Pleased to meet you Oshyan.
Thanks for the reply and links, but I don't really get any joy from them. They don't tell me what I can do to make things work.
My initial query was because of some plants I got from Xfrog 3.5 Lite. I also noticed many difficulties with things not texturing correctly with exports from Sketchup (2015 in this case).
I have Vue 2014 Complete and have not had these problems with it. They render ok. I don't understand why there's a problem with Terragen.
Here an image from Vue. The same tree renders as a cloud of cotton balls in Terragen.
[attachimg=1]
I just need to know what do I do to fix the problem? I already have the OBJ files and can't change them now.
addendum:
I took the leaf image, which was a red leaf on a white background, and made another .tif file with a black background and the area where the leaf was I left as transparent. Brought it into the shader in T3 in the opacity tab and added it as an opacity image. I didn't change anything else, but it works. I spent 15 or 20 minutes fiddling beforehand and nothing worked.
I checked some other Xfrog exports and they do in fact have images with transparency. It seems inconsistant at this point but I'm sure there's a good reason for it. I just don't know what it is.
cheers,
fleetfoot