...
Name of a color AOV to use for the triplanar blending of N. If set to "NPRNtriplanar": need to plug PxrManifold3d into PxrStylizedControl node to provide custom co-ordinate system. Can also be factory "N" "__Nref" if those AOVs are setup.
Triplanar Blending
A value of 0 has no blending, through to 1 for full blending.
...