判断任意深度的嵌套关系：

  

export function isObjectInHierarchy(child, parent) {
  if (!child || !parent) return false;

  let o = child;
  while (o) {
    if (o === parent) return true;
    o = o.parent;
  }
  return false;
}

isDescendant(meshA, groupB); // true / false