Unreal Engine Issues
Unreal Engine Issues
VSM + Nanite Tessellation + Volumetric Fog Shadow leaking while the Directional lighting is rotating
UE - Rendering - Features - May 25, 2026Shadows become disabled for Datasmith imported lights on resync
TM - Interoperability - Aug 4, 2026Reported in SF [Link Removed] For Datasmith models containing lights, resynchronizing the model after any changes will cause any lights that had shadows enabled prior to the sync to have that setti ...
Landscape visualizers don't work on nanite landscape
UE - Graphics Tools - Terrain - Nov 24, 2025Landscape visualizers do not work on Nanite Landscapes. Also tested in //UE5/Main/, CL: 48569009 The licensee has provided a patch file with a potential fix. ...
Memory leak with -renderoffscreen and uncapped frame rate
UE - Rendering - RHI - Jun 22, 2026A customer reported that -renderoffscreen leaks when running with an uncapped frame rate ...
Visual Noise on Thin Translucent materials with a Directional Light
UE - Rendering - Features - May 30, 2023Regression in testing This occurs with hardware and software ray tracing, as well as moveable and static lights This occurs regardless of anti aliasing. This was tested with DX12 ...
The public header file ModelingToolsEditorModeToolkit.h exposes private module definition of ENABLE_STYLUS_SUPPORT
UE - Graphics Tools - Modeling Tools - Jan 15, 2026Local Exposure can cause large variations in PreExposure under certain conditions
UE - Rendering - Features - Sep 16, 2025PreExposure is influenced by LocalExposure in PostProcessEyeAdaptation.cpp:1265. It appears when the scene is particularly dark and using manual exposure, the LastAverageLocalExposure can read a lar ...
MATERIAL_SHADINGMODEL_TOON macro is not propagated to the substrate tool BSDF material on a DDC hit
UE - Rendering - Features - Shading Models - Jul 27, 2026On a DDC hit, the SubstrateMaterialBsdfFeatures variable restored into MaterialCompilationOutput is not copied into SubstrateTranslatorData.SubstrateMaterialBsdfFeatures, which is referenced by the ...
NPC - Initializing a System parameter to a Niagara Parameter Collection data interface parameter does not work
UE - Rendering - Architecture - Niagara - Jan 4, 2021Initializing a System parameter to a Niagara Parameter Collection data interface parameter does not work ...
Chaos Fields: LS_MasterField continuously creates components every frame and never cleans them up
UE - Runtime - Deformable - Mar 25, 2026While active and ticking, the built-in FS_MasterField actor instance continuously creates several new components every frame, which are never cleaned up until the actor is destroyed. This can happen ...