constraint = Constraint::New<Vector3>( mesh, mesh.GetPropertyIndex(j+3, AnimatableVertex::Property::POSITION), VertexPositionConstraint(-0.5f, LAYER_HEIGHTS[i]) );
constraint.AddSource( Source(meshActor, bouncePropertyIndex) );
constraint.Apply();
constraint = Constraint::New<Vector3>( mesh, mesh.GetPropertyIndex(j+3, AnimatableVertex::Property::POSITION), VertexPositionConstraint(-0.5f, LAYER_HEIGHTS[i]) );
constraint.AddSource( Source(meshActor, bouncePropertyIndex) );
constraint.Apply();