Unreal Engine Issues
Unreal Engine Issues
Undo and ConstructionScript break the AttachChildren array
UE - Gameplay - Components - Nov 14, 2019Undo fills AttachChildren array with null by the undo serializer. After that, a construction script tries to remove child components from parent component's AttachChildren but it can't find its poi ...
UMG Crashes When Using "Create Dynamic Material Instance" With An Optional Name Twice
UE - Editor - UI Systems - Feb 17, 2020When using an Optional Name parameter in Create Dynamic Material Instance while using the same Optional Name twice in UMG the engine crashes. I have tested this in a actor blueprint that applies th ...
Networking Engine Tests fail for NotifyParamCorrect on Client
UE - Networking - Oct 2, 2019The following errors occur when running the networking engine tests with 2 clients and a dedicated server. LogFunctionalTest: Error: Assertion failed: 'EngineTestNetActorComponent bRepArrayAddNotif ...
Ocean does not completely fill water zone in certain circumstances
UE - Graphics Tools - Terrain - Water - Jan 26, 2023Issue reported in [Link Removed] by [Link Removed] 1. Add one component to the 8K Landscape. [Image Removed] 2. Adding Ocean will not render correctly. [Image Removed] [Image Removed] These ca ...
Anim Graph will hang if the Draw Debug Sphere and Set node are connected and compiled
UE - Anim - Runtime - Anim Blueprints - Jun 8, 2023anim blueprint hangs when compiled. Probably a cyclic issue when compiling. A workaround is to add a delay of any time between the set node and the Draw Debug Sphere node. Repros in the following v ...
Datasmith - Lights imported with incorrect transforms
TM - Interoperability - May 6, 2025Reported in SF [Link Removed] In Twinmotion 2025.1.1, lights imported through Datasmith appear with incorrect transforms. Lights will appear rotated 90 degrees about the Y axis with an offset. Test ...
Layered destructible meshes do not simulate correctly
UE - Simulation - Physics - Destruction - Aug 10, 2015Layered destructible meshes do not simulate in the same way between UE4 and PhysX Lab. The observed issues are: 1) After first fracture no more damage is applied 2) Areas seem to react differently ...
Motion Blur creates dark artifacts on bottom of screen in editor
UE - Graphics Features - Aug 15, 2016When motion blur is active and the view port is in motion there will be a dark artifact visible at the bottom of the screen. Normally this isn't very noticeable however the effect worsens with speed ...
Engine crash when Scene Capture Component 2D is added to viewport with forward rendering
UE - Graphics Features - Nov 26, 2016If forward shading is enabled and shadows are disabled, adding an actor with a SceneCaptureComponent2D and static mesh to the viewport will cause the editor to crash. Regression: Yes - this crash o ...
Actor Position Node Returns Parent Position Not Actor With Material Applied
UE - Graphics Features - Feb 9, 2017The actor position node normally returns the position of the actor with with material applied in world space. As of 4.14 it will return the parent's position rather than the child actor's position t ...