Can anyone elaborate on fortnites HLOD Proxy mesh destruction system?

“Once that is completed, we would then need to modify how Mesh Merging is used with HLOD to add the ability to copy the Max LOD and apply custom vertex colors to the newly generated Static Mesh.
Note that the Vertex Colors should be quantized such that using R, G and B gives 65k in values which should be more than we need.”

Would anyone be able to elaborate on this setup from the fortnite HLOD proxy LOD destruction system guide?

I don’t understand how we can setup something automatic to custom map the vertex colours to new proxy meshes, i also don’t understand what it is referring to when it says R G AND B gives 65k in values. Could anyone elaborate?