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If you want “to force mapping by control point”, then you need to convert the mapping mode to eBY_CONTROL_POINT.
But this conversion does not always make sense.
For example, if the mapping mode of normal is eBY_POLYGON_VERTEX, and you want to convert it to eBY_CONTROL_POINT, then the problem is one control point might have different normal in different polygons that use it. So either you split the mesh to make all polygons do not share any control point, or you need to decide which normal you want to use for certain control point if it is corresponding with more than one normal value. And the former method mean to change the mesh, and the latter one will lose some normal information, which is bad.
Author: Jiayang Xu
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