Based on: Boubekeur, T. and Alexa, M. 2008. Phong Tessellation. Proceedings of SIGGRAPH Asia 2008. Vlachos A., Peters J., Boyd C., and Mitchell J. 2001. Curved PN Triangles. Symposium on Interactive 3D Graphics 2001.
Only the shaders for the moment, still interested on that topic, will be uploading complete app...