A locus surface: All points on the paraboloid have the same distance to point A and plane p.

Hyperbolic Paraboloid

Another locus surface: The hyperbolic paraboloid consists of points that have the same distance to two lines. In this image the locus surface is textured (checker board) and the sphere shadows the surface.


Here you can see the construction of a dodecahedron. Parts of the construction are still visible. You can hide or show arbitrary objects.