Unreal Engine Issues

FBX animations generated under fractional framerates fail to import

We now have the following error that is generated in FFbxImporter::ValidateAnimStackif (!FMath::IsNearlyZero(SubFrame, KINDA_SMALL_NUMBER) && !FMath::IsNearlyEqual(SubFrame, 1.0f, KINDA_SMALL_NUMBER ...

Virtual Texture not streaming with Thin Translucency

When using a virtual texture sampler for a thin translucent material, and that material occludes other objects that sample virtual textures, the occluded objects don't stream their VT. ...

StaticMeshComponent occasionally doesn't simulate physics after SpawActor.

When spawning Pawns with a StaticMeshComponent with SimulatePhyscis=True, they occasionally may not simulate physics. This can be reproduced by simply repeating the respawn. The frequency of reprodu ...

Retainer Box does not propagate Visibility settings to children

This is not a regression. Tested in //UE4/Release-4.27 CL18319896 Retainer Box does not propagate Visibility settings to children. Setting Canvas visibility to 'Not Hit-Testable (Self & All Childre ...

[AI] Moving a SmartObject actor in a level does not update the location of its Slot in the SmartObjectCollection

Moving a SmartObject inside of the level shows that the slot debug view is moved along with the SmartObject, but when PIEing the AI react as if it has not been moved/rotated. You must click Rebuild ...

[AI] Pawns loaded from a Data Layer do not auto-register as sources with the Perception System.

A licensee has reported that Pawns that are loaded via a runtime Data Layer are unable to be perceived automatically by Pawns that are not part of a runtime data layer. However, data layer Pawns can ...

Refraction does not pass through Material Function node Correctly

MaterialInstanceConstant doesn't refresh soft references of non-overridden texture parameter

Observed by a licensee: [Link Removed] When a material instance points to a material, and the material is edited to change a texture and the material and material instance are saved, the material i ...

PNG file import does not read R values correctly

Looking at each value of the texture, it seems that the import of the R value is incorrect. PNG:[Link Removed] TGA:[Link Removed] ...

Motion Matching - PoseSearchDatabaseAsyncCacheTask::CreateKey is nondeterministic

This is caused by use of MakeMemoryView on arrays of structures in PoseSearchFeatureChannels.cpp. Need a proper serialization path for hash key gen here. ...