Unreal Engine Issues
Unreal Engine Issues
Water body actor casts static shadow
UE - Graphics Tools - Terrain - Water - Jan 14, 2025WaterBody Actors will cast static shadows in built lighting even if their Cast Shadow options are disabled. ...
Incorrect motion baking from Anim Sequence to Modular Control Rig
UE - Anim - Rigging - Feb 26, 2025When using a modular control rig and baking to a control rig directly from an anim sequence, some parts do not bake correctly. ...
Distance Field AO from Moveable Skylight (non-Lumen) invalidates AO incorrectly with a screenspace offset to the right of moving objects
UE - Graphics Features - Mar 25, 2025When Global Illumination is set to “None” in the project settings the ambient occlusion does not correctly render shadows for moving objects. This has been observed in versions 5.4 and above. ...
Skylighting on distant objects causes severe flickering with Lumen
UE - Graphics Features - Lumen - Mar 31, 2025Lighting on distant meshes flickers when using Lumen and Skylights. Turning Lumen off and lighting from the skylight is stable. Turning off Lumen screen traces also lowers the amount of flickering ...
Changes to Instanced Properties default value on BP not propagated to placed actors in the opened level
UE - Foundation - May 15, 2025In UE versions 5.4 and onwards (as of CL 42589677 in Main), when an Instanced UObject property is defined in an Actor Blueprint, modifying the default value in the Blueprint does not propagate the c ...
Imposter renders incorrectly in PCG volume after updating to 5.4
UE - World Creation - Procedural Tools - PCG Component - Jun 27, 2024The last level of impostors in PCG volumes render incorrectly after updating from 5.3 to 5.4. ...
Server only network emulation settings applied to client on travel
UE - Networking - Sep 4, 2024It looks like the "Server Only" emulation settings are being applied to the client after a travel. When doing a server travel with the TRAVEL_Relative travel type, the NextURL created in AGameModeBa ...
Misalignment between meshes used in landscape spline segments
UE - Graphics Tools - Terrain - Dec 17, 2024When using a landscape spline with multiple segments, there can be misalignment between spline segments when the tangent length of segments are too short, causing visual seams between meshes that sh ...
Lumen ignores Landscape Holes (Landscape Visibility) when Hardware Ray Tracing is enabled and Ray Lighting Mode is set to Surface Cache
UE - Graphics Features - Ray Tracing - Jan 31, 2025Context Lumen is the default global illumination and reflections system. Lumen renders diffuse interreflection with infinite bounces and indirect specular reflections in large, detailed environments ...
HZB Occlusion causes large stalls on the render thread
UE - Rendering Architecture - RHI - Oct 7, 2025HZB Occlusion causes large stalls (greater than 5ms seen) on the render thread due to an RHI flush. This is caused by the following code in FDynamicRHI::RHIMapStagingSurface_RenderThread which force ...