problem solved : "highlight was change to 0" (I don't understand why)
I set to 1 and it work very fine.

Thank you very much all

Thank you it work fine
But now I have another problem
Those green or blue dots and very very low performance when i have a displacement map on my scene
Nvidia drivers are up to date (350.12)

Yes, 2.22 for the standalone, but only 2.04 for the plugin

EDIT : Sorry i didn't see you link.
And I don't understand why it don't appear in the download section
I'll try to update and see if there is any change

So, more news.
The scene : (no matte, no displacement, cast shadow on)
shadow1.jpg

Then : cast shadow off, it seem that it work :)
shadow2.jpg

But I have to "composite" this picture, I only want to keep yellow objetcs and their shadows, not the pink ground
I check "matte" for the ground ...

2.21 for standalone and 2.04 for the plugin. I'll check if there is an update for the plugin.

EDIT : no update
I'll try to share the max file, if someone want to try on his PC

Do you mean "ricght clic > Objetcs propriety > Uncheck cast shadow" ??
Because I know this option, and I konw it works with other "render software" like V-Ray, but not with Octane. Octane don't care about this option

It's checked.
I just want to turn off "cast shadow"

You can see the ground is darker on the second picture. We see the shadow of the "relief"

Hi all, sorry for my english, i'm french :)

I have to put an objet on a real scene, and it works.

cast-shadow1.jpg

But, as you can see, the ground is full of "rock" so it's not a plane. I use a displacement map, and it works. BUT, the ground is catching its own shadow. I don't want it catch ...

thaaaaaaaaaaaaaaank you so much it works