Unreal Engine Issues
Unreal Engine Issues
Assets on paths with speed parameters are sped up in Path Tracer exports
TM - Tools - Jul 18, 2025Reported in SF [Link Removed] In Path Tracer renders, all paths with a speed component (vehicles, bicycles, custom) will render at an increased speed than specified in the exported render. This is ...
Conflict between sequencer transform track and Parent Constraint from the Animation Mode breaks temporary pivot translation on any actor
UE - Anim - Anim in Engine - Jul 15, 2025Note: This affects all versions from at least UE 5.3, including mainline latest. The "Animation" Editor Mode allows creating constraints for level actors. One of these, the "Parent" constraint, con ...
Property Editors fail to import text values for FKeys within array/set/map containers when the key is identified by some valid non-alphanumeric characters
UE - Gameplay - Input - Oct 28, 2024The FKey structure represents a user action input such as a keyboard key, a mouse button/wheel, or a gesture in VR. For the keyboard, it can represent any pressable key, such as letters, numbers, sy ...
The Remove-On-Break feature, set on Fracture Mode on Geometry Collections, stops shrinking and shows strange behaviors
UE - Simulation - Physics - Destruction - Oct 15, 2024The Remove-On-Break (ROB) feature, set on Fracture Mode on Geometry Collections (GC), was supposed to make the particle shrink until it vanishes. When the GC goes to sleep the shrinking stops and sh ...
The VertexInterpolator connected to a Normalize node, input into BaseColor results in black Mesh LOD Coloration
UE - Rendering Architecture - Materials - Nov 16, 2021It does not appear to matter to the repro steps what is input to the VertexInterpolator, it matters more that there is a Normalize between the VertexInterpolator and the base color input of the mate ...
Tick functions are skipped on the first frame in package build and standalone PIE
UE - Gameplay - May 19, 2025It's reported that all Tick functions are skipped on the first frame when running in packaged builds and standalone PIE. This is because both TickVisitedGFrameCounter and GFrameCounter are initializ ...
Starter Content's "P_Explosion" does not successfully convert to a Niagara System - incorrect loop, spawn, sprite size, and collision behaviors
UE - Niagara - Cascade - Mar 17, 2022Starter Content's "P_Explosion" does not successfully convert to a Niagara System - incorrect loop, spawn, sprite size, and collision behaviors Changes needed for / issues found with each emitter:A ...
GeometryCollectionActor SetSimulatePhysics false does not stop Physics Simulation
UE - Simulation - Physics - Nov 28, 2024If the GeometryCollectionActor (GCA) is simulating physics, calling SetSimulatePhysics(false) does not stop the simulation. If the simulation is paused, calling SetSimulatePhysics(true) does as expe ...
Some instances spawned by NeagaraDataInterfaceChaosDestruction breaking event will be set location to the world origin
UE - Niagara - Data Interface - Nov 29, 2024The following code can often be found in UNiagaraDataInterfaceChaosDestruction.const int32 ParticleID = ParticleIDParam.GetAndAdvance() - LastSpawnedPointID + 1; The LastSpawnedPointID is usual ...
Blueprints break when implementing a duplicated BP interface along with the original
UE - Framework - Blueprint - Mar 1, 2024When duplicating a blueprint interface, the GraphGuids of the original BP interface's function graphs are unchanged: function graphs across the two BP interfaces now have the same GraphGuid. This is ...