Glen Mullineux, "Surface normals and barycentric coordinates", Mathematical Problems in Engineering, vol. 2, Article ID 984050, 11 pages, 1996. https://doi.org/10.1155/S1024123X96000440
Surface normals and barycentric coordinates
The normal to a triangular parametric surface is investigated where the parameters used are barycentric coordinates. Formulae for the normal are obtained for non-rational and rational surfaces.
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