Unreal Engine Issues
Unreal Engine Issues
Lumen scene view - spot light cut off
UE - Rendering Architecture - Dec 1, 2023This looks to be an issue with shadows in Lumen Direct Lighting, and might be coming from the "Batched lights" pass. ...
Go to end and Stop on level sequences does not work with keep state animations and anim bps
UE - Anim - Anim in Engine - Jan 16, 2024When a skeletal animation section is set to Keep State, and the mesh uses an anim BP and slots to play back the animation, calling Go to End and Stop on the sequence will not pause the animations. ...
GPU event descriptions are not properly formatted in Insight
UE - Foundation - Insights - Jun 24, 2025Context Unreal Insights displays Timing Insights that can include GPU timing information. Rendering code such as FDeferredShadingSceneRenderer::RenderPrePass() generate such events.Problem Certain f ...
FD3D12BindlessResourceManager::GrowCPUHeap will cause GPU heap activation whether it's needed or not
UE - Rendering Architecture - RHI - Sep 11, 2025The ctor of FD3D12BindlessResourceManager implies that GPU heap activation is intended to occur lazily with ERHIBindlessConfiguration::RayTracingShaders, however any call to FD3D12BindlessResourceMa ...
[Waveform Editor] - Waveform Editor has noticeable latency with larger files [investigate/profile only for now]
UE - Audio - WaveformEditor Plugin - Sep 19, 2022I've noticed as I've been working with the Wave Form Editor, that it works fairly well for smaller files, but on longer assets there can be some pretty noticeable latency when adding and adjusting t ...
Navmesh rebuild always occurs on Startup map immediately after starting editor
UE - AI - Navigation - Nov 22, 2022Whenever launching the UE5 Editor, it rebuilds the navmesh on the first map it opens. Reopening the same map again will not cause the navmesh to be rebuilt. It seems that the first time the map is o ...
Double clicking on Interface Function in Blueprint Graph does not take you to the function implementation.
UE - Editor - Jan 11, 2024When double-clicking on an interface function call within a blueprint, the expected behaviour is that it will take you to the implementation of this function. However, it currently does nothing. ...
Creating MaterialInstanceDynamic for a moving/crumbled geometry collection component, the rendering position is reset to the initial location
UE - Simulation - Physics - Destruction - Apr 23, 2024Creating a MID makes the render state dirty and the engine will recreate a new scene proxy without the current attitude. This results in rendering the object in incorrect location. Here is a tempor ...
Using Clip() in a material may cause the outline to be displayed incorrectly on the Editor.
UE - Graphics Features - May 3, 2024This appears to be from an interaction between the Depth Fade Expression, clip() in a Custom Expression, WPO being enabled, and the fact that the pass that draws objects for the editor outline runs ...
SetActorLabel() is slow on Landscapes
UE - Graphics Tools - Terrain - Landscape - Jan 7, 2025I've noticed calling SetActorLabel() on a Landscape will call PostEditPropertyChanged() which causes the Landscape Components to regenerate all collisions. As per the repro, this can take a long tim ...