Room corners glowing

[Crayox13]

Hi,
I have this weird issue often. Most corners in my renders appear to have increased light instead of be darker. I don't use AO (though that would darken them but also leave some lighter areas so it looks even worse)

I used BF/LC. I tried doubling both BF subdivision and LC but it remained the same. I don't think I have any pure white objects, my whitest white is usually 195, and I used scene converter just in case I have some standard materials left but none helped.

You can see this on some objects, but mostly ceiling near the book shelves.

Oh and, I moved walls vertices beyond ceiling just in case there was a tiny gap causing it but it remained.

[Macker]

Does the problem occur when you use brute force as primary AND secondary bounce?

[TomElc]

Looks like a Light Cache problem to me... Can you post a screen shot of your LC tab so we can see what settings you have used? Have you tried decreasing your sample size?

[TomElc]

Does the problem occur when you use brute force as primary AND secondary bounce?

This is a very good point, and an easy way to test, Make both Brute force if it still occurs make both light cache, that way you will know which is the problem...

[Crayox13]

Hm LC/LC makes a very clean scene (no glowing edges) while BF/BF makes it all black, like there is no GI...weird. I use SolidRocks setup of it. I tried increasing bounces from 3 to 16, since I don't know how BF/BF works, but still basically black.

[vlado]

Does the ceiling have actual thickness or is it just a single plane?

Best regards,
Vlado

[Macker]

It shouldn't turn black when you switch it to BF/BF. Sounds to me like the problem is in the scene and not the render settings.

[Crayox13]

Ceiling is an extruded closed line. But will investigate why the render turns black with bf/bf

[Morne]

Does it turn black if you dont use solidrocks for the settings?

[Crayox13]

I usually only add sun for day scenes without sky portals on windows. It seams that made BF/BF render black. Now I added lights on all windows and BF/BF is ok, but rather darker than LC so I think overlaying those two makes those glowing edges. Any reason LC is so much brighter? I guess I can reduce secondary multiplier to 0.7

[Crayox13]

Here's the new render with lights as sky portals on windows and doors. Also a in progress render capture to show the difference between LC and final render.

[Morne]

It's not just the ceiling. You also have lighter areas between the books and at the bottom of that wall above the skirting.
Post your render settings please

[Crayox13]

Yes, a lot of things seam glowy.

[Vizioen]

I suggest you try without solid rocks and start from the default settings, turn off AA filter, Reinhard color mapping (brightness 0.25, gamma 2.2); enable GI with IR (low) and LC 700, retrace treshold and LC for glossy rays enabled.

Otherwise upload your file or post some screenshots from your viewports and settings.

EDIT: also try an override material, with ur glass geometry in the exclude list.

[DanielBrew]

It looks like your materials are too bright to me. Particularly the place mats, the books and the paint on the walls. Try using diffuse colours with a value < 200 and in the 'output' rollup of your books bitmap reduce the RGB level to 0.784 (200/255).