# \#swarm **URL:** https://forums.unrealengine.com/tag/swarm/344.md [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) --- ## [\[RELEASED\] Fab Marketplace Niagara VFX Pack: SwarmEffectsFX](https://forums.unrealengine.com/t/released-fab-marketplace-niagara-vfx-pack-swarmeffectsfx/2345515)
**Author:** [@EntropicParallax](https://forums.unrealengine.com/u/EntropicParallax)\ **Replies:** 0\ **Last updated:** [February 19, 2025, 8:10pm UTC](https://forums.unrealengine.com/t/released-fab-marketplace-niagara-vfx-pack-swarmeffectsfx/2345515 "2025-02-19T20:10:17Z")
:rocket: Unreal Engine 5 | Fab Marketplace Pack: SwarmEffectsFX :rocket: \[Show Off\] Hello everyone! We are thrilled to announce the launch of our Unreal Engine project: SwarmEffectsFX! :tada: :small\_blue\_diamond: Swarm… --- ## [Swarm connection issues](https://forums.unrealengine.com/t/swarm-connection-issues/347613)
**Author:** [@anonymous\_user\_d2ea700b](https://forums.unrealengine.com/u/anonymous_user_d2ea700b)\ **Replies:** 2\ **Last updated:** [December 11, 2024, 9:44pm UTC](https://forums.unrealengine.com/t/swarm-connection-issues/347613 "2024-12-11T21:44:02Z")
HI, im having issues with swarm not connecting properly. i can see all agents in the co-coordinator but mostly they wont start when i hit build. or if they do start then they fail almost immediate and disconnect. i can… --- ## [Helix Swarm for Blueprints?](https://forums.unrealengine.com/t/helix-swarm-for-blueprints/2135063)
**Author:** [@DSFL\_Alexander](https://forums.unrealengine.com/u/DSFL_Alexander)\ **Replies:** 0\ **Last updated:** [November 19, 2024, 11:12am UTC](https://forums.unrealengine.com/t/helix-swarm-for-blueprints/2135063 "2024-11-19T11:12:32Z")
I checked the Helix Swarm FAQ and searched the forum bit couldn’t find similar questions. Is it possible to have blueprints in Helix Swarm for reviewing? The review tool inside the engine is cool, however you can not co… --- ## [Mesh Particle Angle Based On Acceleration?](https://forums.unrealengine.com/t/mesh-particle-angle-based-on-acceleration/379586)
**Author:** [@lennysunreal](https://forums.unrealengine.com/u/lennysunreal)\ **Replies:** 1\ **Last updated:** [August 27, 2024, 5:57am UTC](https://forums.unrealengine.com/t/mesh-particle-angle-based-on-acceleration/379586 "2024-08-27T05:57:54Z")
Heyo ^\_^; I have a particle system that is emitting mesh particles. I am trying to get them to angle themselves along their current acceleration or velocity vector. Any ideas on how I might do this? I was thinking I mig… --- ## [Lighting build failed. Swarm failed to kick off](https://forums.unrealengine.com/t/lighting-build-failed-swarm-failed-to-kick-off/287953)
**Author:** [@VladV](https://forums.unrealengine.com/u/VladV)\ **Replies:** 42\ **Last updated:** [May 7, 2024, 2:30pm UTC](https://forums.unrealengine.com/t/lighting-build-failed-swarm-failed-to-kick-off/287953 "2024-05-07T14:30:13Z")
Hello, I have one particular map with this error recently. On Other basic maps the light building works fine. I searched the other similar questions : Try copying your level assets, except the lighting into an anoth… --- ## [Swarm IOException - can't build lightmap](https://forums.unrealengine.com/t/swarm-ioexception-cant-build-lightmap/340421)
**Author:** [@anonymous\_user\_a1d09d07](https://forums.unrealengine.com/u/anonymous_user_a1d09d07)\ **Replies:** 6\ **Last updated:** [March 30, 2024, 7:31am UTC](https://forums.unrealengine.com/t/swarm-ioexception-cant-build-lightmap/340421 "2024-03-30T07:31:10Z")
I am unable to build the lightmap for a map. I have tried multiple times with the exact same result. Just after the scene is exported to Swarm, Swarm throws an IOException claiming it can’t access a cache file because … --- ## [Build lighting from command line](https://forums.unrealengine.com/t/build-lighting-from-command-line/297535)
