It sounds like it's inconsistent winding order in your mesh data.
听起来好像是为了在你的网格数据不一致的绕组。
The winding order (the order in which the Positions that make up each triangle of the mesh are specified) determines whether a given face is front-facing or back-facing.
弯曲顺序 （即指定组成网状每个三角形之位置的顺序） 会决定表面为正对面或背对面。
The winding order (the order in which the Positions that make up each triangle of the mesh are specified) determines whether a given face is front-facing or back-facing.
弯曲顺序 （即指定组成网状每个三角形之位置的顺序） 会决定表面为正对面或背对面。
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