可能您的动画的活动帧（或设置姿势）或活动皮肤没有可见的附件。 当没有渲染任何内容时，MeshRenderer 上不会分配任何材质。 这是故意的。
当您播放动画或使用应显示某些内容的皮肤时，应相应地填充材质数组。
Likely the active frame of your animation (or the setup pose) or the active skin has no visible attachments. When nothing is rendered, no Materials are assigned at the MeshRenderer. This is intentional.
When you play back an animation or use a skin which should display something, the Materials array should be populated accordingly.
