More fun with MDL -- AO or edge or neighbors?

Oso3D

Looking specifically for a way to detect how angled or recessed an area of an object is.

If there was something like Ambient Occlusion, I could use it... but I'm unaware of any such brick in MDL.

If I could read in a patch of a geometry, like say feed in the normal of the neighboring polygons and calculate how much they vary from one another, that would give me a primitive surface detection. But... I can't see a way to actually do that.

Anyone have any ideas?