private void ExtractLightsAndPrimitives(Model3DGroup group)
{
ArrayList lightList = new ArrayList();
ArrayList primitiveList = new ArrayList();
ExtractLightsAndPrimitivesRecursive(group.CloneCurrentValue(), Matrix3D.Identity, lightList, primitiveList);
lights = new Light[lightList.Count];
primitives = new Model3D[primitiveList.Count];
lightList.CopyTo(lights);
primitiveList.CopyTo(primitives);
}