Light leaks in shelves

[Joelaff]

We have some shelves mounted to the wall. We are getting some light leaks below the shelves when using irradiance mapping. Tried the check visibility option, but didn't seem to help. Just wondered if anyone had any tips for this kind of thing.

Using detail enhancement and multi frame (animation mode medium, though upped subdivision to 55, use camera path on). Maybe our number of interpolation samples is too high 24, but that is how we are smoothing things out. Interpolation frames is 2. It looks fine when the walls move (everything in the scene animates). When they are static is when we see the issue.

Should the shelf inter penetrate the wall? These are board shelves held by brackets, which would not.

Thanks.

[glorybound]

There's a button for that. The Retrace threshold option (with the default value of 1.0) successfully resolves the problem at the expense of slightly increased calculation time for the irradiance map.

[Joelaff]

Hmmm. I have retrace on for my light cache. I even have the threshold higher at 1.9 due to some other flickering I was having in glossy reflections. It was on for the map calculation and the render.

But that's an interesting point that the light cache could cause leaks in the irradiance map. Maybe i need to adjust the LC samples or set it to world scale.

[Morbid Angel]

are those walls of yours shelled?

[Joelaff]

We may have a winner! Need to do another very slow render... But the modeler had deleted the back faces out of an old school attempt to optimize things. I have sealed them up, and we shall see.

Thanks, guys.