Dark, spotty patches in interior rendering

[edheadley]

Hi

 

I've been doing an interior rendering with Vray for 3ds Max and I've got a problem with some dark, spotty patches in certain areas of my image. If you look carefully at the image in the attachment, you can see this on the wall to the left and on the ceiling. How can this be rectified?

 

I suspect this may be an issue with my GI engines though I am not 100% sure.

 

The settings I'm using are as follows:

 

Secondary Ray Bias: 0.02

Image Sampler: Adaptive DMC

Anti-aliasing filter: Mitchtell Netravali

Colour mapping: Exponential (+ sub pixel mapping + clamp rollout)

 

GI Primary engine: Irradiance Map - on 'medium' preset

GI Secondary engine: Light Cache - on 2000 subdivs, rest default

 

No Vray sun, just a GI environment multiplier of 8.

 

Can anyone help with this issue? Thanks a lot in advance.

 

 

[Ismael]

http://forums.cgsociety.org/showthread.php?t=1032460

 

also turn on 'Reflective' GI Caustics in the Vray:: Indirect Illumination (GI) rollout.

[salvador]

Increase IRRMap Hemispherics and Interpolations samples. Increase Lights subdivisions. It's a start.