copy method
Implementation
@override
Light copy(Object3D source, [bool? recursive]) {
  super.copy(source, false);
  Light source1 = source as Light;
  color?.setFrom(source1.color!);
  intensity = source1.intensity;
  return this;
}@override
Light copy(Object3D source, [bool? recursive]) {
  super.copy(source, false);
  Light source1 = source as Light;
  color?.setFrom(source1.color!);
  intensity = source1.intensity;
  return this;
}