Unreal Engine Issues
Unreal Engine Issues
Crash enabling Stochastic Rect Light with Ray Tracing
UE - Graphics Features - Lumen - Oct 13, 2020Enabling Stochastic Rect Lights with Ray Tracing causes the project to crash. Reported and tested in version 4.26.0(CL 14419252). Tested and not found in version 4.25.3(CL 13942748). ...
Landscape smooth and flatten tools deform the terrain incorrectly
UE - Graphics Tools - Terrain - Landscape - May 25, 2022The Landscape smooth and flatten tools can deform the landscape incorrectly causing chunks of the landscape to be removed (see attached image). ...
HighResScreenshot crashes in windows packaged exe
UE - Rendering - Architecture - Mar 22, 2023FHighResScreenShotConfig::Init() sets the materials only in the Editor, due to a #if WITH_EDITOR block. However, the FViewport class exposes the TakeHighResScreenShot to non-editor builds as well, l ...
Separate translucency rendering and material BumpOffset UV issues
UE - Rendering - Architecture - Oct 20, 2023It appears as if the primary screenpercentage is being sent as the screen size to separate translucency materials, even though separate translucency has its own screenpercentage (r.SeparateTransluce ...
Case Child Actor Component validation error when set as editor-only
UE - Framework - Components - Jun 4, 2024When a blueprint actor with a child actor component is placed in a level, and the child actor component is set as editor-only, the output log will show a validation error when the actor is moved and ...
Moveable Spotlight Shadows doesn't render in right eye
UE - Platform - XR - Dec 4, 2024All objects imported through Interchange use smooth shading.
TM - Interoperability - Dec 7, 2023[Image Removed] It imports correctly in UE with interchange import:[Image Removed] ...
Call In Editor functions not working in blueprints
UE - Editor - Dec 19, 2025Context When selecting a component on an actor, any CallInEditor functions on the component's class appear as buttons in the details panel. Problem The CallInEditor functions don't execute in Blu ...
Bug - Vertex Interpolator exposing parameters to instance even if its not connected
UE - Rendering - Architecture - Materials - Feb 17, 2026Parameters attached to the input of a Vertex Interpolator Material Expression are visible in the Material Instance, even if the output of the Vertex Interpolator Material Expression is not connected ...
Building lighting fails on Linux without Internet connection
UE - Platform - Linux - Jul 6, 2015Attempting to build lighting will stay at 0% and eventually fail if there is not internet connection for the computer. ...