Unreal Engine Issues
Unreal Engine Issues
Incorrect relative location on client under certain attachment conditions
UE - Networking - Nov 30, 2021An attached actor's relative location isn't correct on the client when the actor has its position changed to that of the parent actor before attaching with the "Keep World" location rule. On the cli ...
Curve Atlas Row Parameter uses derivative ops when Texture Sample connected to curveTime input
UE - Rendering - Architecture - Materials - May 1, 2026When a Curve Atlas Row Parameter node is used with a Texture Sampler connected to the curve time input, the sample type uses derivative ops. This has negative performance implications for Nanite co ...
Foliage's Landscape Layers are not reflected when Landscape is rotated
UE - LD & Modeling - Terrain - Landscape - Feb 19, 2020This problem seems to occur because Rotation is not taken into account when calculating Weight. I have confirmed that it can be solved by calculating the rotation as follows.float ULandscapeCompone ...
New Viewport Resolution setting increases every time a new PIE window is launched
UE - Editor - UI Systems - Slate - Sep 2, 2022When closing a PIE viewport, we write the size back to the New Viewport Resolution setting in case the window was resized during play. However, we do not account for the window border, and write bac ...
Roughness rendering differently on Macs
UE - Graphics Features - Oct 4, 2016The roughness value for Macs renders differently (less rough or glossy) compared to Windows. It also seems to render as expected within the Material Editor preview window, but when applied to an obj ...
FBX files with multiple Meshes with only 1 unwrap per mesh will have invalid Light Map coordinates assigned
Tools - Jun 8, 2014An FBX with Multiple Meshes and only one unwrap per mesh (no 2nd UV channel) will import the first mesh in the file correctly but will produce invalid lightmass settings on each additional mesh impo ...
Unable to increment TMap value if Key is zero
UE - Gameplay - Feb 24, 2017Unable to increment TMap value if Key is zero. Changing the TMap Key to 1 on Add will allow the Value of "Key 0" to be incremented. User Description: It seems as if the 'Find' node for the newly ...
SplineMeshComponent's collision will start to distort the longer the Spline becomes
UE - Gameplay - Nov 30, 2016SplineMeshComponent's collision will start to distort the longer the Spline becomes This is a regession. It was working in 4.13.2-3172292 User Description: When drawing out a long spline mesh ( r ...
GetStaticRayTracingGeometries doesn't check if mesh has ray tracing disabled
UE - Rendering - Graphics Features - Ray Tracing - Nov 12, 2025An ensure is hit for static raytracing geometry because skeletal mesh assets that had ray tracing disabled were not handled in: FSkeletalMeshSceneProxy::GetStaticRayTracingGeometries The concurrent ...
Crash when applying a LandscapeVisibilityMask material to a Landscape's material slot
UE - LD & Modeling - Terrain - Landscape - Apr 28, 2017Crash that occurs when applying a masked material (with LandscapeLayerBlend and LandscapeVisibilityMask) to a Landscape's material slot. This is a regression: broken in 4.16.0 CL 3405315 worked in ...