@Didier-Bur Thank you for your effort, now it starts (no more error at start of SU), but it doesnt do what it is supposed to do, as it is described in the animation and description of the first post.
It only creates its own scene... and that's it, the shadow is the same...!
Edit: I dont know if it does matter, but i didnt test it in SU 2024 or 2025, but only in 2023.
I stopped at 2023, and there are many reasons not to go beyond until they fix many things that have been broken starting with 2024, among those being massive rgloader problems, many incompatibilities with extensions, and another one that i will not make it public.