Report New shadow leaks in 2.12 dev builds in The Dark Mod Posted Sunday at 01:59 PM Could it be anything to do with the shape of the geometry? Is a curved staircase looking at the images. Or the thickness? Thou by that image those stairs are anything but thin. Is just that I have seen thin walls leak light, while ticker ones do not and I have seen this, in more than one engine even in lightmapped ones. Also is that brush geometry or a imported triangle mesh? You will correct me if wrong but afaik the engine treats triangle mesh's, a tad differently from brush geometry, like it doesn't automatically inline the triangle mesh geometry, into the overall baked brush geometry (unless your force it), so it leaves a invisible "gap" there where the mesh connects with the brush wall? Could be floating point accuracy problems, like you recently talked about?