Unreal Engine Issues

CreatePatchLibrary is broken

It seems the FEditorShaderCodeArchive.LoadExistingShaderCodeLibrary missed some functions, use FEditorShaderCodeArchive.AddShaderCodeLibraryFromDirectory instead could fix the issue. ...

No warning is shown when a disabled mobile shader permutation is required for rendering

Fbx importer crash when reordering material array

Its possible to have a fbx file which as unused material in the fbx node. The reorder material function is not handling this case. ...

Need to remove dependency on log2 on Android for older versions

The log2 function does not exist in libc.so on older Android. Using FMath::Log2 instead solves the issue. ...

External textures only work in pixel shaders

External textures currently only support pixel shaders, presumably because some platforms, such as Android only have pixel shader support. On other platforms this causes a regression though: For exa ...

[CrashReport] UE4Editor_CoreUObject!UStruct::IsChildOf() [class.h:373]

Comments from users:I pressed Play while having a directional light selected in-editorChanged landscape collision mip level. ...

Niagara crash when duplicating an emitter in the timeline through right-click menu

Trying to duplicate an emitter from the timeline crashes the editor. This looks to be the result of UMovieSceneNiagaraEmitterTrack not implementing the function SupportsType.  ...

Mutable - morph does not work for a skinned mesh with more than one uv channel

The morph functionality fails to change when the skinned mesh contains more than one UV channel in a Customizable Object. ...

Rotating terrain with heightmap causes black splotches on terrain

Rotating a landscape with a heightmap causes lightmass to break, rendering black splotches across terrain after building lighting. ...

Crash in the Blueprint Debugger.

After creating a few different Blueprints in the editor and adding a breakpoint to a Function, a crash ensues when using Step In to debug the Blueprint. ...