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To render a polygon as a subdivision surface, add the RenderMan tab to the OBJ node. Toggle the "Render Polygons As Subdivision" parameter found in the Geometry > SubdivisionMesh rollout. You will also need to set the Style parameter to Catmull-Clark, Bilinear, or Loop. 

The images below were rendered using the PxrVisualizer integrator in Houdini.

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