Selected applications of subdivision surfaces and numerical quadratures for Gregory patches

Abstract

56 4.2.1 Semi-sharp creases 57 4.2.2 Subdivision shading 58 4.2.3 Blending of normal elds 59 4.3 Subdivision shading with semi-sharp creases 61 4.3.1 Blending at sharp vertices 61 4.3.2 Blending at semi-sharp vertices 63 4.3.3 Blending at dart vertices 64 4.3.4 Normals at sharp vertices 64 4.3.5 Implementation 65 4.4 Results 66 4.4.1 Catmull-Clark and Loop subdivision results 67 4.4.2 Blend weights at creases with the two variants 68 4.4.3 Blend weights at darts 70 4.5 Discussion 71 4.6 Conclusions 72