light leaking?

[mskin]

any idea why this light leaking happens? there aren't any gaps i the geometry

[MARKC]

Where do the edge of thefaces in the ceiling line up at? Are they passing over the top of the wall?

[Macer]

I get this occasionally too. Mostly with models that aren't created in max and in areas formed by two adjoining meshes (ie ceiling and wall).

 

If you are using GI, I found the only way to get rid of it (without trying to edit the geometry) is to check the maximum photon radius option, and use a setting of less than around 2000mm (I normally try and keep it below 1000mm, as close to 200mm as possible - to bring out more detail in complex scenes). This leads to a longer calc time for the GI map (because you have to increase the rays per light to compensate) but if you save it, then you're sorted for any other renders.

 

I can only assume that it has something to do with the massive default photon rays (is it one tenth the size of the whole scene?) not being effectively blocked by single layer of mesh - I remember reading years ago that MR photons didn't like objects with no thickness. Hmm, maybe a shell modifier would sort it then? Something to try next time...

 

Please keep us informed as to what solves it, or any other ideas.

[mskin]

thanks, i think your right concerning the thin geometry. i put a huge box around the project until i have time to understand the issue better, that seams to do the trick for now.