[Error] "Maps need lighting rebuilt."

[anonymous_user_872437f2]

Goat is right. Just set target in VS or Xcode to UnrealLightMass > My Mac, then go back to Unreal and Build and this problem is revolved.

[ouerkaka]

@GoatOfDeath;667377

I just rebuilt unreallightmass in VS and sorted

Thanks,only your method works for me.I’m using 4.16 with nvidia gameworks,and the problem solved.

[jdannenbring]

@GoatOfDeath;667377

I just rebuilt unreallightmass in VS and sorted

Yes! This fixed for me too (4.14)

[anonymous_user_00661f2e]

@GoatOfDeath

I just rebuilt unreallightmass in VS and sorted

Help??? What is VS? How hard is for someone who knows how to solve this problem to just gives two-thee steps???

I am frustrated 1/2 of the problem and the rest from this tread.

Please, someone who actually can help?

[JaroMast]

@anonymous_user_00661f2e

Help??? What is VS? How hard is for someone who knows how to solve this problem to just gives two-thee steps???

I am frustrated 1/2 of the problem and the rest from this tread.

Please, someone who actually can help?

VS is Visual Studio. You will need to:

1. If you don’t have sln file project then Right click on your uproject and generate Visul Studio project files.
2. Open sln file.
3. In Visual Studio check for Programs directory.
4. Right click on UnrealLightmass project and select Rebuild

[canarikal]

Is this can be also that problem’s solve; https://answers.unrealengine/questions/736775/cant-build-my-level-lighting.html
I’m suffering, please help

[Pweazle]

I had suffered this problem from foliage, InstancedStaticMeshComponents as well.
However have found a solution to fix it in 4.7.6.

1. Open ‘World Settings’.
2. Goto ‘Lightmass’ category.
3. Check ‘Force No Precomputed Lighting’.
4. A popup will appear. Press ‘OK’.
5. Press ‘Build All’ or ‘Build Lighting Only’. Static Lighting will be crack. That’s OK.
6. Save the map.
7. Reload the map. Open another map and open the map or double click the map in content browser.
8. Lightmaps will be 0 in Lightmass categoty. If not, load the map again.
9. Uncheck ‘Force No Precomputed Lighting’.
10. Save the map.
11. Press ‘Build All’ or ‘Build Lighting Only’.
12. Solved.

You just saved my butt. Thank you!

[trozt]

@juxus1

its stupid perhaps but since i’m new to unity i’m having problems with your point

6. Save the map.
7. Reload the map. Open another map and open the map or double click the map in content browser.

how and where do i save a map. what is a map. i’m almost there… please help

just in case you misspelled Unreal Engine XD, the maps are saved in your content browser, are tagged with a yellow color, in the picture i have the levels filteres in ALL my content directory. in order to reopen a level just double click it or open another one ande then go back to the original.

[waynechriss]

I had suffered this problem from foliage, InstancedStaticMeshComponents as well.
However have found a solution to fix it in 4.7.6.

1. Open ‘World Settings’.
2. Goto ‘Lightmass’ category.
3. Check ‘Force No Precomputed Lighting’.
4. A popup will appear. Press ‘OK’.
5. Press ‘Build All’ or ‘Build Lighting Only’. Static Lighting will be crack. That’s OK.
6. Save the map.
7. Reload the map. Open another map and open the map or double click the map in content browser.
8. Lightmaps will be 0 in Lightmass categoty. If not, load the map again.
9. Uncheck ‘Force No Precomputed Lighting’.
10. Save the map.
11. Press ‘Build All’ or ‘Build Lighting Only’.
12. Solved.

This did not work for me. I dunno what ‘Static Lighting will be crack’ means other than when I did step 5, the light build failed instantaneously.

[waynechriss]

@JaroMast

VS is Visual Studio. You will need to:

1. If you don’t have sln file project then Right click on your uproject and generate Visul Studio project files.
2. Open sln file.
3. In Visual Studio check for Programs directory.
4. Right click on UnrealLightmass project and select Rebuild

So what happens when there is no “Programs directory” in the sln file? I can’t rebuild in VS because my sln file is missing that directory that contains unreallightmass.cpp

[morieris]

Just got this problem, but from a different cause. I was running with a source-built engine, but hadn’t also built Lightmass from source. Building lightmass fixed the issue for me. Necroposting so that I can find this answer when I inevitably have this same issue again a couple months from now.

[alex52b]

Try to change light source (directional light) stationary–>Movable

[anonymous_user_8e576a5c]

@alex52b

Try to change light source (directional light) stationary–>Movable

First post. Solved all my problems. Now I can go to sleep.
Wow. Not all heroes wear capes.

[SamTheGodOfWar]

It just works when you delete your intermediate folder.

[anonymous_user_a183883b]

Maybe this tip will help somebody: I also always had the same message (Light build failed. Swarm Agent failed to kick off) in a map with several light sources, foliage and many static meshes with partly self created materials. At some point I noticed that I still had an object consisting of brushes (created with Add and Substract) in the map, which looked like a static mesh at first sight. I converted the brush into a static mesh and deleted the brushes. And everything was fine again.

[mrsalomaoo]

I had suffered this problem from foliage, InstancedStaticMeshComponents as well.
However have found a solution to fix it in 4.7.6.

1. Open ‘World Settings’.
2. Goto ‘Lightmass’ category.
3. Check ‘Force No Precomputed Lighting’.
4. A popup will appear. Press ‘OK’.
5. Press ‘Build All’ or ‘Build Lighting Only’. Static Lighting will be crack. That’s OK.
6. Save the map.
7. Reload the map. Open another map and open the map or double click the map in content browser.
8. Lightmaps will be 0 in Lightmass categoty. If not, load the map again.
9. Uncheck ‘Force No Precomputed Lighting’.
10. Save the map.
11. Press ‘Build All’ or ‘Build Lighting Only’.
12. Solved.

You is amazing man!!
In my case everything works until here (step 12)

But…

when the engine finishes the illumination build (swarm step) and try “import build light static”, the engine crashs and the program closes
automatically

Someone Help me please!
I need to go back sleep haha

[waynechriss]

I had suffered this problem from foliage, InstancedStaticMeshComponents as well.
However have found a solution to fix it in 4.7.6.

1. Open ‘World Settings’.
2. Goto ‘Lightmass’ category.
3. Check ‘Force No Precomputed Lighting’.
4. A popup will appear. Press ‘OK’.
5. Press ‘Build All’ or ‘Build Lighting Only’. Static Lighting will be crack. That’s OK.
6. Save the map.
7. Reload the map. Open another map and open the map or double click the map in content browser.
8. Lightmaps will be 0 in Lightmass categoty. If not, load the map again.
9. Uncheck ‘Force No Precomputed Lighting’.
10. Save the map.
11. Press ‘Build All’ or ‘Build Lighting Only’.
12. Solved.

This does not work for me, not sure how its working for everyone else. I still have the same error despite following these steps, verbatim.

[AzureDreamStudio]

@waynechriss

This does not work for me, not sure how its working for everyone else. I still have the same error despite following these steps, verbatim.

For me it’s worse! I am now forced to re-compile everything that had already been compiled. 18,937 items to be recompiled.

[Krako (Hello there)]

@alex52b

Try to change light source (directional light) stationary–>Movable

Thank you.

Engine Version: 4.26

[anonymous_user_5f04efe81 (anonymous_user_5f04efe8)]

how to save the map ??