Unreal Engine Issues
Unreal Engine Issues
UWorldPartitionSubsystem::IsStreamingCompleted returning the wrong query result when all cells and actors in location are in DataLayers
UE - World Creation - Worldbuilding Tools - World Partition - Jul 24, 2025Context: Data Layers is a system within World Partition used to organize Actors both in the Editor and at runtime. It allows for the user to dynamically load and unload layers in the Editor to help ...
GPU Particle Collision causes shaking when set to bounce with low resilience.
UE - Niagara - Jul 27, 2016A particle emitter with GPU sprites on certain settings will shake violently as they collide with the ground. This requires there to be a strong Const Acceleration module and Collision with low resi ...
Get Constraint Force node always returns a magnitude zero vector
UE - Simulation - Physics - Solver - May 4, 2022Get Constraint Force node always returns a magnitude zero vector. Repro Rate: 3/3 Tested this in //UE4/Release-4.27 @ CL#18319896 and was able to get the constraint force, it is a regression. ...
In a listen server, when a client moves, anim notifies don't get fired for the server/host.
UE - Anim - Gameplay - Nov 14, 2022Reproduced 3/3 times. Was not able to reproduce in //UE5/Release-5.0 - CL 20979098 Binary. Confirmed Regression. ...
When packaging a cpp project created with the InstalledBuild engine, the build does not complete.
UE - Foundation - Cpp Tools - Automation Tool - Mar 27, 2023Material ParticleRandom node doesn't have proper value returned in specific case
UE - Niagara - Jul 14, 2024CreateD3D12Texture causes the Low Level Memory system to register two allocations for the same pointer on the same track channel
UE - Rendering Architecture - RHI - Oct 31, 2024CreateD3D12Texture causes two OnLowLevelAllocs in LLM to be called with the same pointer and the same channel, leading to a warning. LLM WARNING: Replacing allocation in tracking map. Alloc/Free Mi ...
Editor crashes when using PCG SpawnActor with a DataLayer inside a Level Instance
UE - World Creation - Procedural Tools - Jun 4, 2025A PCG actor is assigned to a DataLayer and placed inside a Level Instance. Then that Level Instance is placed into a World Partition map. When the SpawnActor node in the PCG graph is set to MergePCG ...
LIVE: Code projects using TextureRenderTarget2D will not build because UTextureRenderTarget is undefined in TextureRenderTarget2D
UE - Foundation - Core - Nov 5, 2014If a TextureRenderTarget2D is used in a code class, the build of the project will fail with an error stating that the UTextureRenderTarget base class is undefined. The line #include "Engine/TextureR ...
Cascade pooled emitters are not reclaimed on disabled LODs
UE - Niagara - Aug 30, 2019Pooled memory will not be reclaimed from emitters with disabled LODs if Disabled LODs Keep Emitter Alive is checked. ...