Unreal Engine Issues

Vertex Painting on Blueprint Static Mesh components lost on copy

After vertex painting on a Static Mesh component of a Blueprint, the Vertex paint data is lost when the Blueprint is copied. Oddly, pasting into a text editor shows VertexColorData, but it seems to ...

Crash if editing the key properties of a collapsed key that has only 1 channel keyed

[CrashReport] UnrealEditor-AppFramework!SColorPicker::HandleParentWindowClosed(TSharedRef<SWindow,1> const &) [SColorPicker.cpp:1530]

Generated from CrashReporter This is NOT a regression. Tested in //UE4/Release-4.27 at CL18319896 Tested in //UE5/Main at CL 22175708 - Issue did not occur ...

Reverting a material through source control on Mac causes the thumbnail to become distorted

The thumbnail on mac becomes distorted when the material is reverted through source control. This does not occur on windows and is not a regression. Opening the Material or right clicking on it ma ...

Dithered LOD transitions sometimes briefly flicker to the next LOD before fading

When dithered LOD transitions occur, a brief flash of the next LOD level is first shown on the entire mesh after which the current LOD fades to the next (or previous) LOD. The flashing behavior only ...

Physical Material Masks do not work in non-editor builds

Physical material masks are not working as expected in cooked builds. Licensee reports that the mask data is empty at runtime. ...

Substrate Add node only adds the first Substrate Slab's Emissive value when "Use Parameter Blending" is enabled

As per the steps to reproduce, the Substrate Add node only adds the first Substrate Slab's Emissive value when "Use Parameter Blending" is enabled. Leaving "Use Parameter Blending" unchecked on the ...

Material Parameter Collections are not working on Android v 5 phones from 4.11

Material Parameter Collections are not successfully passing stored values into Materials when packaged for an Android Phone with an OS version of 5. Both version 4 and 6, correctly use the MPC.Test ...

Mesh Painting sometimes fails to paint the closest face in the hovered area

Sometimes it's not catching certain polys as vertex paint targets. Looks like it happens when there's more than one layer of forward facing geometry over the highlighted area, and it just takes the ...

Niagara Mesh Renderer's ParticleColor is not reflected in raytraced reflections

Mesh's ParticleColor is not reflected in raytraced reflections Sprite Particles do not encounter this issue.  ...