I just want to stress the importance of the UVmapping step AFTER exporting exporting from Blender and BEFORE importing into Poser (or Daz Studio):
Example here:
Importance of UVmapping by ~ibr-remote on deviantART

After exporting the procedurally-generated city meshes from Blender, it is important to process the mesh to create the appropriate material zones for texturing purposes.

I chose UVmapper and used Box for the new UVmap.

Then I re-saved the OBJ.

The example shows the group of buildings on the left without the new UVmapped material, and the group on the right, with.

The group of buildings on the right work correctly with the city night lights texture shaders, inside Poser.

Eternal Hobbyist