This demo employs a 3D interface to display an imagined Black Hole with its Event Horizon. Up/Down Right/Left arrows and a/z keys rotate the objects along the x,y,z axis.
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. Featured 10/3/15. Thanks to the Scratch team and all who kindly viewed the work.
