I've been learning Houdini for about a month now, and I'm trying to figure out how to use compiling to speed up part of my tool. I'm working on a procedural archive shelf generator, and in order to use UDIMs in Unreal Engine, I have to unpack each of the books and move their UVs to the correct UDIM tile.

I found a way to do that with a For Each loop, but it was very slow. Now I'm trying to speed things up by compiling, but while my For Each loop is still working, the results seem to be getting erased when the compile block ends. I'm sure the answer is obvious, but I'm struggling to understand the documentation.

Or, alternatively, does anyone know a better way to texture individual books like this? I like UDIMs because I only need one material/material instance in Unreal...



Before compile node ends/after for each:



After compile node ends: