Summary
Hi,
I’m unable to build HLODs in UE 5.6.1 and higher. Trying to build HLODs in world partition map via Build > Build HLODs results in “freeze”.
Please select what you are reporting on:
Creative
What Type of Bug are you experiencing?
World Building
Steps to Reproduce
Build > Build HLODs, as normally.
Also tried with with script for building HLODs to get rid of all GUI elements.
The progress bar is animated, so it’s responding, but nothing is happening for multiple hours (8h was the longest). It gets stuck on random texture, material or while trying to generate first HLOD.
Tried to disable most things from HLODs - the same.
Created new map in the project - same.
Created new project with new map - same.
Uninstalled engine, cleared cashes and download folder, installed again, created new project - same.
Updated all drivers - same.
The project has world partition enabled.
Expected Result
Building HLODs. It always takes time, but if there’s no problem in 8h, there’s something wrong with - especially that others in my team are unable to build them as well.
Previously, I was able to build HLODs in version 5.4.4. multiple times and in multiple projects.
Observed Result
As mentioned in results, I tried to build HLODs in multiple ways, even on the empty map, but it gets stuck on random thing.
While using script and trying to build HLODs in project it sometimes freezes on one random texture or material. Only one time out of 50 (?) i tried to build HLODs, an actual error showed up:
[2026.01.26-12.21.02:938][ 11]LogTexture: Display: Waiting for textures to be ready 2 519/2 520 (/Game/ProjectPreasidium/Art/Assets/Props/CoffeeSet/T_CoffeeSet_ORM) …
[2026.01.26-12.24.11:663][ 11]LogShaderCompilers: Error: SCW 10 Queued Jobs, Finished 12 single jobs
[2026.01.26-12.24.11:664][ 11]LogShaderCompilers: Error: Job 0 [Single] Failed: BaseColor_857326c81676f519/Default/FLocalVertexFactory/FDebugViewModePS/0:/Engine/Private/DebugViewModePixelShader.usf|Main VF ‘FLocalVertexFactory’ Type ‘FDebugViewModePS’ ‘/Engine/Private/DebugViewModePixelShader.usf’ Entry ‘Main’ Permutation 0
[2026.01.26-12.24.11:665][ 11]LogShaderCompilers: Error: Job 1: Pipeline VelocityPipeline
[2026.01.26-12.24.11:666][ 11]LogShaderCompilers: Error: PipelineJob 0 Failed: MM_Props_b58c311c47481635/Default/VelocityPipeline/FInstancedStaticMeshVertexFactory/FVelocityPS/0:/Engine/Private/VelocityShader.usf|MainPixelShader VF ‘FInstancedStaticMeshVertexFactory’ Type ‘FVelocityPS’ ‘/Engine/Private/VelocityShader.usf’ Entry ‘MainPixelShader’ Permutation 0
[2026.01.26-12.24.11:666][ 11]LogShaderCompilers: Error: PipelineJob 1 Failed: MM_Props_b58c311c47481635/Default/VelocityPipeline/FInstancedStaticMeshVertexFactory/FVelocityVS/0:/Engine/Private/VelocityShader.usf|MainVertexShader VF ‘FInstancedStaticMeshVertexFactory’ Type ‘FVelocityVS’ ‘/Engine/Private/VelocityShader.usf’ Entry ‘MainVertexShader’ Permutation 0
[2026.01.26-12.24.11:667][ 11]LogShaderCompilers: Error: Job 2 [Single] Failed: RL_Standard_Opacity_1fb5a92b0b0f064b/Default/TGPUSkinAPEXClothVertexFactoryDefault/TBasePassPSFSelfShadowedCachedPointIndirectLightingPolicy/0:/Engine/Private/BasePassPixelShader.usf|MainPS VF ‘TGPUSkinAPEXClothVertexFactoryDefault’ Type ‘TBasePassPSFSelfShadowedCachedPointIndirectLightingPolicy’ ‘/Engine/Private/BasePassPixelShader.usf’ Entry ‘MainPS’ Permutation 0
[2026.01.26-12.24.11:667][ 11]LogShaderCompilers: Error: Job 3 [Single] Failed: MM_ThinTranslucent_6460c3780cff0db2/Default/FLocalVertexFactory/TBasePassVSFSelfShadowedVolumetricLightmapPolicy/0:/Engine/Private/BasePassVertexShader.usf|Main VF ‘FLocalVertexFactory’ Type ‘TBasePassVSFSelfShadowedVolumetricLightmapPolicy’ ‘/Engine/Private/BasePassVertexShader.usf’ Entry ‘Main’ Permutation 0
