It is possible and supported from the fbx file format. As you can see in blender, for example, is the possibility to use more than one vertex color layer. But the statement '...vertices more than one vertex color' is also wrong, because a vertex has one vertex color for each face he is part of (because you can have faces which are blue, the next one red and you don't want interpolation between the edge). Normally when you use vertex paint mode you don't see this, because you are coloring everything the same. But when you colour it with a algorithm you can do that.
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There was the same question for Unity which, in fact, doesn't support that also. http://answers.unity3d.com/questions/137453/multi-layered-texturing-multiple-vertex-color-sets.html
Aaaand you can see here that assimp also supports importing fbx with more than one vertex color set/layer.
UPDATE
In UE4, you have two options for character reference scale, BSP brush or UE4 Mannequin. For BSP Brush: Go to 'Geometry' tab and create 'Box' BSP brush with following dimensions and align it to the ground plane: Width: 60; Depth: 60; Height: 180; For 'UE4 Mannequin': Go to 'Library', scroll to the bottom and find 'UE4 Mannequin: Mobile'.
I searched the UE4 sources and found this: https://github.com/EpicGames/UnrealEngine/blob/8a80b5541f69a79abf5855668f39e1d643717600/Engine/Source/Editor/UnrealEd/Private/Fbx/FbxStaticMeshImport.cpp#L354 I think that shows that UE4 is only importing the first layer and ignores the rest.
You can also export a imported mesh (from Blender with x vertex color layer as fbx in UE4) as fbx file and only the first vertex color layer is there. I hope this will be added. Breaks the ability of using UE4 for my master thesis.
Inside the Mesh Paint mode panel, there are several options available for using the mesh paint system, each of which has its own settings available for painting vertex color, blending between textures, or painting directly onto the texture file.
Listed below are each of the painting methods available, the tools you can use to work with your vertex color data, the brush settings available while painting, and the view modes available.
Vertex Painting Methods
The Mesh Paint Tool has three different painting modes: Vertex Color Painting, which paints color data directly onto a Meshâs vertices; Vertex Weight Painting, which blends different textures while you are painting; and Texture Weight Painting, which allows painting on textures. The default mode is Vertex Color Painting. The sections below display the options available in each mode.
When you select a method, its settings will populate in the panel under the painting section.
Vertex Color Painting
The Vertex Color Painting mode enables you to paint vertex colors on your mesh, and access its available properties while doing so. You can switch between foreground and background colors (or between paint and erase colors) by pressing the X key.
For the options controlled by sliders, you can click and drag the slider to change the value quickly, or you can click the field and type in a number.
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