Phong Tessellation and PN Polygons for Polygonal Models
Gerben J. Hettinga, Jiří Kosinka · University of Groningen research database (University of Groningen / Centre for Information Technology) · 2017
We extend Phong tessellation and point normal (PN) triangles from the original triangular setting to arbitrary polygons by use of generalised barycentric coordinates and S-patches. In addition, a generalisation of the associated quadratic normal field is given as well as a simple algorithm for evaluating the polygonal extensions for a polygon with vertex normals on the GPU.