1)First, draw a shape in the 2D coordinate system provided via a mouse click and drag. This shape will be rotated about the x-axis. 2)Then hit the SPACE bar to see the wire frame of the Solid of Revolution created in a rotatable 3D interface. Up/Down Right/Left arrows and a/z keys rotate the object along the x,y,z axis.
This visualizer has been created in hopes of aiding Calculus students and teachers in the study of the topic: Solids of Revolution. 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.