async runScenesFunc(func) {
    const scenes = this.children;
    for (let i = 0; i < scenes.length; i++) {
      const scene = scenes[i];
      for (let j = 0; j < scene.children.length; j++) {
        const node = scene.children[j];
        await func(node);
      }
    }
  }
Prepare loading materials for each scene
@private