Unreal Engine Issues

LODs with screen size 0 in legacy assets are incorrectly converted to 1 on load

When loading a mesh asset (static or skeletal) created in an old version of Unreal (e.g. 4.10), any LOD whose LOD screen size was originally set to 0, is converted to 1. This causes LODs that would ...

Crash when opening a texture or editing its properties after stopping a preview in the material editor

When a texture asset has certain properties edited, its PostEditChangeProperty() method calls to UTexture::NotifyMaterials(), which triggers a recompilation of materials that reference it in their m ...

SpringArmComponent with "Use Camera Lag Substepping" does not handle fluctuating frame rates correctly

The description of SpringArmComponent's "Use Camera Lag Substepping" option says "sub-step camera damping so that it handles fluctuating frame rates well". However, as noted and explained by a licen ...

USplineComponent still editable in viewport despite setting as "read-only".

A spline component continues to be visible and editable in-editor despite all attempts to disable the functionality through the component's settings or uproperty specifiers. ...

The pak file specified in PakFileRules is not created correctly

The rules by which chunks are created are ambiguous and currently do not ensure that both PakFileRules and PrimaryAssetLabel settings are reflected. In this sample, depending on the PrimaryAssetLabe ...

CachedMaxDrawDistance value are not updated by CullDistanceVolume in persistent Level

in PIE, RerunConstructionScript() is executed and actor's CachedMaxDrawDistance is updated as expected. in packaged game, RerunConstructionScript() is not executed  so, CullDistanceVolume is not u ...

Merge actor issue with similar materials

FPackageName::SearchForPackageOnDisk fails to find maps when using IOStore

This bug was discovered by a user who tried changing level through the 'servertravel' console command (HandleServerTravelCommand).  Debugging shows that FindFilesAtPathInIndex won't return anything ...

CookAdditionalFiles - WriteSharedFile function that allows multiple packages to generate the same file

Dependency on [Link Removed], which specifies that CookAdditionalFiles should take a context object. Keep the existing WriteAdditionalFile function that is an argument to CookAdditionalFilesOverrid ...

CookAdditionalFilesOverride Context struct

virtual void UObject::CookAdditionalFilesOverride allows non-package files to be copied or created during the cook whenever a UObject of your class is in a package that is cooked. This is useful for ...