Unreal Engine Issues
Unreal Engine Issues
World position offset (WPO) and nanite enabled causes shadow of complex static mesh actor to be deformed at a specific distance
UE - Graphics Features - Nanite - Dec 19, 2024Context / Problem: Complex static mesh actors with nanite enabled and Evaluate World Position Offset (WPO) enabled works together except for a specific distance where the shadow is deformed and sort ...
Masked TwoSided material causing lumen direct lighting to leak through walls
UE - Graphics Features - Lumen - Apr 23, 2024It appears that LumenScene's Hardware Ray Tracing is causing light leaking into a sealed room (which should be perfectly black). This bug does not appear to happen on AMD GPUs. ...
High Virtual Texture Sample/Lookup Cost when using a Virtual Texture in a Material Layer Blend
UE - Rendering Architecture - Materials - Mar 14, 2025Some Material Attribute blends in Material Layer Blends can cause Virtual Texture samples to be duplicated in HLSL. This can be avoided by sampling the Virtual Texture in the Parent Material, and pa ...
Packed level actors and Level instances are sometimes not included in HLOD build on a World Partition Level
UE - World Creation - Worldbuilding Tools - HLOD - Mar 14, 2025Context World Partition - Hierarchical Level of Detail (HLOD) system uses custom HLOD Layers to organize large amounts of Static Mesh Actors and generate a single proxy mesh and Material. Problem T ...
Water tiles flicker in and out of visibility with instanced stereo enabled.
UE - Graphics Features - Jun 16, 2025Water tiles flicker in and out of visibility when playing in VR with instanced stereo enabled. Requires instanced stereo rendering to be enabled (does not require forward shading to be enabled) Must ...
Swapping the Child Actor Class of a ChildActorComponent back to a previously selected BP leads to an Editor crash from illegal Renaming
UE - Framework - Components - Sep 11, 2024A fatal error occurs if we change a Child Actor Class from one BP (ex. "BP_A") to a different BP ( ex. "BP_B") and later change it back to the first BP (ex. "BP_A") without compiling the BP between ...
Actor Dropped at Wrong Location During PIE
UE - Editor - Applied Usability - Apr 3, 2025When attempting to drag and drop an actor from the Content Browser into the level viewport during PIE, the actor is not placed at the mouse cursor location if the Player Controller is attached. Inst ...
Chaos Vehicle does not make them CCD
UE - Simulation - Physics - Jan 10, 2024AWheeledVehiclePawn class tries to use CCD in the constructor, but Mesh->BodyInstance.bUseCCD = true this code does not work to activate CCD because Physics Assets could not be available at this ...
Default Data Wire Thickness in the Editor Preferences only affects Single Value data wires. Containers (Array, Set, Map) line thickness are wrongly tied to Default Execution Wire Thickness.
UE - Gameplay - Blueprint Editor - Aug 19, 2024Changing the "Editor Preferences > Content Editors > Graph Editors > Tracing > Default Data Wire Thickness" value in the "Editor Preferences" only affects single value data wires. Containers (Array, ...
MemReport does not seem to respect mesh streaming
UE - Rendering Architecture - Aug 6, 2024The function "FStaticMeshLODResources::GetResourceSizeEx(...)" does not take into account that the buffers might be emptied, due to Mesh Streaming. This causes "obj list" to report sizes larger than ...