Unreal Engine Issues

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. ...

On Drop appears to cause update issues with widgets that are affected On Drag Enter

On Drop appears to cause update issues with widgets that are affected On Drag Enter. In this example the widget only changes colors if a delay is placed in the On Drop function. The On Drop function ...

The RGB values of materials on FBX files are not correctly imported.

When importing an FBX file with simple RGB color they are not importing with the same color as its original value with either interchange or mootools.  When opening the attached FBX file in 3dsmax ...