Really amazing. Congrats!

Great job!

Really beautiful and seems very intuitive.
Good job!

I think this is not possible maybe for a limit in Cinema 4d sdk (if I remember correctly).

I have just seen this post and I'm really amazed.
Really an outstanding job. Congratulations! You are a constant (unreachable ) inspiration.

For this project I was able to avoid additional area lights, but anyway I will investigate more for future projects.
Thank a lot atome451 for your help and examples.
Regards

Just as info, is this achievable with multipass in the latest version? It is possibile to separate shadows from different sources? I haven't time to test it.
Thank you

Ok thank you for your effort. Now it is more clear to me.

I try to explain better.
If I use only HDRI I have this clean matte

https://www.dropbox.com/s/je9qezbdvm8aw4e/2a.JPG?dl=0

but if I add also a light in the center of the object the matte is not working for me even if I disable shadows in area light

https://www.dropbox.com/s/4ig3llsx3kmquqz/2b.JPG ...

Thank for your help.
Hope there is a fix for this, but seems that also in 2.22.2 behave the same.
Basically I want to brighten up some parts of my render using lights (hdri dosn't work in this case) without affecting shadows in the shadow catcher plane.