private IDAEMaterial CreateMaterial(DAELoaderNode loader, material mat)
        {
            DAEEffect    efx = loader.LibEffects.GetEffect(loader, DAEUtils.GetUrl(mat.instance_effect.url).Id);
            IDAEMaterial m   = efx.CreateMaterial(loader);

            //TODO set parameter

            _materials.Add(mat.id, m);

            return(m);
        }
 internal IDAEMaterial GetDefaultMaterial(DAELoaderNode loader)
 {
     return(DAEEffect.GetDefaultMaterial(loader));
 }