Unit sphere with 92 vertexes is made from truncated icosahedron by subdivision of every pentagon (hexagom) faces by 5 (6) triangles (one new central vertex with R = 1 is added). Faked illumination is used
brightness = (1 - a) + (L·N)a,   a = 0.2
Therefore sphere backside is collored gradually. Note, that max(0, (L·N)) is used usually.
Use your fingers or mouse to control the model (hold shift key or use mouse wheel to zoom it). Canvas is matched to your browser window.
WebGL Demos     updated 25 May 2020