I feel like I can't get in with light bouncing, can you tell me how to optimise it?

[66175545]

Please advise, diffuse, reflective rendering depth are given to 8, also not a lamp, but this is still a black piece, it feels like the light bouncing in, please advise how to optimise (so that the black sector is affected by the light)?

[lee_griggs]

Is it the same metal shader as the rest of it? If it is a different black shader, does it have much specular_weight/roughness?

Are the normals correct?

Does caustics help?

https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_user_guide_ac_openpbr_advanced_html

[66175545]

Thank you very much for the pointers, it's an extruded deformer formed model with an overall metallic reflective material, I've tried cranking up the roughness and increasing the portal light but the results don't seem to be very good (almost no change).

[lee_griggs]

Can you upload a stripped-down version of the geo/lighting that demo the issue somewhere?

[wernienst]

You could try to lower the Metalness value (and the Base Color Weight accordingly). Or use a (very) small Emission value like 0.003. But after all, it's a metallic surface.

[66175545]

Okay, thank you very much for your help.

[66175545]

Thank you very much for pointing this out, it seems to be working, as pictured are some of my tests.