**Author:** [@Kafumanto](https://forums.unrealengine.com/u/Kafumanto)\ **Replies:** 27\ **Last updated:** [July 31, 2023, 7:05pm UTC](https://forums.unrealengine.com/t/build-lighting-from-command-line/297535 "2023-07-31T19:05:59Z")
Is it possible to build lighting of a map from command line? --- ## [Swarm Coordinator is not coordinating](https://forums.unrealengine.com/t/swarm-coordinator-is-not-coordinating/277363)
**Author:** [@ue4-archive](https://forums.unrealengine.com/u/ue4-archive)\ **Replies:** 34\ **Last updated:** [June 27, 2023, 3:40am UTC](https://forums.unrealengine.com/t/swarm-coordinator-is-not-coordinating/277363 "2023-06-27T03:40:26Z")
I’ve set up Swarm and Coordinator to run with my computer (GOG) and my brother’s (BOB). This is the setup I used on both machines: Apparently it worked. If I hit Network --\> Ping Remote Agents, this is the output (al… --- ## [Swarm Lighting Build Fails in Source Build. "Failed to cache the required dependancy" HELP!](https://forums.unrealengine.com/t/swarm-lighting-build-fails-in-source-build-failed-to-cache-the-required-dependancy-help/793310)
**Author:** [@Kinglumps](https://forums.unrealengine.com/u/Kinglumps)\ **Replies:** 0\ **Last updated:** [March 17, 2023, 11:53pm UTC](https://forums.unrealengine.com/t/swarm-lighting-build-fails-in-source-build-failed-to-cache-the-required-dependancy-help/793310 "2023-03-17T23:53:33Z")
I’ve been trying to build lighting in a source build of UE 5.1 but I keep getting “Lighting Build Failed” after starting the Swarm Connection. I’ve rebuilt UnrealLightmass and followed all the solutions listed at the bot… --- ## [Lightning Build Failed. Swarm Failed to Kick off](https://forums.unrealengine.com/t/lightning-build-failed-swarm-failed-to-kick-off/312824)
**Author:** [@Valachio](https://forums.unrealengine.com/u/Valachio)\ **Replies:** 60\ **Last updated:** [January 16, 2023, 8:11am UTC](https://forums.unrealengine.com/t/lightning-build-failed-swarm-failed-to-kick-off/312824 "2023-01-16T08:11:11Z")
I looked around the forums at other posts and could not find the right solution. This problem happened when update 4.7 came and I created a 4.7 version of the project I was working on (my project used to be in 4.6). Ev… --- ## [Why is SwarmAgent crashing after failing to connect to Swarm?](https://forums.unrealengine.com/t/why-is-swarmagent-crashing-after-failing-to-connect-to-swarm/279058)
**Author:** [@anonymous\_user\_a1fbd4ca](https://forums.unrealengine.com/u/anonymous_user_a1fbd4ca)\ **Replies:** 16\ **Last updated:** [August 22, 2022, 11:27am UTC](https://forums.unrealengine.com/t/why-is-swarmagent-crashing-after-failing-to-connect-to-swarm/279058 "2022-08-22T11:27:05Z")
I am currently unable to build lighting in any of my projects or maps. It stops at 0:00:00 Starting up Swarm Connection… (98%) with the error message “Failed to connect to Swarm”. I have tried disabling the Windows fire… --- ## [Light Complexity does not work, and static lights will not bake.](https://forums.unrealengine.com/t/light-complexity-does-not-work-and-static-lights-will-not-bake/415363)
**Author:** [@anonymous\_user\_1c1a6b95](https://forums.unrealengine.com/u/anonymous_user_1c1a6b95)\ **Replies:** 3\ **Last updated:** [July 7, 2022, 11:36am UTC](https://forums.unrealengine.com/t/light-complexity-does-not-work-and-static-lights-will-not-bake/415363 "2022-07-07T11:36:37Z")
Hello, I’m currently using Unreal 4.19 Preview and I’m unable to use the Light Complexity Optimisation view mode. When I go to the view mode everything in the scene is displayed as being black, even though I several lig… --- ## [SwarmAgent stopping with error](https://forums.unrealengine.com/t/swarmagent-stopping-with-error/357080)
