A vertex must be split if it has multiple normals, UV coordinates or vertex colors.

如果有多个法线，UV坐标或顶点颜色的顶点必须分割。

youdao

If a vertex has multiple normals (it's on a "hard edge"), or has multiple UV coordinates, or has multiple vertex colors, it has to be split.

如果有多个法线(“硬边缘上”)，或者多个UV坐标或有多个顶点颜色的顶点必须分割。

youdao

If a vertex has multiple normals (it's on a "hard edge"), or has multiple UV coordinates, or has multiple vertex colors, it has to be split.

如果有多个法线，UV坐标或顶点颜色的顶点必须分割。

youdao