How can i bake a concavity and convexity map in Blender Cycles

Linko

Hi!

I am trying to bake a concavity and convexity map in Blender Cycles to then generate a curvature map in the compositor.
There is no option to do that in Cycles so i am trying to get a result close to Knald.

Here is the result i get in Knald that i try to reproduce in Blender by baking Suzanne from a plane.
For the concavity:



And the convexity:

Prime8

You can use the Geometry node for that and feed the "pointiness" into a color ramp.
Last time I did try it I had to fiddle a bit with the ramp, the actual range of a satisfying result was somewhere between 0.45 and 0.55.

nickw

hi this is my attempt at a cavity and convexity map
ambient occlusion works well for a cavity map

the convexity map isn't perfect but I thought it might be useful I made it from a displacement map and some nodes

the wavelet filter is a node group I made thats similar to the wavelet decompose effect in gimp

Linko

Thank you for your suggestion but i have baked the monkey head on a plane to show the result but i will bake it on a low poly so i won't get a usable displacement map.

Prime8

Linko said:

Thank you for your suggestion but i have baked the monkey head on a plane to show the result but i will bake it on a low poly so i won't get a usable displacement map.

I don't really understand what you are saying, but doesn't sound like you tried pointiness.
Here is a screenshot with an example.
 

Linko

Pontiness works great on a high poly only and the map becomes more precise only by increasing the density, and the result isn't consistent if an area lacks of triangles. The Concavity from Knald works at every resolution: https://docs.knaldtech.com/doku.php?id=curvature_maps_knald_1.2