use opensubdiv to subdivide polygons. this will make maya show polygon's displacement effects realtime. this is not for ptex pipeline. it is for traditional uv mapping pipeline. it is a version for maya2011 or before. it means there is no viewport 2.0 sdk now. then i will publish the version for viewport 2.0~
Merge pull request #1 from applezhao/uvDisplacementView

use opensubdiv to subdivide polygons. this will make maya show polygon's...