Unreal Engine Issues

Navigation mesh is generated ignoring collision for ISM added by construction script

When opening a map with ISM in place, NavOctree is not updated because the ISM bounds are assumed invalid and the geometry is not taken into account in the navmesh build.  The following log output i ...

Calling UBlueprintMapLibrary::GenericMap_Find with a non-existent key causes a memory leak

When Calling UBlueprintMapLibrary::GenericMap_Find with a non-existent key, the function construct the default structure in-place on the given pointer without destroying the object. This behavior ca ...

Modifiers do not behave as expected when adding conflicting mappings of different priorities

UPoseAsset::SetBasePoseName() always sets INDEX_NONE

UPoseAsset::SetBasePoseName() does not correctly set the BasePoseIndex when a valid pose name is provided. Regardless of input, the pose defaults back to ReferencePose. Upon inspection of the implem ...

Nanite TwoSidedSign is backwards

The value of MaterialExpressionTwoSidedSign is flipped when calculating the Opacity Mask for Nanite meshes. This seems to be a regression in 5.5. ...

XR - Volumetric Clouds - VM Clouds appear overtop of meshes in the right-eye

When the user changes the Volumetric Render Target Mode, the Volumetric clouds in a scene will render in front of Static Meshes in the Right-Eye. ...

[CrashReport][Crash] UnrealEditor-Core!IMemoryReadStream::CopyTo()

Intermittent crash in virtual texture transcode. Usually mempy from nullptr but also occasionally we see the same callstack with memcpy to random location. ...

init_unreal.py loads with errors from ML deformer module which has dependencies that are not loaded in -game runs of the editor

LED wall with image / video is not working on Cloud Presentations

Crash when attempting to change the parent of a material instance constant through editor scripting

The built-in class "UMaterialEditingLibrary" provides various editor scripting functions related to creating and editing materials and material instances. One of these functions, UMaterialEditingLib ...