Topics tagged lightmass-crash

Topic	Replies	Views	Activity
5.7 Lightmass Issues (Crashes and Bugs) Rendering question , Lightmass , unreal-engine , lightmass-crash	0	68	January 26, 2026
lightmass crashing Programming & Scripting question , Lightmass , Rendering , unreal-engine , Lightmap , lightmass-crash	10	256	January 3, 2026
Tutorial: Fix GPU Lightmass Crashes in Unreal Engine 5 – Find Problematic Assets Automatically! Tutorial & Course Discussions Lighting , Lightmass , unreal-engine , lightmass-crash	0	267	July 4, 2025
Fails to build lighting. Lightmass crashed Rendering question , unreal-engine , lightmass-crash	1	490	June 27, 2025
Lightmass static lightning timed-out, asserts mismatch in task counting Rendering UE4-23 , question , unreal-engine , Lightmap , assertion-failed , lightmass-crash , static-lighting	5	1671	October 2, 2024
Swarm agent. [Interface:OpenJob] Error: Not found / Failed to build lighting! Lighting build failed Rendering question , Lighting , unreal-engine , lightmass-crash , UE5-0	4	884	July 2, 2024
Lightmass Crashing Rendering question , crash , Lightmass , error , unreal-engine , lighting-build , lightmass-crash	4	1681	April 14, 2024
I'm getting an error regarding 0xc000012f Unreallightmass.exe - Bad image Rendering question , Lightmass , error , unreal-engine , lightmass-crash	3	1545	October 4, 2023
Lightmass crashed: ===Unhandled Exception: EXCEPTION_INT_DIVIDE_BY_ZERO Rendering question , unreal-engine , lightmass-crash	8	3790	June 8, 2023
Lightmass crashed version 27.2 - GPU Rendering question , Lightmass , unreal-engine , lightmass-crash , ue4-crash	0	298	May 22, 2023
UE5 - CPU Lightmass: Assertion failed: BlendMode Rendering Lightmass , Rendering , unreal-engine , lightmass-crash	4	879	March 28, 2023
Lightmass broken in 5.1 and 5.1.1 on mac. Rendering MAC , unreal-engine , lightmass-crash	2	465	March 23, 2023
UE5.1 Editor crash on Lightmass build: Assertion failed in NaniteMaterials.h Rendering question , Lightmass , unreal-engine , baked-lighting , assertion-failed , lightmass-crash , UE-5	0	896	January 11, 2023
When I move dynamic light I get Black landscape and lighting breaks. Rendering question , dynamic-lighting , unreal-engine , lightmass-crash , UE5-1	0	287	November 21, 2022
Lightmass crashing if an object is in the wrong spot on a level? Rendering question , unreal-engine , lightmass-crash , UE5-0	0	435	September 13, 2022
Lightmass crash: "Static mesh element count did not match mesh instance count!" Rendering question , UE4 , Lighting , Lightmass , building-lighting , unreal-engine , lightmass-crash	3	2061	September 5, 2022
I get yellow lines all over the viewport when i make a a new project in ue5 Rendering question , Rendering , unreal-engine , lightmass-crash , UE5-0	12	1683	June 9, 2022
Lightmass crashed: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION writing address 0x00000000 Rendering question , crash , crashes , unreal-engine , lightmass-crash , crash-at-startup , gpu-lightmass	2	1507	March 30, 2022
GPU Lightmap crash on bake (4.26, 4.27) Rendering question , crash , Lighting , Lightmass , unreal-engine , lightmass-crash	0	919	August 29, 2021
Lighting build fails with EXCEPTION_ACCESS_VIOLATION if I move a static mesh too close to a structure? Rendering question , Lighting , Rendering , unreal-engine , lightmass-crash	0	670	August 2, 2021
Unreal Engine 4.26 keeps crashing after every interaction Getting Started & Setup question , crash , unreal-engine , lightmass-crash , gpu-lightmass	20	4791	June 19, 2021
Lightmap Density Viewmode crash Rendering question , Lightmass , unreal-engine , lightmass-crash	5	981	June 14, 2021
Error when im building lightning Rendering question , Lighting , building-lighting , unreal-engine , lightmass-crash , light-build	0	376	May 14, 2021
Lightmass Assertion failed: FaceCoordinate Rendering question , crash , unreal-engine , lightmass-crash	0	329	February 13, 2021
Cannot build lighting,lightmass crashed Rendering question , building-lighting , unreal-engine , swarm-agent , lightmass-crash , light-build	0	593	January 27, 2021
Why is Unreal Engine Crashing? Getting Started & Setup question , crash , crashes , unreal-engine , lightmass-crash , crash-at-startup	11	1568	December 3, 2020
Lighting build failing "Array Index out of Bounds" Rendering question , bug-report , Lighting , unreal-engine , Static-Mesh , lighting-problem , lightmass-crash	15	12384	October 26, 2020
I cannot build light. Stops after radiosity pass Community & Industry Discussion question , memory , gpu , unreal-engine , failure , swarm-agent , lightmass-crash	0	583	October 9, 2020
Lightmass crash Rendering question , crashes , unreal-engine , lightmass-crash	0	324	April 2, 2020
Editor Crashes on Lighting Build OS Catalina Rendering question , editor , UE4 , crash , Lighting , unreal-engine , lightmass-crash	2	401	February 12, 2020