Triangulated Surface Mesh Segmentation

[AntoineSfx]

Are we close to having something like this in Houdini ?

This is from CGAL

https://doc.cgal.org/latest/Surface_mesh_segmentation/index.html

I don't know exactly what this function computes, but I was hoping that maybe there is a hidden gem somewhere in H that could compute this

[konstantin magnus]

Hi Antoine,

there's a Convex decomposition-node that can do similar things. Otherwise you could create clusters based on reversed ambient occlusion.

mesh_segmentation.hip

[karen]

@konstantin magnus in the second method, what's the difference between

[1] using reversed normals; and

[2] reversing ambient occulsion mask say with an attribute wrangle f@exposure = 1-f@exposure

I've tried both and they clearly don't look the same when visualised. Why use reversed normals instead of reversing the ao mask?

 

q_difference_between_reversed_normals_and_reversed_ao_mask.hiplc

[konstantin magnus]

Reversed surface normals go inwards to measure the inside occlusion of the mesh.
Complementing the outside/ambient exposure (1.0 - exposure) would just remap the values.