extreme highlighs on displacements through glasses using Gamma 2.2

[saudade]

I modeled a carpet and simulated the spikes with a vray displacement , then i placed on it a glass table. Rear the camera there is a window with a skyportal and a sun that goes through it.
Ok, the carpet refracted under the glass is overbrighted and every spike is white, only under the table, all around the table is ok.
Why?
I will attach the render when it will finish.

Vray 1.5Sp5 Max 2010

Best regards.

[saudade]

the example

Notice the table in the lower part of the image.
This scene has nothing special, one sun and 5 skyportals behind the windows
Why the displacemente through the glass is white???

I used gamma 2.2

This image is a small version of the 3507x2478 original file. The image was renderend with my renderfarm

best regards

[saudade]

I rendered the same scene substituting the Irradiance Map with Brute Force and the displacement under the table was clean, without white artifacts

I don't use materials with Color Correct plugin.

Does anyone understand the problem? Is an Irradiance Map bug?

Best regards.

[vlado]

I'm not sure if it's a bug, as then it would probably be apparent everywhere, not only through glass. Does it go away if you don't have displacement?

Best regards,
Vlado

[saudade]

yes, goes away if i disable the displacement

[vlado]

Ok then; is it possible to get us the scene to vray@chaosgroup.com (or at least the part of it that reproduces the problem)?

Best regards,
Vlado

[saudade]

I found the problem cause, it's on Sample lookup.
I always used Overlapping, but switching on Density-based the rendering is correct now.

Haven't I use overlapping? is it only for previews?

Best regards.

[vlado]

Oh, ok. The overlapping mode can produce such results sometimes, especially with relatively low min/max rates.

Best regards,
Vlado