Unreal Engine Issues

Cannot get Texture Size property from Texture Collections

The following error is shown when attempting to use the Texture Size of a Texture Collection texture object: Texture size only available for Texture2D, TextureVirtual, Texture2DArray, VolumeTexture ...

SplineMeshComponent resources leak

A race condition occurs in the InitSplineVertexFactory_Internal }}function call, which is distributed across multiple threads. This causes {{FSplineMeshVertexFactory to be instantiated multiple time ...

Intermittant motion blur issues in content heavy scenes

When using the following RHI/Render thread/GT sync configuration:r.OneFrameThreadLag 1r.GTSyncType 1 The previous skinning bone data can be corrupted and introduce visual artifacts on everything us ...

Sequencer binding resolve fails in packaged builds for actors in non spatially loaded Level Instances

GPU Validation texture barrier errors for SkyAtmosphere component

A licensee reported that two SkyAtmosphere texture resources do not have proper memory transitions added by the RDG. This happens because in VolumetricCloud.usf, these textures are referenced via Vi ...

Translucent meshes randomly flicker when using VSM

Flickering can occur on translucent materials, usually in the distance when there is at least one directional light and when using VSM. Flickering seems highly dependent on framerate and timing. L ...

Non-Nanite meshes not being correctly cleared from all levels of VSMs on actor destruction when r.Shadow.Virtual.NonNanite.IncludeInCoarsePages=0

When using the r.Shadow.Virtual.NonNanite.IncludeInCoarsePages=0 to optimize VSM performance there are errors in how the VSM is invalidated when actors are destroyed with non-Nanite meshes. The curr ...

Crash when applying Decal material with Distance Cull Fade node to Decal Actor

The Editor crashes when applying a Material with a Distance Cull Fade node to a Decal Actor. Fatal error: [Link Removed] [Line: 730] Missing uniform buffer at slot 2, stage SF_Pixel. Please check ...

check(bRenderStateCreated) fires in SendRenderDynamicData_Concurrent called from FRegisterComponentContext::Process

FRegisterComponentContext::Process() in ActorComponent.cpp iterates over SendRenderDynamicDataPrimitives and calls SendRenderDynamicData_Concurrent() on each. The existing guard checks ::IsValid(Pri ...

Wrong WPO motion vectors due to Periodic World Space node

We've noticed smearing in grass due to wrong motion vectors. This appears to be caused by lack of previous frame support in the periodic world space node. This is how we fixed it: In MaterialTempl ...