Strange black zones

[stefdln]

Hey everyone
I'm posting here because I'm having a hard time understanding why I do get black spots on this draft render as shown on the attached screenshot.
Any clue someone ?
I'm running Pathtracer + Sobol, total number of bounces 18, diff 6 gloss 6 spec 6
Thanks in advance
Cheers

[B.Y.O.B.]

Without the scene I can only guess that you might have smooth shading enabled without autosmooth?
Enable autosmooth in the mesh settings or add an edge split modifier.

[Sharlybg]

Please try with only matte shader and the result.

[stefdln]

Thanks for the input guys, I will post an update asap, maybe this has to do with the geometry I imported which is an obj file, anyhow playing with the smoothing settings did not improve the result in any kind of way.

[kintuX]

Smooth Shading issues.
Either set to it to Flat, lower Normal Angle or add supporting Edge cuts/loops to the mesh.

[stefdln]

Lowered the normal angle and everything's fine now, thanks to all of you guys and sorry for the non-Lux related issue
Cheers