Thanks guys.
Just had a thought.
I also have ZBrush, which I think can be used to paint on textures to objects.
Don't know if I will have the same problem with texture export though. I think ZBrush exports a
material file (.mtl) which I don't know what to do with.
I have tried using UV Mapper but the result is too complex for me to texture. A tree is far more complex than a piece of clothing. Thought there might be a way to get XFrog to export an image file texture map that could be applied in Poser. I will do some more reading.