Does anybody know of any online tool/applet that can be used to graph quadric surfaces? i.e. If I want an elliptic paraboloid, I can click on "elliptic paraboloid" and enter my own specified values for a, b, and c. I couldn't find one on google, any ideas?
The POV-Ray 3D renderer can render quadric surfaces, as well as plenty of others. It's not an applet, and it may not be quite as easy to use at first as you envision, but the results can certainly be pretty.