maciekstepnik
I have the same problem. Would you mind sharing the link to Reddit's answer? Or point where should I add the color node inside the group of Voronoi fracture? I'm new at Houdini and unfortunately because of major changes from version to version its hard to follow tutorials. I keep spending more time figuring out there are the settings and nodes located rather than learning how to simulate and render.
Gladly, here's the link to my Reddit post: https://www.reddit.com/r/Houdini/comments/dge3pq/voronoi_interior_surface_color/ [www.reddit.com]
Also i'll attach a .hip file for you to dissect.
Basically what was the issue - by default for some reason after Voronoi the material for inside surfaces is the same material used for pig's eyes (or body, which as well not suitable). You can check that in Geometry Spreadsheet on Voronoi node under ‘shop_materialpath’. So i ended up with attribute wrangle node with filter applied to affect only primitives in ‘inside’ group (Voronoi creates 2 groups: inside and outside). In there i just replaced ‘shop_materialpath’. As far as i understand you can just erase it altogether, if you are planning on using Color node after.
I added whitepaint material and used it:
s@shop_materialpath = "/mat/whitepaint";
And after that you can use color node for group ‘inside’. That's it.
I hope it doesn't sound too complicated, took me some time to grasp what's what, but i'm glad i am able to share it with someone who is learning Houdini as well (wow, i'm helpful!)
Also i think spending time on figuring how to overcome Houdini stubbornness is very useful