Houdini | Curvature Shader

A curvature shader found in the Odforce forums, courtesy of Mario Marengo. Something that came up at work.

The shader on the forum won't compile directly in H9 because it uses the F variable, which in H9 is used for the BSDF (well one of those BS???? functions...). A simple search and replace of the F keyword with something else immediately gets this shader going.

Omg my Z and X keys are killing me... must get new toy soon..