copy method

Object3D copy(Object3D source, [ bool? recursive = true ])

recursive -- If set to true, descendants of the object are copied next to the existing ones. If set to false, descendants are left unchanged. Default is true.

Copies the given object into this object. Note: Event listeners and user-defined callbacks (onAfterRender and onBeforeRender) are not copied.

Implementation

Object3D copy(Object3D source, [bool? recursive = true]) {
  recursive = recursive ?? true;

  name = source.name;

  up.setFrom(source.up);

  position.setFrom(source.position);
  rotation.order = source.rotation.order;
  quaternion.setFrom(source.quaternion);
  scale.setFrom(source.scale);

  matrix.setFrom(source.matrix);
  matrixWorld.setFrom(source.matrixWorld);

  matrixAutoUpdate = source.matrixAutoUpdate;
  matrixWorldNeedsUpdate = source.matrixWorldNeedsUpdate;

  layers.mask = source.layers.mask;
  visible = source.visible;

  castShadow = source.castShadow;
  receiveShadow = source.receiveShadow;

  frustumCulled = source.frustumCulled;
  renderOrder = source.renderOrder;

  userData = source.userData;//json.decode(json.encode(source.userData));

  if (recursive == true) {
    for (int i = 0; i < source.children.length; i++) {
      final child = source.children[i];
      add(child.clone());
    }
  }

  return this;
}