I made a small modification to the Vectrosity 1.1 so it supports 3d bezier curves. The webplayer below is an interactive demonstration.
When you press the spacebar, the mouse pointer orbits the camera. If you press it again, the camera stays still. The white spheres that include the curve represent the two anchor handles, ie the points in space that starts and ends.
They are connected via a thin line with the control handles, that control the curvature of the curve.
