Unreal Engine Issues
Unreal Engine Issues
FRayTracingGeometryManager::Tick() called twice during a single frame
UE - Rendering - Features - Ray Tracing - Mar 5, 2025UDN licensee Prophecy Games has encountered an issue in which the RaytracingGeometry::Tick() function is called twice during a single frame. This causes an assert to trigger, which blocks them from ...
Crash playing in viewport with a character that has a Wheel Class
UE - Simulation - Physics - Aug 27, 2016Crash occurs when playing in editor with a character that has a Simple Wheeled Vehicle Movement Component, with a Wheel Class assigned to it. This crash seems to only occur if Don't Create Shape is ...
Deleting a Sync Marker created by an Animation modifier deletes all Sync Marks made by the Animation Modifier
UE - Runtime - Animation - Jan 14, 2022Using the delete key or context menu to delete a single sync marker created by an Animation Modifier deletes all sync markers created by the Animation Modifier. If all the markers are deleted, and ...
Code delegates duplicate function calls when owning actor is duplicated in the editor
UE - Foundation - Core - Jan 15, 2016If an actor that contains a delegate bound in code is duplicated after being placed in the level, the delegate for the duplicate will also trigger the delegate for the original as well. ...
When an active Niagara Component is moved and reset+reactivated in the same frame, "Interpolated Spawning" causes "Spawn Burst Instantaneous" to spawn particles in the previous frame's outdated location
UE - Rendering - Architecture - Niagara - Mar 6, 2024Consider a Niagara System with an Emitter in "Global Space" that has "Interpolated Spawning" active and a "Spawn Burst Instantaneous" module with a "Spawn Time" of 0.0 (for example, the built-in Con ...
RootMotion Malfunctioning When Played in Lower Framerates
UE - Gameplay - Player Movement - May 2, 2016Root Motion Animations are not functioning correctly during lower frame rates. For example, a character moving forward 2 meters at regular frame rate will move 10 meters at a lower frame rate. Regr ...
VisibleAnywhere MovieSceneObjectBindingID property is editable
zComponent - Archive - Apr 19, 2024In general, UPROPERTY(VisibleAnywhere) makes a property ineditable. But, if the type of a property is FMovieSceneObjectBindingID, VIsibleAnyhere no longer prohibits it from editing. [Image Removed] ...
Calling UHierarchicalInstancedStaticMeshComponent::AddInstance multiple times causes crash
UE - World Creation - Worldbuilding Tools - Foliage - Jan 16, 2019Calling UHierarchicalInstancedStaticMeshComponent::AddInstance multiple times causes multiple BuildTrees to be created and run asynchronously at the same time. Tested in 4.21(CL - 4613538) How t ...
Blueprint Struct associations in Blueprint hierarchy causes command line cooker to crash
UE - Gameplay - Blueprint - Oct 13, 2016If a user creates a specific Blueprint hierarchy with a Blueprint struct, it can cause a issue when the Blueprint struct is being cooked. User description of Blueprint(s) and Blueprint Struct relat ...
Closing the GPU Visualizer window on Linux causes the editor to crash
UE - Platform - Linux - Oct 21, 2015After opening the GPU Visualizer window, pressing the "X" to close the window causes the editor to crash. ...