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How to compile lightmass?

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    How to compile lightmass?

    Hello everytime I am trying to build my light, it comes an error called: " Lightning build failed. Swarm failed to kick off. Compile Unreal Lightmass. " Can you help me how I can change this?

    #2
    Do you build the engine from source? If so, you have to recompile the Lightmass module (as the error suggests).

    EDIT:
    Open the engine solution in Visual Studio and search for UnrealLightmass, then right click: build.
    Click image for larger version

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    Last edited by Kontur; 06-26-2017, 09:42 AM.

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      #3
      I get this same error (doesn't matter what level I try to build, even the default "blank one" with just a floor.)

      I rebuilt Unreal Lightmass a half dozen times now, restarted PC, and nothing seems to work.

      I've also tried everything in the forum post about steps to fix Swarm not starting.

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        #4
        Do you download your UE4 from the launcher or github ?

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          #5
          Originally posted by EkstraReality View Post
          Do you download your UE4 from the launcher or github ?
          Github and built whole source.

          I'm running as Debug Editor if that matters.
          Last edited by Slayer9292; 07-04-2017, 02:00 AM.

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            #6
            Ok do you tr to make a new clean intallation maybe ?
            And try maybe with Development Editor instead ?

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              #7
              FYI, Development Editor worked.

              I was going to try that next, but needed a point where I could waste an hour or so building.

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                #8
                Originally posted by Kontur View Post
                Do you build the engine from source? If so, you have to recompile the Lightmass module (as the error suggests).

                EDIT:
                Open the engine solution in Visual Studio and search for UnrealLightmass, then right click: build.
                It doesn't show up when i search for it. I already verified the engine. I got it from the launcher. It did work yesterday and now it doesnt :l

                EDIT: A mesh was causing the problem. Reimplementing it helped out
                Last edited by Danjio; 08-10-2017, 07:55 AM.

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                  #9
                  Bcs of copyright Infringement... GitHub has removed UE4 every links.

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                    #10
                    Originally posted by Loucou View Post
                    Bcs of copyright Infringement... GitHub has removed UE4 every links.
                    No they haven't?

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                      #11
                      Originally posted by Kontur View Post
                      Do you build the engine from source? If so, you have to recompile the Lightmass module (as the error suggests).

                      EDIT:
                      Open the engine solution in Visual Studio and search for UnrealLightmass, then right click: build.
                      [ATTACH=CONFIG]146371[/ATTACH]
                      this worked for me when i had a light build failed to kick off compile light mass error. thank you!

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                        #12
                        I'm having this same issue and the UnrealLightmass file isn't showing up in VS2017. Someone wanna give me a hand?

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                          #13
                          Just for info: Using VS2017 with source built UE4.21.2, found UnrealLightmass module, and building it resolved the error. Thanks!

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                            #14
                            I build the ue4.24.3 from the github source code with the Development Editor option .I have the same problem and compile the
                            UnrealLightmass.It works.

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