Hi Alex,

this is very helpful answer thanks

Bert

Hello,

At the moment I have a Mac Pro with 2 Intel Xeon X5690 3,46 Ghz with 2 Nvidia GTX 980 cards and 98 GB ram
the viewport is struggling and a project will not render.

Therefore I want to buy a new system

I want to make a custom build PC for work in C4D and rendering in Octane.
I also work ...

Hi Beppe

This circle appears only on Specular Materials.
It is visible In renders with direct lightning and Pathtracing
I changed the Index and it is gone now.

Thanks for your reply but I don't use a HDRI in this scene.

I have on all my renders with reflection a rond circle (shadow) on the bottom half of my renders.
How can I remove this?

Thanks.
Bert