I have finally completed all the testing on my Houdini Karma XPU/CPU renderer ShadowCatcher, it is a Shadow Catcher unlike the version which comes with Houdini v21, it works on the Material level using a MaterialX material in the Beauty pass, so, no need to composite the Shadow after the scene has been rendered. It interacts with materials in the scene and in refraction's and reflections, it is very fast using the multi-threaded CPU prior to the render. Now we can all have a Shadow Catcher in Karma like all the other renderers out there, quick, easy to setup and very stable.
It is available on Gumroad:
https://houdinishadowcatcher.gumroad.com/l/gggwv [houdinishadowcatcher.gumroad.com]

Hi! Any possibility to see a demo video to see how it is working?

noicevstime
Hi! Any possibility to see a demo video to see how it is working?

Yep...