Unreal Engine Issues
Unreal Engine Issues
Implied Decal Blend Modes don't properly account for Material Attributes usage
UE - Rendering - Architecture - Sep 28, 2021I've attached a project with the necessary materials that demonstrate this issue. I would expect that just because a Set Material Attributes node is inside a material graph it wouldn't affect the de ...
WPO is incorrectly generated on materials using Material Attributes as input to Landscape Layer Blend node
UE - Rendering - Architecture - Materials - Jan 31, 2024This comes from this UDN : [Link Removed] It occurs with this setup : [Image Removed] , where Set Material Attributes expressions act as inputs to the Landscape Layer Blend material expression. ...
Crash generating grass for landscape with XY offset map
UE - LD & Modeling - Terrain - Landscape - May 8, 2015Landscape grass map generation crashes if the landscape component in question uses an XY offset map. --------- Fatal error: [Link Removed] [Line: 646] Rendering thread exception: Fatal error: [Lin ...
When a BPActor containing HISMs is multiplied with a scale, LOD display control doesn't work correctly
UE - Rendering - Architecture - Nov 29, 2023Workaround 1: 1. Change HierarchicalInstancedStaticMesh.cpp in either of the following ways:void{{ FHierarchicalStaticMeshSceneProxy::GetDynamicMeshElements(const TArray<const FSceneView*>& Views, c ...
Physics not reacting correctly with physical material if velocity is not high enough
UE - Simulation - Physics - Feb 3, 2015There are issues with the way Physics is being handled with physical materials. Having a physical material setup with a restitution of 1 and a high max depenetration value will result in no bounce. ...
Spring Arm rotation only prints Yaw after 4.17 conversion
UE - Gameplay - Aug 11, 2017Spring Arm rotation only prints Yaw after 4.17 conversion. In 4.16 it would print the Yaw, Pitch, and Rotation as expected. The spring arm by itself prints the rotation correctly but once a camera ...
BoxOverlapActors fails to catch an Overlaped actor with a particular scale, from a particular position
UE - Simulation - Core - Sep 30, 2025BoxOverlapActors fails to overlap a scaled Floor actor with a particular scale, from a particular position and extent. The setup is really specific and described in Steps to Reproduce. The required ...
Crash with Ensure when resizing layout
UE - Editor - Workflow Systems - Jun 1, 2023This is a regression as the issue does not occur in //UE5/Release-5.1.1 - CL 23901901 ...
Physics Constraint Actor: When plasticity is enabled, Drive Position Target is reset to zero on constraint initialization
UE - Simulation - Core - Mar 5, 2026When a Chaos joint constraint is first created, having linear/angular plasticity enabled will unexpectedly force its linear/angular drive position target to zero on initialization, disregarding the ...
DOF - TAA pass ghosting when using r.DOF.TAA.CoCBilateralFilterStrength
UE - Rendering - Graphics Features - Aug 7, 2025In Unreal 5.6, there's a new CVar: r.DOF.TAA.CoCBilateralFilterStrength, which should help with ghosting artifacts introduced by TAA in DOF passes. However, it doesn't work as expected since many gh ...