Unreal Engine Issues
Unreal Engine Issues
PCG sampling of RVT does only works when sampling the first texture layer
UE - Graphics Tools - PCG - Components - Dec 11, 2025The logic for selecting a page table texture in FVirtualTexturePageTable::Initialize() uses the indexing for texture layers (index 0-7) to fetch from the page table textures (index 0-1). All RVT for ...
Crash when clicking "Reset to Default" button on the Details Panel for the MaterialAttributeLayers material node.
UE - Rendering - Architecture - Materials - Jul 15, 2025This crash repros from at least UE 5.3 and up to latest. The following assert is hit: Assertion failed: (Index >= 0) & (Index < ArrayNum) [Link Removed] [Line: 1067] Array index out of bounds: 0 in ...
Changing number of existing UHierarchicalInstancedStaticMeshComponent in Blueprint causes crash.
UE - Graphics Features - Oct 14, 2016If using a UHierarchicalInstancedStaticMeshComponent in a C++ class and adding instances via the OnConstruction( ) function, editor can crash. ...
Unable to input Chinese characters (Microsoft Pinyin) after inputting 34 half-width characters
UE - AI Workflows - UI Systems - Slate - May 2, 2024If we enter Chinese characters using Microsoft Pinyin after entering 34 or more half-width characters in a text field, they are not reflected in the box. If less than 34 characters are entered, Chin ...
Incorrect mesh deformation when Max World Position Offset Displacement used
UE - Rendering - Features - Nanite - Feb 12, 2025When Vertex Animated Texture is used to animate a mesh with World Position Offset, often the Max World Position Offset Displacement Material setting must be increased or the Bounds Scale increased, ...
GPU Validation texture barrier errors for SkyAtmosphere component
UE - Rendering - RHI - Jul 20, 2026A licensee reported that two SkyAtmosphere texture resources do not have proper memory transitions added by the RDG. This happens because in VolumetricCloud.usf, these textures are referenced via Vi ...
[Stall] AudioMixerSourceManager::FlushCommandQueue when opening editor for asset
UE - Audio - Apr 7, 2022Live issue. Stall occurring for some users in the 5.0 Release. Currently hit 577 times by 500 users as of 2022-04-29 No specific project occurring on ...
Anisotropy renders differently in each eye in VR
UE - Platform - XR - Jan 10, 2023Regression: Tested in Release-5.0, this issue occurs so it is not a regression. This issue was first reported using the Automotive Materials assets, as the Anisotropy material on MI_Metal_Brushed w ...
r.AllowOcclussionQueries causing "huge RenderQuery Result" wait time in VR
UE - Graphics Features - Dec 3, 2019Running r.AllowOcclusionQueries 0 command seems to set bWait = true, causing large wait times Tested: 4.22.3 CL#7053642 , 4.24P4 CL#10387632 , 4.25 CL#10479005 Link to the users video, which ...
Cannot specify custom window positions in "windowed mode" for packaged games
Tools - Nov 30, 2017There is an issue where you cannot specify a specific location for a windowed packaged game when using a command line to open the project, the project will move to that position for a brief moment b ...