Unreal Engine Issues
Unreal Engine Issues
Montage Root Motion does not work from sub anim instances
UE - Anim - Gameplay - Oct 25, 2019Root motion from sub instances is not used when the parent instance is marked as 'Root Motion from Montages Only'. Proposed fix is to modify USkeletalMeshComponent::IsPlayingNetworkedRootMotionMo ...
ISM Component in an instanced BP does not take into account changes to NumCustomDataFloats from the BP class
UE - Graphics Features - Sep 16, 2022PerInstanceSMCustomData is bulk serialized and doesn't get changed on the BP instance when changing NumCustomDataFloats, possibly causing out of bounds array access leading to a crash. Possible sol ...
FMaterialResource::IsDualBlendingEnabled bug
UE - Rendering Architecture - Materials - Jul 24, 2023The user has a proposed fix for this in the case. FMaterialResource::IsDualBlendingEnabled needs the following modification that includes MaterialInstance check: bool bMaterialRequestsDualSourceBle ...
Auto Exposure Compensation Curve issue when switching from Histogram to Manual
UE - Rendering Architecture - Feb 21, 2024When switching the Camera's Exposure Metering Mode from Histogram to Manual, there is a single-frame flash. The Licensee has a proposed code change that would fix this issue. Also found in 5.4, CL 3 ...
Performance hitch from RemoveGeometryCache flushing the render thread
UE - Editor - Content Pipeline - Alembic - Jun 12, 2025FGeometryCacheStreamingManager::RemoveGeometryCache calls FlushRenderingCommands which shows up as a hitch when profiling. [Link Removed] Ideally the flush added in CL#23782411 to fix a rare deadl ...
Ensure starting PIE after editing character blueprint of a code based side scrollers
UE - Gameplay - Apr 6, 2016After editing character blueprint of a code based side scroller project, starting PIE will show the camera detached from the character and exiting PIE causes the project to crash. NOTE: This appear ...
Crash Occurs When Renaming Folder in Landscape Mountains Project
Tools - Jun 23, 2016Changing the name of a newly-created folder that contains a few copies of the same map causes a crash in the Landscape Mountains project. This crash did not occur in a clean First Person project wh ...
FFieldPath resolution doesn't handle redirection
UE - CoreTech - Feb 16, 2022A licensee has found that redirectors don't apply to FFieldPath. We should integrate it with the following changes:It needs better error handling (looks like it could infinitely recurse),The change ...
Adding HISM instance on a Dedicated Server causes a crash
Tools - Nov 14, 2018Adding an instance of an HISM on a dedicated server causes an assert. Regression?: No This occurred in 4.20 ...
Using "RecompileShaders All" while PIE crashes editor with an assert.
UE - Graphics Features - Nov 10, 2016I ran the command with no actual changes to shaders. Recompileshaders global and changed did not crash the editor. ...