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 ...

Landscape raytracing geometry always updates every frame

LOD 0 Landscape meshes are always updated in FLandscapeComponentSceneProxy::GetDynamicRayTracingInstances because* r.RayTracing.Geometry.Landscape.LODsUpdateEveryFrame* (GLandscapeRayTracingGeometry ...

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. ...

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

SKP import - Mirrored groups will display with the default material in Keep Hierarchy imports

Reported in SF [Link Removed] SketchUp models containing grouped elements that are mirrored will incorrectly display these elements with the default material when imported using the Keep Hierarchy ...

Animation - Imported fbx animation mesh appears distorted

Reported by user in SF [Link Removed] An animated FBX file from Mixamo appears with a distorted mesh inside Twinmotion. Distortion appears regardless of settings used for import. ...

"Browse to Asset" on Level Instances browses to both the level instance and the current level in the content browser

Iris - large fast arrays serialize multiple elements when only one is dirtied

This seems to be a result of how the changemask is handled for fast arrays. Because the changemask is a fixed set of bits (defined by IrisFastArrayChangeMaskBits), a single bit can represent multipl ...

Incorrect volume bounds check in FTranslucentLightInjectionCollector::AddLightForInjection

The 'VolumeBounds' array in FTranslucentLightInjectionCollector::AddLightForInjection is accessed as a pointer instead of with 'VolumeCascadeIndex' and thus fails bounds checks for the outer volume. ...