**Author:** [@dluchau](https://forums.unrealengine.com/u/dluchau)\ **Replies:** 7\ **Last updated:** [May 19, 2022, 10:29pm UTC](https://forums.unrealengine.com/t/swarmagent-stopping-with-error/357080 "2022-05-19T22:29:22Z")
Hi, I’m trying to build lighting for my project with 5249 unbuilt objects with “Preview” quality and lightmap res set to 4 on all foliage. I’ve built lightning successfully many times in this project before, but when t… --- ## [Swarm failed to kick off. The process cannot access the file](https://forums.unrealengine.com/t/swarm-failed-to-kick-off-the-process-cannot-access-the-file/365964)
**Author:** [@Raghu](https://forums.unrealengine.com/u/Raghu)\ **Replies:** 10\ **Last updated:** [April 26, 2022, 4:34pm UTC](https://forums.unrealengine.com/t/swarm-failed-to-kick-off-the-process-cannot-access-the-file/365964 "2022-04-26T16:34:21Z")
1:45:25 PM: \[Interface:TryOpenConnection\] Local connection established 1:45:25 PM: \[Job\] Accepted Job 8D6ABE68-455CF99C-92AF0D89-03B3A6BA 1:46:09 PM: \[Interface:OpenChannel\] Error: System.IO.IOException: The process ca… --- ## [Swarm performance using old servers](https://forums.unrealengine.com/t/swarm-performance-using-old-servers/504072)
**Author:** [@ZoguBK](https://forums.unrealengine.com/u/ZoguBK)\ **Replies:** 0\ **Last updated:** [March 4, 2022, 4:25pm UTC](https://forums.unrealengine.com/t/swarm-performance-using-old-servers/504072 "2022-03-04T16:25:14Z")
Hi, For the purpose of speeding up light building we got 2 used servers with 2 Xeon E5-2695 V2 (12 core 24 threads) processors each. Beside them we have also 2 desktops with i9-11900F (8 cores 16 threads). Every mach… --- ## [Swarm Crashes - Can't restore old settings](https://forums.unrealengine.com/t/swarm-crashes-cant-restore-old-settings/403977)
**Author:** [@Jambax](https://forums.unrealengine.com/u/Jambax)\ **Replies:** 6\ **Last updated:** [February 18, 2022, 10:04am UTC](https://forums.unrealengine.com/t/swarm-crashes-cant-restore-old-settings/403977 "2022-02-18T10:04:23Z")
I tried setting up distributed lighting builds for my system, and now I can’t build anything (even If I disable distribution). Here are my settings (both PC’s have identical settings and are connected via LAN). Unfor… --- ## [Swarm Agent error - "Configuration System failed to initialize" - 4.27.2](https://forums.unrealengine.com/t/swarm-agent-error-configuration-system-failed-to-initialize-4-27-2/498126)
**Author:** [@Raging\_Paper-Cut](https://forums.unrealengine.com/u/Raging_Paper-Cut)\ **Replies:** 0\ **Last updated:** [February 15, 2022, 2:17am UTC](https://forums.unrealengine.com/t/swarm-agent-error-configuration-system-failed-to-initialize-4-27-2/498126 "2022-02-15T02:17:04Z")
Hello, I am running into an issue with the UE4 editor - specifically the Swarm Agent. This happens when trying to build my level or do any type of lighting build. The UE4 editor gets to “starting Swarm agent” then freez… --- ## [Swarmagent.exe as windows service?](https://forums.unrealengine.com/t/swarmagent-exe-as-windows-service/399051)
**Author:** [@dfk1976](https://forums.unrealengine.com/u/dfk1976)\ **Replies:** 1\ **Last updated:** [February 2, 2022, 3:51pm UTC](https://forums.unrealengine.com/t/swarmagent-exe-as-windows-service/399051 "2022-02-02T15:51:38Z")
Is it possible to run swarmagent.exe as a windows service wich starts as process without a user login? Or could this possibly done with windows task manager to create a task when the system starts? Any experiences or ide… --- ## [Error "Failed to initialize Swarm. Check to make sure you have the right version of Swarm installed." when trying to build the lighting of my project](https://forums.unrealengine.com/t/error-failed-to-initialize-swarm-check-to-make-sure-you-have-the-right-version-of-swarm-installed-when-trying-to-build-the-lighting-of-my-project/479570)
