Evaluates attributes at the subdivision limit surface using Open Subdiv.
It can be used to preserve the curvature of a geometry after adding new geometric detail, or to create an isoline display for a geometry or to sample the normals at the limit surface so the current geometry can have the smoothest normals it can ever have, etc.
https://www.dropbox.com/s/2mr3j1l8mwdu1n7/LimitSurfaceSample_SOP_Animatrix.otl?dl=1
https://www.dropbox.com/s/6zppqhc2qs2jpwy/limitsurfacesample.hip?dl=1