If some of your triangles are clockwise and others are anti-clockwise, backface culling will be messed up, and holes will randomly appear in the mesh when viewer in real-time.
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- 如果有些用顺时针,有些逆时针,隐面剔除就会发生错误,实时检测模型时就会看见网格上有随机出现的漏洞。