**Author:** [@CesarMolto](https://forums.unrealengine.com/u/CesarMolto)\ **Replies:** 1\ **Last updated:** [November 16, 2021, 3:14pm UTC](https://forums.unrealengine.com/t/error-failed-to-initialize-swarm-check-to-make-sure-you-have-the-right-version-of-swarm-installed-when-trying-to-build-the-lighting-of-my-project/479570 "2021-11-16T15:14:03Z")
Recently I built the 4.24.3 version of UE from source to work on a project that requires some modifications in the source code. The problem is that every time I try to build the lighting the following error pops up “Fail… --- ## [Lights won't build but SwarmAgent launches](https://forums.unrealengine.com/t/lights-wont-build-but-swarmagent-launches/490931)
**Author:** [@DriesBatens](https://forums.unrealengine.com/u/DriesBatens)\ **Replies:** 0\ **Last updated:** [November 15, 2021, 1:22pm UTC](https://forums.unrealengine.com/t/lights-wont-build-but-swarmagent-launches/490931 "2021-11-15T13:22:43Z")
Hi, I got a problem with my project that my lights won’t build in the project. I use Unreal Engine 4.26. On the other hand, I do see in SwarmAgent that a process is being carried out in this. When this process is compl… --- ## [Swarm fails to Kick off 4.2](https://forums.unrealengine.com/t/swarm-fails-to-kick-off-4-2/489870)
**Author:** [@CelticKnight](https://forums.unrealengine.com/u/CelticKnight)\ **Replies:** 0\ **Last updated:** [October 14, 2021, 12:52pm UTC](https://forums.unrealengine.com/t/swarm-fails-to-kick-off-4-2/489870 "2021-10-14T12:52:45Z")
Hello all, I am trying the remove the message “Lighting needs to be rebuilt” in the FPS Shooter template project in 4.27. Firstly, I click in the Build option -\>Building Lighting only and then receive the message: Li… --- ## [Lighting build instantly fails with no error in output log](https://forums.unrealengine.com/t/lighting-build-instantly-fails-with-no-error-in-output-log/488719)
**Author:** [@0land0](https://forums.unrealengine.com/u/0land0)\ **Replies:** 0\ **Last updated:** [September 13, 2021, 2:28pm UTC](https://forums.unrealengine.com/t/lighting-build-instantly-fails-with-no-error-in-output-log/488719 "2021-09-13T14:28:57Z")
When I try to build my lighting, it immediately fails with no error in the output log. Checking the Swarm Agent log says: 6:10:30 PM: Starting up SwarmAgent ... 6:10:30 PM: ... registering SwarmAgent with remoting se… --- ## [Swarm Kikcoff problem](https://forums.unrealengine.com/t/swarm-kikcoff-problem/486017)
**Author:** [@mrtthekid](https://forums.unrealengine.com/u/mrtthekid)\ **Replies:** 0\ **Last updated:** [July 10, 2021, 11:54am UTC](https://forums.unrealengine.com/t/swarm-kikcoff-problem/486017 "2021-07-10T11:54:37Z")
I’ve been trying to build my game for 10 days, I’ve re-installed 4.26, downloaded UE4.sln… ran UnrealLightmass, Exported map to other project, decreased amounts of objects. Here how it went: I could render in 3 hours … --- ## [Cannot kick off swarm for unreal tournament](https://forums.unrealengine.com/t/cannot-kick-off-swarm-for-unreal-tournament/405818)
**Author:** [@anonymous\_user\_a5cd030c1](https://forums.unrealengine.com/u/anonymous_user_a5cd030c1)\ **Replies:** 3\ **Last updated:** [July 7, 2021, 1:16am UTC](https://forums.unrealengine.com/t/cannot-kick-off-swarm-for-unreal-tournament/405818 "2021-07-07T01:16:57Z")
I have a 4.14 version of UE4 and a Unreal Tournament.Both are built from source. UE4 works fine.But UT gives me an error said the swarm cannot kick off . The weird thing is UT actually can start the swarm agent, I can f… --- ## [Swarm CPU/Core/Thread Limit](https://forums.unrealengine.com/t/swarm-cpu-core-thread-limit/303734)
