Hi!

I'm trying to procedurally add a material per piece of my geometry inside a for loop, but it does not work (the material created is always the last iteration number).

Any idea how to fix that?

(attached is the hip file)

Thanks!

I think the labs quick material only contains one material, varying it on each iteration only results in one material because materials are created as nodes. To procedurally vary a material, either vary attributes bound to the material, or use stylesheets to create material variations.

In LOPs (solaris) it is possible to create materials in loops, but this is a totally different usd based workflow that does not work with mantra and many renderers are not feature complete with yet.

Good point, sadly that won't work for me since I am trying to export an fbx to be used in Unity.

However I found a dirty trick to make it work: adding an attribute named sop_materialpath varying per piece creates a material per piece on export, even though they do not point to specific materials in Houdini.

this took me a while to get right, however I didn't really find a straight forward answer to this in my search so I am updating this post and the other only one I have seen with this answer.


01) use an attribute wrangle to create an id attribute for each piece set to primitives


02) then use attribute create - set the name to shop_materialpath - set the class to primitive - set the type to string - in the string identifier use material.$ID


this will export your geometry with materials for each piece that can be read by unity, UE5, element 3d and so on. I hope helps answer this question for others in the future more clearly.