Hello,
I’m having trouble blocking the light from a directional light source. I’m working with Lumen and tried blocking it with different static meshes, default cube etc. Meshes cast shadows correctly but I can see my light source as a shiny dot when I’m looking from the other side.
Any help is appreciated.
Update: Setting Volumetric Scattering Intensity to 0 fixed this issue for me. Might be helpful for other people.
To my knowledge, this should not be happenning with Volumetric Scattering Intensity either. Something different might be happenning. About mesh or material or post process maybe…
I might be doing something wrong but that volumetric scattering setting fixed it in this instance.
Shouldn’t be happening but generally speaking everything in engine needs to be set up to light block.
You can’t put in a single sided sheet and expect it to work.
You’ll get light leaks or a bunch of different issues all the time.
Suggest object thickness to avoid issues is between 1cm and 5cm. (which is the same as UU)
@MostHost_LA yes that might be the thing. But volumetric scattering still solves this? Would be interesting. Anyway, if you see some other problem in your project that you are troubling to deal with, ask to community again. Keep the developing runnin
Partially, because it’s volumetric and the volume of a plane when calculated is obviously not a 2d plane but a 3d “volume” of some sort…
Actually tried to block with different kinds of objects and meshes, a 20m cube, some static meshes with two sided materials etc… Couldn’t block with any of them. For now that setting seems to solve my issue. Thanks a lot for your insights.
Afaik,
This should not be happening with any of the scenarios you listed above regardless of the setting.
You may have accidentally triggerd some other engine setting or similar.
If your project/level is not too far into development.
Stop.
Make a new level.
Check that light works as intended in the new level - with and without that setting.
If it does, move your meshes and things to the new level via copy paste - making sure not to select anything but meshes and game blueprints necessary to the level.
Test again.
If the issue is back then some object you moved over is at fault.
If it all works, save the level, delete the old one, and you can keep working knowing the issue was some random settting / making sure not to toggle stuff around without writing down the steps you take 
Oh,
If the light does not work right in the new level, then you know you are dealing with an engine setting.
Those are Project dependent, so you could move everything to a new peoject, but its probably easier to overwrite your engine INI with that of a clean project where light works correctly…
Thanks for your detailed answer. Right now I’m in 7-8 months deep in this project but I’ll try to migrate some assets to a new project, then try it out like you said and see how it works.
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