FTimeline::bPlaying may remain false on clients when replaying replicated timeline

UE - Gameplay - Apr 2, 2024

This seems to occur when FTimeline::Stop is called on the client but not on the server, as this will set bPlaying to false locally on the client. Because the value for bPlaying doesn't change on the ...

Reimport FBX does not correctly update frame-rate

UE - Anim - Runtime - Apr 2, 2024

This is an issue with the sequencer model, it does not clear its bPopulated flag so doesn't allow for changing the frame-rate to a non-compatible (multiple/factor off FPS). ...

Issue where some colors are missing in some materials created by importing MaterialX files

UE - Editor - Content Pipeline - Import and Export - Apr 1, 2024

From user: Comparing UE, Arnold, Vray and MaterialXView that have MaterialX files imported, some materials of UE clearly look different from other renderers. Looking into this issue, we found that ...

Enhanced Input does not fire a "Cancelled" event for mappings that were in progress, but removed during a key-rebuild

UE - Gameplay - Input - Apr 1, 2024

If the return value of a trigger goes from ETriggerState::Ongoing to ETtriggerState::None, without returning a ETriggerState::Triggered, then there should be a "cancelled" event that is fired when E ...

CommonUI Analog Cursor + Enhanced Input triggers cause triggers to get stuck when alt-tabbing

UE - Editor - UI Systems - Mar 29, 2024

Came out of [Link Removed] and is related to this one too I think that this is signaling that we need better solutions for input consumption in the engine honestly. This is a constant pain point ...

RewindDebugger visual artifacts when actor's LOD switches during recording when using MetaHumans

UE - Anim - Gameplay - Mar 28, 2024

Rewind debugger sometimes behaves incorrectly during lod switches. Users have found this on a metahuman. ...

UE5.4 Preview 1 produces rendering artifacts on Landscape with World Position Offset

UE - LD & Modeling - Terrain - Landscape - Mar 28, 2024

A material on a landscape with WPO will cause major ghosting, even if that WPO is a dynamic {0,0,0} ,such as from a black texture. ...

Outline artefact on cascade shadow transition

UE - Graphics Features - Mar 28, 2024

Some pixels at the edge between cascaded shadow maps and distance field shadows can be skipped by both, leading to unshadowed pixels. Licensee reports the bug happening in 5.3 as well. Test project ...

Nanite displacement on landscapes not rendering on 5700XT

UE - Graphics Features - Nanite - Mar 27, 2024

This only happens on a 5700XT, tested this on the 7900XT and the issue did not occur  Initially reported on the Preview 1 forums: https://forums.unrealengine.com/t/unreal-engine-5-4-preview/1763516 ...

Camera Shake can apply a new post process material every tick when post process material has "Is Blendable" disabled

UE - Anim - Sequencer - Mar 26, 2024

In the repro project the player camera has a post process material that slightly darkens the frame by subtracting 0.01 from the final color. When a camera animation based on a camera sequence is pla ...