If you have access to TG3 Professional, you can output Render Elements, including Motion Vectors. The Motion Vectors can be used in some 3rd party compositing/video editing software to add motion blur, or you can use the Image File Processor in TG3 to actually add Terragen's 2d motion blur after the fact. It's a lot faster than rendering motion blur in full 3D and the results can still be quite good, plus it's non-destructive if you do it as a post-process this way.
- Oshyan