**Author:** [@LeFxGuy](https://forums.unrealengine.com/u/LeFxGuy)\ **Replies:** 3\ **Last updated:** [April 28, 2021, 6:43pm UTC](https://forums.unrealengine.com/t/swarm-cpu-core-thread-limit/303734 "2021-04-28T18:43:16Z")
Dear Epic, dear Community, I wanted to ask if there is a Limit on the amount of CPUs/Cores that Swarm can use? To be more precise: (1) is there a limit on swarm agent clients? (2) Did anyone try a dual socket machine… --- ## [Swarm Agent Error:This operation is currently limited to supporting files less than 2 gigabytes in size](https://forums.unrealengine.com/t/swarm-agent-error-this-operation-is-currently-limited-to-supporting-files-less-than-2-gigabytes-in-size/481845)
**Author:** [@Levantail](https://forums.unrealengine.com/u/Levantail)\ **Replies:** 0\ **Last updated:** [April 13, 2021, 3:18pm UTC](https://forums.unrealengine.com/t/swarm-agent-error-this-operation-is-currently-limited-to-supporting-files-less-than-2-gigabytes-in-size/481845 "2021-04-13T15:18:06Z")
Hello, I was working on my project and suddenly from some point when i try to build static lighting I get this in UE4 Output log: MapCheck: Error: WorldSettings\_1 Maps need lighting rebuilt And swarm log: 4:3… --- ## [Swarm Agent - Failed to cache the executable](https://forums.unrealengine.com/t/swarm-agent-failed-to-cache-the-executable/351770)
**Author:** [@Metathesus](https://forums.unrealengine.com/u/Metathesus)\ **Replies:** 2\ **Last updated:** [April 1, 2021, 9:25am UTC](https://forums.unrealengine.com/t/swarm-agent-failed-to-cache-the-executable/351770 "2021-04-01T09:25:33Z")
Hello, I can’t build light. Here the log of the swarm agent 18:54:23: \[Interface:TryOpenConnection\] Local connection established 18:54:26: \[Job\] Accepted Job C0183CE7-4F8EDA92-956A0D92-6CD6D252 18:54:28: \[Interface:Ca… --- ## [Build hangs 90 seconds before starting](https://forums.unrealengine.com/t/build-hangs-90-seconds-before-starting/479308)
**Author:** [@FunAndFriendly](https://forums.unrealengine.com/u/FunAndFriendly)\ **Replies:** 1\ **Last updated:** [March 4, 2021, 3:10am UTC](https://forums.unrealengine.com/t/build-hangs-90-seconds-before-starting/479308 "2021-03-04T03:10:56Z")
Hi, I’m having issues with the swarm. When I click “Build”, it hangs on this dialog for 90 seconds (using a timer). Then it builds the lighting. Occasionally, if I click “Build” again relatively soon (5-10 seconds), I… --- ## [Why can't I build lighting?](https://forums.unrealengine.com/t/why-cant-i-build-lighting/476917)
**Author:** [@o0.Charon.0o](https://forums.unrealengine.com/u/o0.Charon.0o)\ **Replies:** 2\ **Last updated:** [February 24, 2021, 8:57pm UTC](https://forums.unrealengine.com/t/why-cant-i-build-lighting/476917 "2021-02-24T20:57:03Z")
So I’m trying to build lighting and it keeps giving me these two errors: The first one is a map check error and it says: WorldSettings\_1 Maps need lighting rebuilt And the other one says: === Lightmass crashed: === A… --- ## [Build error](https://forums.unrealengine.com/t/build-error/357395)
**Author:** [@anonymous\_user\_23a653b0](https://forums.unrealengine.com/u/anonymous_user_23a653b0)\ **Replies:** 10\ **Last updated:** [December 14, 2020, 8:19pm UTC](https://forums.unrealengine.com/t/build-error/357395 "2020-12-14T20:19:17Z")
Hello I am a new user to your engine so I am sorry for my lack of knowledge I am in the first attempt in building a level for a game that I will be working on and learning (from youtube, UE vault, friends) when I save th… [Next page](https://forums.unrealengine.com/tag/swarm/344.md?match_all_tags=true&page=1&tags%5B%5D=swarm)