Subdivision Matrix-Catmull Clark SS

[lilianar]

Does anyone know how to actually set up the Subdivision matrix S (local). I read that its rows are to represent the stencils being applied..however, it depends on how you define you points i.e., whether its vertex, edge pt, edge pt, edge pt, face pt, face pt, face pt. or vertex, face pt, edge pt.. etc.

I read Jos Stam's paper "exact evaluation of a Catmull Clark Surface" but I can't seem to understand. Anyone that has good literature or advice on this?

 

[Simon F]

I read this paper years ago. IIRC it notes that repeated evaluation of a point is just the same as applying a matrix to the source input points over and over again and so you can use eigenvector analysis to jump straight to the end result.