Using 2 Texture-Atlas for UV Mapping a Mesh , How do I setup same Configuration in Unreal Engine 4 I UV mapped My Level using 2-3 Texture-Atlases in blender , Now I have to export whole Mesh in Unreal Engine 4. 
How do I setup Material-Mesh so that I read UV Map from Both Texture-Atlas.
if you have different material slot for reference to this atlases - just make 2 materials with different textures. if slot one - you can multiply two textures or make some lerp by mask