<%=request("i")%>

1. surface of equation f(x,y,z)=0, spin around x-axis. 2. spin around y-axis.
3. spin around z-axis. 4. positive value of a curve spins around z-axis to make stereo.

f(x,y,z)=" size=80% onChange=javascript:plot3d("spin3D") title="spin3D(x)">
open the graphic in a separate full window.