clone method
Return a new material with the same parameters as this material.
Implementation
@override
MeshPhysicalMaterial clone() {
  return MeshPhysicalMaterial(<MaterialProperty, dynamic>{}).copy(this);
}Return a new material with the same parameters as this material.
@override
MeshPhysicalMaterial clone() {
  return MeshPhysicalMaterial(<MaterialProperty, dynamic>{}).copy(this);
}