Hettinga, Gerben J.Kosinka, JiriAdrien Peytavie and Carles Bosch2017-04-222017-04-2220171017-4656https://doi.org/10.2312/egsh.20171012https://diglib.eg.org:443/handle/10.2312/egsh20171012We 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.I.3.5 [Computer Graphics]Computational Geometry and Object ModelingSurface representationsplinesI.3.5 [Computer Graphics]Methodology and TechniquesGraphics data structures10.2312/egsh.2017101249-52