MPEG animations in this directory illustrate the changes in the appearance
of the subdivision surface when scheme parameters are changed. 
The initial mesh for all surfaces is an icosahedron.

For details  about the parameters, see 

D. Zorin, P. Schroeder, W Sweldens. 
Interpolating Subdivision for Meshes with Arbitrary Topology 
Caltech Computer Science Department Technical Report CS-TR-96-06

first.mpg     The first eigenvalue changes from 0.5 to 1,
	      then from 1 to -1, and back to 0.5	

second.mpg    The second eigenvalue changes from 0.25 to 1,
	      then from 1 to -1, and back to 0.25. 

w.mpg         The tension parameter in the Butterfly scheme changes
	      from 0.0 to 0.08, then from 0.08 to 0.08 and back to 0.0.