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 ...
Casting to a child with a self reference can cause a crash
UE - Gameplay - Blueprint - Aug 13, 2015Casting to the child of a blueprint using the self reference (as the parent) throws a warning. Then placing a self reference anywhere in the event graph of the child by it's self will cause a crash ...
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 ...
VR Preview crashes when the number of players is greater than one
UE - Platform - XR - Aug 18, 2015If the user has the number of players set to more than one, the VR preview will crash. ...
Crash when Opening the Class Defaults or Class Settings Tab within an Actor Blueprint
UE - Gameplay - Blueprint - May 19, 2015A crash occurs when attempting to open the 'Class Defaults' or 'Class Settings' tab of an Actor Blueprint. If the 'Details' tab is already open and you close it and attempt to reopen the options, th ...
Users are crashing on launch. D3D11 errors
UE - Graphics Features - Jun 23, 2015Users are experiencing this crash on launch. They all appear to have identical machines for the most part. They've tried different GPU's though. See the additional info URL [Link Removed] [Link ...