Total, full and ultimate lightmap is overlapping HELP

Development Rendering
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1

Mesh ~100000 verticles imported from blender as OBJ to UE4 (Generate Lightmap UVs is on, Combine Meshes is on). In mesh properties lightmap UVs channel is 0 and is overlapping. How to create in blender second UVs channel and combine some parts of mesh into one big mesh in blender. How settings needs when import this OBJ into UE4.

2

Anyone have idea? In blender in Object data UV Maps adding second UVMap.001, how to translate the first UVMap to second UVMap.001. When importing OBJ file in UE4 lightmap is overlapping, need second UV, but how in blender don’t know.

3

Simple tutorial:

  1. Import OBJ-file in Blender.
  2. Select Geometry of imported file.
  3. Press key U.
  4. Select Lightmap pack.
  5. Check all options and press OK.
  6. In Object data menu change UV layout by add new UVMap.002 and clear previous UVMap.
  7. Export as FBX-file.
  8. Import this FBX-file in Unreal Engine 4.