This demo employs a 3D interface to display all the diagonals of an Icosahedron and its dual Dodecahedron. I feel the diagonals allows us to see some of the symmetries of these objects not immediately obvious. 1 & 2 keys hide the Icosahedron and the Dodecahedron respectively. Up/Down Right/Left arrows and a/z keys rotate the object along the x,y,z axis.
Thanks to TeslaTech for his remix of my Icosahedron project which gave me the idea for duality. His clever technique for polyhedral vertex connection was new for me and is used here. The 3D interface is a based on a projection algorithm I developed some years ago to make Geometer's Sketchpad display 3D curves. I learned a tremendous amount from @Mr_Pyro_ 3D Wireframe Engine project about optimizing rendering and keyboard effects. Much much thanks.
