如果骨架在给定状态下没有可见的附件，则不会生成任何子网格指令，因此不会分配任何材质，因为不需要任何材质。 您的设置可能就是这种情况吗？
If the skeleton has no visible attachments at the given state, there are no submesh instructions generated and as a result no materials assigned, since none are required. Is this perhaps the case with your setup?
