh instanceof Mesh) {
                 geometryId = (<Mesh>mesh).geometry ? (<Mesh>mesh).geometry.id : null;
             } else if (mesh instanceof InstancedMesh) {
-                geometryId = (<InstancedMesh>mesh).sourceMesh.geometry ? (<InstancedMesh>mesh).sourceMesh.geometry.id : null;
+                geometryId = ((<InstancedMesh>mesh).sourceMesh && (<InstancedMesh>mesh).sourceMesh.geometry) ? (<InstancedMesh>mesh).sourceMesh.geometry.id : null;
             }
 
             return {