The colours on this tree are only two materials. I was assuming that i didn’t need any UV mapping since this is a simple case but it seems like ue4 isn’t importing my materials at all.
I haven’t been able to export/import a mesh with more than one material using the new 7.4 FBX exporter. When exporting, choose the old 6.1 FBX option from the “Version” dropdown until you’re ready to create meshes using only single materials (the preferred method).
To correct the all-black mesh, your mesh needs a lightmap. That’s a second UV channel that UE4 will use to lighting/shadow information. The down-and-dirty method:
select your object in Blender
click the triangle button (next to the material sphere)
under “UV Maps” click the + twice to add two channels (lightmap goes on the second)
hit “tab” to enter edit mode, select all faces (“a” twice usually does it)
top of the screen, switch from “Default” to “UV Editing” screen layout
“UVMap.001” (second UV map) is selected (left window bottom, next to grid-snap)
mouse over the right window, hit “U”, choose “Smart UV Project”, OK and you’re done
