Black Corners in VXGI Rendering

[anonymous_user_0dafa81b]

I am working on interactive architectural project in Version 4.14 with VXGI.
It is Working perfectly without VXGI.But whenever I added Post-processing Volume with Enable diffuse tracing it creates corners black.

https://forums.unrealengine.com/core/image/gif;base64
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https://forums.unrealengine.com/core/image/gif;base64
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I have used one stationary spotlight at window for lighting.
And other movable lights for ceiling lamps and movable directional light (sun) for VXGI.

These are my Lightmass settings:

https://forums.unrealengine.com/core/image/gif;base64
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These are my Post Processing Volume Settings:

https://forums.unrealengine.com/filedata/fetch?filedataid=123957&type=thumb

https://forums.unrealengine.com/filedata/fetch?filedataid=123958&type=thumb

Is there any solution to avoid black corners?

[anonymous_user_cb9ec8a0]

@rabellogp

First of all, make sure you really have multi-bounce enabled by typing the console command:

r.VXGI.MultiBounceEnable 1

Getting nice results with VXGI is tricky. Although it’s a great realtime GI solution, it’s still a rough approximation compared to baked techniques. You’ll need to be creative with your lights setup to achieve what you want.

Some tips that may help you (at least it’s how I’ve been doing it :p):

• Use a skylight with small intensity to add some base lighting to your scene. That will help to reduce corner darkness where bounced light can’t reach.
• Place the Sunlight in a way it shines through some windows/doors so you can get direct lighting bouncing around the place. For the other windows you can add spotlights with huge outercone angles and low shadow res to simulate some light coming from sky with rough indirect shadows.
• You can turn “VXGI Indirect Lighting” individually for each light in your scene (in Details panel). Experiment with that and make sure it’s turned on only if necessary. Some lights won’t make visual difference in VXGI (some times it’ll even make it worse) and if you leave this option turned on it’ll hit your performance unnecessarily.
• Make sure you have enough resolution and distance in your Sunlight’s cascaded shadowmaps settings. Otherwise you’ll get light leaking and poor shadow quality (obviously).
• Remember to set all your lights to movable and turn “Force No Precomputed Lighting” on in your World Settings.

Here are some examples of what you can get with some trial & error and proper light settings:

hi rabellogp

i get this:

https://www.treddi.com/forum/uploads/monthly_2017_12/vxgi_test1.jpg.4758dbbd668b2db6271f0c61288704ce.jpg

how did u get this so perfect corners like in your exemple?
i mean the “connect”. you have the same GI on the roof and on the wall
i get darker GI on the walls for exemple as you can see

what do you think?

your “room” looks like with chamfer on the corner. is it possible? it will change the “light/shadows”?