Demo applet for working with pick events on polyhedral surfaces. In this
example, the pick events are used to generate a curve on a polyhedral surface.
The vertices may be picked anywhere on the surface. The program automatically
generates additional vertices when the curve between two pick points crosses a
vertex.
Additionally, points may be picked outside the surface in the background of
the viewer which leads to curve segments lying in the viewing plane centered
at the origin. By rotating the camera, space curves may be generated
independently of the currently displayed surface.
Keep pressing 'i' and pick or drag along surface to generate curve.
Releasing 'i' switches back to default mode.
