The curved point-normal triangle, in short PN triangle, is an interpolation algorithm to retrieve a cubic Bézier triangle from the vertex coordinates of a triangle (under the usual polygon definition of a triangle) and normal vectors. The PN triangle retains the vertices of the original triangle as well as the corresponding normals.
The curved point-normal triangle, in short PN triangle, is an interpolation algorithm to retrieve a cubic Bézier triangle from the vertex coordinates of a triangle (under the usual polygon definition of a triangle) and normal vectors. The PN triangle retains the vertices of the original triangle as well as the corresponding normals.
Source: Wikipedia "Point-normal triangle" · CC BY-SA 4.0
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