Unreal Engine Issues
Unreal Engine Issues
Copying a grouped MaterialInstanceParameterDetail property that has spaces on it's name does not enclose it in double quotes, and later pasting won't work as expected
UE - Rendering - Architecture - Materials - Aug 24, 2025Copying a grouped MaterialInstanceParameterDetail property that has spaces on it's name does not enclose it in double quotes, and later pasting won't work as expected. The licensee noticed this in a ...
Geometry Collections built with "Use Root Proxies" rendering/transform positions ignore the original root node rotation and can lead to unexpected behaviors
UE - Simulation - Visual - Nov 17, 2025Geometry Collections (GC) built with "Use Root Proxies" rendering/transform positions ignore the original root node rotation and can lead to unexpected behaviors. If the root node of the GC was rot ...
With Ray Tracing Enabled And The RenderDoc Plugin Enabled Shadows Don't Render Correctly On Reflective Materials
UE - Graphics Features - Lumen - Jan 23, 2020When the RenderDoc plugin is installed with raytracing enabled shadows don't render correctly. Found in 4.24.1 CL#10757647 Reproduced in 4.23.1 CL#9631420, 4.25 Main CL#11087956 ...
The menu and cursor are removed from the Client window when clicking Play in the Server menu in Multiplayer Shootout
Docs - Samples - Jun 29, 2015The menu and cursor are removed from the Client window when clicking Play in the Server menu in Multiplayer Shootout. Reproduced using the 4.8.1 download of Multiplayer Shootout. Did not occur in 4 ...
Crash when exporting static mesh actor to FBX (Array index out of bounds)
UE - Editor - Content Pipeline - FBX - Apr 25, 2025I set the Forced LOD Model on the mesh component > 1, then tried to export, this is what causes the crash. Here is my suggested fix, we just don't use Git or I'd do a PR: In the else() branch of FF ...
Using Blend Physics Weight causes skeletal mesh to spin at high speed
OLD - Anim - Mar 5, 2015When Phyics Blend in the PHAT editor is set between 0 and 1, the user character will spin wildly. User has image of this affecting character in game whereas I was only able to replicate it in the PH ...
Switching CanEverAffectNavigation on a Dynamic Obstacle Leaves Original Area Behind
UE - AI - Sep 15, 2016When setting Can Ever Affect Navigation to false, moving it, and then setting it back to true, the originally affected area remains, and it also creates a new affected area. This occurs each time y ...
Physics Constraint Component loss of accuracy
UE - Simulation - Core - Mar 6, 2025Physics Constraint Component has lost accuracy between Unreal versions 5.2 and 5.4 (and up). When measuring the exact distance between rigid bodies constrained by a Physics Constraint Component, the ...
Issue with r.SkyAtmosphere.TransmittanceLUT.UseSmallFormat
UE - Rendering - Graphics Features - Mar 30, 2026When "r.SkyAtmosphere.TransmittanceLUT.UseSmallFormat=1", some values for the Sky Atmosphere at some directional light angles can lead to the sun disk being cut off, and taking on a chord shape. A ...
UDestructibleComponent::ApplyDamage doesn't affect root chunk if the mesh doesn't fracture.
UE - Simulation - Physics - Destruction - May 6, 2016ApplyDamage calls through to applyDamage on the apex actor, which takes the impulse and applies it to any fractured chunks. If however not enough damage is done to the component to fracture it, no i ...