[2026.01.26-12.24.11:668][ 11]LogShaderCompilers: Error: Job 4 [Single] Failed: M_Master_Glass_d9856729852250b6/Default/FInstancedStaticMeshVertexFactory/TBasePassPSFPrecomputedVolumetricLightmapLightingPolicy/0:/Engine/Private/BasePassPixelShader.usf|MainPS VF ‘FInstancedStaticMeshVertexFactory’ Type ‘TBasePassPSFPrecomputedVolumetricLightmapLightingPolicy’ ‘/Engine/Private/BasePassPixelShader.usf’ Entry ‘MainPS’ Permutation 0
[2026.01.26-12.24.11:668][ 11]LogShaderCompilers: Error: Job 5 [Single] Failed: M_Master_Glass_d9856729852250b6/Default/FInstancedStaticMeshVertexFactory/TBasePassPSFSelfShadowedCachedPointIndirectLightingPolicySkylight/0:/Engine/Private/BasePassPixelShader.usf|MainPS VF ‘FInstancedStaticMeshVertexFactory’ Type ‘TBasePassPSFSelfShadowedCachedPointIndirectLightingPolicySkylight’ ‘/Engine/Private/BasePassPixelShader.usf’ Entry ‘MainPS’ Permutation 0
[2026.01.26-12.24.11:669][ 11]LogShaderCompilers: Error: Job 6 [Single] Failed: M_Master_Standard_c7f3696471205bbe/Default/FInstancedStaticMeshVertexFactory/TBasePassVSTLightMapPolicyHQ/0:/Engine/Private/BasePassVertexShader.usf|Main VF ‘FInstancedStaticMeshVertexFactory’ Type ‘TBasePassVSTLightMapPolicyHQ’ ‘/Engine/Private/BasePassVertexShader.usf’ Entry ‘Main’ Permutation 0
[2026.01.26-12.24.11:669][ 11]LogShaderCompilers: Error: Job 7 [Single] Failed: M_smoke_subUV_3fff1739b57bf414/Default/FNiagaraSpriteVertexFactory/TBasePassPSFNoLightMapPolicy/0:/Engine/Private/BasePassPixelShader.usf|MainPS VF ‘FNiagaraSpriteVertexFactory’ Type ‘TBasePassPSFNoLightMapPolicy’ ‘/Engine/Private/BasePassPixelShader.usf’ Entry ‘MainPS’ Permutation 0
[2026.01.26-12.24.11:670][ 11]LogShaderCompilers: Error: Job 8 [Single] Failed: MM_PropsWithDetail_6ec3d40ea6f438cc/Default/FInstancedStaticMeshVertexFactory/TBasePassPSFPrecomputedVolumetricLightmapLightingPolicySkylight/0:/Engine/Private/BasePassPixelShader.usf|MainPS VF ‘FInstancedStaticMeshVertexFactory’ Type ‘TBasePassPSFPrecomputedVolumetricLightmapLightingPolicySkylight’ ‘/Engine/Private/BasePassPixelShader.usf’ Entry ‘MainPS’ Permutation 0
[2026.01.26-12.24.11:670][ 11]LogShaderCompilers: Error: Job 9: Pipeline VelocityPipeline
[2026.01.26-12.24.11:671][ 11]LogShaderCompilers: Error: PipelineJob 0 Failed: MM_PropsWithDetail_6ec3d40ea6f438cc/Default/VelocityPipeline/FInstancedStaticMeshVertexFactory/FVelocityPS/0:/Engine/Private/VelocityShader.usf|MainPixelShader VF ‘FInstancedStaticMeshVertexFactory’ Type ‘FVelocityPS’ ‘/Engine/Private/VelocityShader.usf’ Entry ‘MainPixelShader’ Permutation 0
[2026.01.26-12.24.11:671][ 11]LogShaderCompilers: Error: PipelineJob 1 Failed: MM_PropsWithDetail_6ec3d40ea6f438cc/Default/VelocityPipeline/FInstancedStaticMeshVertexFactory/FVelocityVS/0:/Engine/Private/VelocityShader.usf|MainVertexShader VF ‘FInstancedStaticMeshVertexFactory’ Type ‘FVelocityVS’ ‘/Engine/Private/VelocityShader.usf’ Entry ‘MainVertexShader’ Permutation 0
[2026.01.26-12.24.11:674][ 11]LogShaderCompilers: Error: ShaderCompileWorker failed
Crash inside the platform compiler:
Hard to tell if this is even related to what’s happening, because it showed up ONLY ONE TIME. I checked mentioned materials and either deleted them or removed them from the scene.
Around 6 out of 10 times it freezes on building first HLOD and stays like that with no progress.
I asked colleague from the project to build HLODs, but had the same problem as I have.
Previously, building HLODs work perfectly fine on 5.4.4., but we moved to 5.6.1.
Platform(s)
Windows 10 and 11, checked in UE 5.6.1 and 5.7 - same results. Works fine in 5.5 and 5.4.4
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Additional Notes
My setup:
AMD Ryzen 5 5600X
32 GB RAM + pagefile 64 GB
GeForce RTX 3070 Ti 8 GB VRAM
Over 100 free disk space on all disks.