Unreal Engine Issues
Unreal Engine Issues
Crash when adding Rectangle Lights to a game with multiple players while Raytracing is enabled
UE - Graphics Features - Nov 9, 2021A user reported this issue to us through Salesforce. They initially said it crashed with both Spot Lights and Rectangle Lights, but I was only able to repro with Rectangle lights. Additionally, I di ...
Crash occurs when RayTracing.ExcludeDecals is enabled
UE - Graphics Features - Lumen - Sep 16, 2020The cause of the crash is out-of-range access to the array. ExcludeDecals eliminates the mesh instance to which the decal material is assigned, but it seems that the MeshCommand has been registered ...
The Radial Blur Shader Doesn't Look Correct With Raytracing Translucency Enabled
UE - Graphics Features - Lumen - Jan 21, 2020The Radial Blur shader doesn't look correct with ray tracing translucency enabled. Found in 4.24.1 CL#10757647 Reproduced in 4.25 Main CL#11050671 ...
If you use a transparent Material for one of the multiple materials, it will always show up in the raytraced reflection.
UE - Graphics Features - Lumen - Sep 15, 2021Raytraced translucency makes ExpHeightFog black
UE - Graphics Features - Mar 17, 2023Does not occur in path tracing nor rasterized translucency. ...
Spline mesh can not cast shadow when raytracing enabled.
UE - Graphics Features - Lumen - May 19, 2021Nanite Skeletal Mesh uses incorrect LOD for raytracing
UE - Graphics Features - Nanite - Jan 13, 2025LOD0 for some Nanite Skeletal meshes is used for ray tracing scenes on some platforms because some FSkinnedSceneProxy are incorrectly considered "always visible" ...
Crash using D3D raytracing with Support Ray Tracing unchecked static mesh
UE - Graphics Features - Nov 24, 2021Static mesh that does not have Support Ray Tracing flag does not have a GeometryRHI object. So it causes a crash in FD3D12RayTracingScene. Excluding instances that do not have a GerometyRHI in FDef ...
Compilation error when using Particle SubUV in Niagara Mesh Particles with Raytracing enabled.
UE - Niagara - Oct 12, 2021The licensee has shared the following workaround for modifying NiagaraMeshVertexFactory.ush. struct FVertexFactoryInterpolantsVSToPS { TANGENTTOWORLD_INTERPOLATOR_BLOCK #if USE_PARTICLE_SUBU ...
Raytracing Material Border Artefacts
UE - Rendering Architecture - Materials - Jan 20, 2023Download the licensee repro from here - [Link Removed] The issue should be immediately visible in editor, but if not, shrink the main viewport and it should become more prominent as you zoom into t ...