Unreal Engine Issues

Lumen generates gradated shading even if the light is a constant color sky light

Lumen generates a gradated shading even if objects are lit by a 360-degree constant sky light.[Link Removed][Link Removed] I looked into this and found that this comes from Spherical Harmonics int ...

Circular Throbber does not appear to be affected when setting the tint

Circular throbber does not appear to change colors when changing the tint ...

Scene color is copied every draw call if materials read from it (redundant copy optimization is broken)

See TranslucentRendering.cpp // todo: this optimization is currently broken DrawingContext.bSceneColorCopyIsUpToDate = (DrawingContext.TranslucenyPassType == ETranslucencyPass::TPT_Separat ...

Erractic Light Component Behavior in Blueprints

You cannot PIE if you attempt to adjust the Intensity of a Light via the slider in a BP that is placed in the Level already. In addition the color slider does not stay open when editing values for ...

Color changing through material parameter collection in a emissive material will not affect lightmap baking, unless recompile the material.

Adjusting Default Light Settings for Atmospheric Fog causes Crash

Adjusting default light settings in the Color Picker palette for atmospheric fog causes the engine to crash in UE 4.12 Preview Regression: This does not occur in UE4.11 ...

Emissive Input required for Landscape Painting to Appear Correctly when using Emissive Color and Make Material Attributes property Enabled

When using the Make Material Attributes and landscape layer blends, if an Emissive input is being utilized on any one layer, the other layers must also utilize the emissive input in order for it to ...

YCoCg to sRGB?

Both the material and the Niagara compute shader use the same function to interpret the YCoCg color data, but the Niagara compute shader returns an incorrect color. Also found on CL: 32347737 in Re ...

FCustomPrimitiveDataCustomization::SetVectorColor is closing the colorpicker and only updating the first channel

When it updates the red channel, the Simple Construction Script (SCS) gets re-run (via AActor::RerunConstructionScripts) on the Blueprint Actor instance generating new instances of all its component ...

The cloth mask vertexcolor is not updated when re-importing new vertexcolors

The function UClothingAssetFactory::ImportToLodInternal that set the FClothPhysicalMeshData structure is not call again when we re-import so the vertex colors are not updated. ...