I'm having a problem getting the 'sky' in my background image, transparent. I've - saved the image ( 2 diff xpacks) in jpeg and dds, with the sky blacked out. - in xpacker, imported via texture into materials - size ok, Diffuse only, Transparency alpha, Use as wall only - save into BTB, - use as material on wall. Black sky evident - export to RBR - sky, of image, black Many thanks for your time. I,ve just read back 20 pages of the forums and found lots of interesting DIY,s with BTB. It might be a bit frustrating coming up against these problems but it doesnt half make it interesting.