Bright spots appearing when the objects intersect?

[yushi]

Hi everybody

I have this problem with vray. If you look at the attached pictures as you can see a simple render on first picture but as soon as I move the roof-like object a bit down so it intersects with the wall, bright spots appear on the intersection part. Can any body help me with that?

I can attach the max file but it is nothing but simple objects with a vray sky light and vray sun using irradiance map and brute force in vray 1.5

 

thanks

[Thablanch]

- Make sure that your GI settings are high enough.

- In the Irr. Map rollout, / advanced options: check samples visibility checker should help

[Joseph Petrino]

Are you using lightcache for the second bounce?

 

Playing with those settings have fixed that problem for me.

[yushi]

I checked the "check sample visiblity" in irradiance map and it's gone.

thanks