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LightScenario building places shadows to the wrong level

Hi. I've baked a set of light scenarios (special case of streaming levels) to simulate a day\night cycle with lightmaps and got a problem with shadowmaps. First lighting scenario contains a sun directional light, second contains some point lights.

When I enable world geometry and only first scenario there is no shadows from the sun except culled surfaces alt text

When I enable world geometry with the second scenario it looks okay alt text

And finally, when I enable both scenarios I think I found missing shadows from the first scenario. alt text

There is no other lights except shown in the level. Also I tried to add one more lighting scenario with a different sun placement and it worked fine.

Product Version: UE 4.15
morning_ls.png (501.4 kB)
nightls.png (436.6 kB)
both_ls.png (463.1 kB)
both_ls.png (463.1 kB)
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asked Mar 17 '17 at 09:27 AM in Bug Reports

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avatar image c4tnt Mar 17 '17 at 09:38 AM

Things getting worse - only the last lighting scenario visible while building have correct shadows.

avatar image AndrewHurley Mar 17 '17 at 02:43 PM

Hey c4tnt,

Could you provide me with a list of steps to reproduce this issue on my end? The setup for lighting scenarios should be pretty straight forward, but there are some slightly tricky aspects to getting them to work properly so let me know if you are getting confused when writing out your steps.


Andrew Hurley

avatar image c4tnt Mar 17 '17 at 04:56 PM

It seems light scenarios have only problems with BSP.

  1. Make a little 'persistant level' using BSP brushes

  2. Add two empty sublevels ant toggle them to the light scenario mode

  3. Add a directional light (stationary) to the first one

  4. Add three point lights (stationary) to the second one

  5. Build lightmaps with all sublevels are visible

  6. Check the result - all baked shadows are visible only when last built level is enabled.

avatar image AndrewHurley Mar 26 '17 at 06:21 PM

I believe you are missing a few important steps about lighting scenarios that the attached test project should clarify. You do not want to build all your lightmaps with all the sublevels visible. You want to individually build these separate from one another.

When a Lighting Scenario level is present, lightmap data from all sublevels will be placed inside it so that only the DayScenario lightmaps are loaded when it's daytime. As a result, lightmaps will no longer be streamed by sublevel. This means have a persistent level with the default lighting. Create a sublevel as a lighting scenario, and build that alone with it being the only visible sublevel under the persistent (also should be visible).

I have attached a test project for you to experiment with, to better understand how Lighting Scenarios are meant to be setup. Let me know if you have further questions or need additional assistance.


Andrew Hurley

avatar image c4tnt Mar 27 '17 at 05:33 AM

Sorry, but there is no BSP brushes here. As I tested and wrote in the comments light scenarios work fine with static meshes (even without hiding layers - in 4.15 it is good to build them at once)

I modified your project to show what's wrong with BSP alt text

You can get it here https://yadi.sk/d/KZ2gYLLX3GNGmh

[Added] It is possible to build one light scenario with BSP by hiding all other scenarios, but when trying to build next scenario you'll lost all previously builded shadows.

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1 answer: sort voted first

So I did some digging and found the issue has already been reported.


Once the issue has been addressed by our engineers the ticket will be updated and reflected in the public tracker. Let me know if you have further questions or need additional assistance.


Andrew Hurley

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answered Mar 27 '17 at 02:08 PM

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