Hey, im trying to find a LPE that would give me something similar to a shadow collector in renderman.
Is this possible in karma?

Disclaimer: I'm not 100% up to speed with karma, so this may be outdated info.

That said: AFAIK Karma does not have a dedicated shadow catcher yet, you have to output shadowed and unshadowed AOVs and take the difference of those to get the actual shadow.

Cool thanks, that seems like a easy enough solution.