Are they not available in free trial version?
It says no here:
http://planetside.co.uk/tg3-feature-comparison
oh. thanks. I am curious if it's possible to read a detailed description of available passes somewhere. Especially what passes I could render form the sky/clouds? Something for clouds relighting or editing in composing soft. Are they shown in a normal or depth pass? Or only alpha? Can I render an alpha without atmosphere ?
Here's a list of the currently available render elements and options:
http://planetside.co.uk/wiki/index.php?title=Render_Layers_and_Render_Elements#Render_Elements
If you have remaining questions after reviewing the docs let us know. You can also request a free 14 day trial of any licensed version of Terragen 3 here:
https://docs.google.com/forms/d/1ZJS3ZFzcd48aFRZgEyWJvcfBdBOOrFiF-DzXeiNu7W4/viewform
- Oshyan