Displacement and Vray-Sun shadow - contrast etc.

[Dmerc]

Just found a strange behavior of a displacement map (carpet):

1. Using a Vray sun and Vray-Camera, the displaced carpet displays a strange shadow-edge at the transition to the GI-lit area. It is somehow connected to the Size-Value of the sun, since big size-multipliers result in horrible transitions ...

2. Strangely the sunny part of the carpet displays much darker shadow-areas than the pure GI-lit area. While the Gi-area looks nice and soft bluish, the sunlit area has extremely harsh contrasts, which are partly darker than the GI-area, which looks very strange.



Hope, I made myself clear. How can I avoid this strange behaviour ?

Thanks, regards, Peter

[vlado]

Do you have any bump map on the carpet?

Best regards,
Vlado

[Dmerc]

No bump applied

Thanx for the fast reply, Vlado.

Nope, no bump. If you want I can send you the scene, no ?

Cheers to you !

Peter

[vlado]

If you can send it to vlado@chaosgroup.com, it will be helpful, yes.

Best regards,
Vlado

[vlado]

So this is because of the Oren-Nayar-Blinn shader on the carpet; if you replace this with a regular Blinn shader, or with diffuse VRayMtl, it will render fine.

Best regards,
Vlado

[Dmerc]

Brilliant !

Thanks, Vlado. Great support.

P