Lumen directional light still leaks through roof after distance

[Yazzin]

Hello Community,
I have got a problem with light leaking through the roof after a specific distance from the camera, as shown here:

Far Distance

Close Distance

Shot from outisde

Roof mesh is using Nanite.

I tried to fix it by lowering the needed screen percentage, but it didn’t work.
I tried enabling raytraced shadows, which worked but destroyed the volumetric fog.
I tried playing around with the View Distance Settings, but it didn’t work.
I tried setting up 2 direcitonal lights, one for volumetric fog, one for raytraced shadows. They overwrote each other somehow, only one worked, so all in all, it didn’t work.
I tried lowering the roof, it didn’t work.
I tried r.ForceLOD 1 and r.ForceLODShadow 1, it didn’t work.

Is there any way to just raise the view distance the camera is using? The performance cost is irrelevant as this will be a rendered scene.

OR

Is there a way to use ray traced shadows together with volumetric fog?

Thanks in advance,
Yazzin.

[Arkiras]

Are you using Virtual Shadowmaps or regular Shadowmaps?

VSM tends to handle this kind of light leaking better than regular shadowmaps

[Yazzin]

Thanks @Arkiras for pointing that out.
Yeah, that fixes the bleeding happening to the walls somehow together with the fixing of my meshes. I just had bad geometry used with weird displacements and holes, leading to unexpected lighting.
All in all, I can say that focusing on getting the geometry right in early steps of the project will save you a lot of time.