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Quasi-spherical objects are distorted.
You have a tetrahedron with tesselated faces. The vertices on these
faces have forces on them: one proportional to the distance from the
surface of a sphere; and one proportional to the distance from the
neighbors. They also have inertia. The resulting effect can range
from a shape that does nothing, to a frenetic polygon storm.
Somewhere in between there it usually manifests as a blob that jiggles
in a kind of disturbing manner.
Written by Keith Macleod; 2003.