Problem with high res

[Numse]

I have some problems with my renders when rendering high res.

I testrendered brakes and rims earlier at 3000*2000px and it worked fine, but when I rendered at 4900*something px the mesh gets blotchy with black spotslike marks. The spots are different size depending on min max values in irr map.

[vlado]

Can you show a part of that image? You can try to render the irradiance map at lower resolution and then use the saved map and see if that fixes it.

Best regards,
Vlado

[Numse]

No I can´t show you anything yet, sorry. But I´ve worked with this some more and if I import the geometry that is blotchy the first render is fine, and sometimes the second, but then it gets blotchy and I need to reimport the geometry, very annoying It workes fine when I´m not using GI.

The geometry is CAD data importet and exported to max via maya.

[joconnell]

Cad data can sometimes bring in things like duplicate faces and so on - it might be an error in the mesh? We'd really need to see a small portion of the render showing the problem and we'd normally be able to tell what's causing it.

[RErender]

Is the irrmap mode set to "incremental add" instead of "single frame", that would make splotches build up.