Subdivision Matrix-Catmull Clark SS

Discussion in 'Beginners Zone' started by lilianar, Mar 10, 2012.

  1. lilianar

    Newcomer

    Joined:
    Mar 10, 2012
    Messages:
    1
    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?
     
  2. Simon F

    Simon F Tea maker
    Moderator Veteran Subscriber

    Joined:
    Feb 8, 2002
    Messages:
    4,522
    Location:
    In the Island of Sodor, where the steam trains lie
    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.
     

Share This Page

Loading...