Unreal Engine Issues
Unreal Engine Issues
Incorrect restitution behavior for physical material set to 1 whereby momentum is gained during the simulation
UE - Simulation - Physics - Mar 24, 2015Setting a restitution of 1 for a ground material and a restitution of 1 for a ball that bounces on the ground should keep the ball bouncing at the same height consecutively. Over the course of time ...
Incorrect number of vertices displayed by ProfileGPU command in Cascade particles
UE - Niagara - Dec 9, 2021This issue was reported by the licensee, but it's possible that the number of vertices in the particles is higher than it really is. ...
"Out of video memory" crash when attempting to save many assets with source control enabled
UE - Graphics Features - Sep 25, 2020This will only repro when connected to source control ...
Unexpected behavior with Broken Constraint and Physics Blend Weight
OLD - Anim - Jan 13, 2017Looks like the position of the bone according to the animation is still being accounted for somehow, because the collision seems fine (when using pxvis collision). ...
Crash when a Deferred Decal (Translucent) base material has a Nanite Override (Masked Surface) Material and the mesh has Nanite + Ray Tracing enabled.
UE - Graphics Features - Ray Tracing - Aug 14, 2025A crash occurs when Nanite override material instance is used in a project with Ray tracing enabled where: 1 The Material assigned to the static mesh uses Deferred Decal / Translucent and the Nani ...
Collision channel settings are not recognized in Standalone
OLD - Anim - Oct 18, 2017Object instances that override the parent blueprint's collision settings are recognized in PIE but ignored in standalone or when running from the command line with -game NOTE: This appears to only ...
Environment Query System (EQS): EnvQuery runtime template object can be created with a non-unique name, corrupting the EnvQueryManager cache
UE - AI - Aug 5, 2025On file [Engine\Source\Runtime\AIModule\Private\EnvironmentQuery\EnvQueryManager.cpp:812], function UEnvQueryManager::CreateQueryInstance() uses StaticDuplicateObject() to create a new UEnvQuery* (d ...
Blueprint enum-to-string node returning inconsistent results across platforms
UE - Gameplay - Mar 5, 2020Converting a C++ enum to a string should be a consistent result, however when running in the editor it returns the display-name value instead of the index value. This prevents C++ UENUMs from being ...
A crash can occur when multiple Actors are spawned/destroyed simultaneously with each one loading an asset.
UE - Foundation - Core - Jan 6, 2017A crash can occur if multiple Actors are spawned/destroyed simultaneously, with each Actor loading an asset when it is spawned. This does not occur 100% of the time, but it does occur quite frequent ...
The Sorting Issue Between Height Fog and Transparent Objects
UE - Graphics Features - Aug 21, 2024When a LocalFogVolume is used with ExponentialHeightFog, it does not correctly fog translucent objects. ExponentialHeightFog and Volumetric Fog from a LocalFogVolume both correctly occlude transluc ...