Very old tutorial, it requires basic knowledge of terragen/photoshop, and a lot of patience if you're new to terragen. (since you will need to follow another tutorial first)
Links I mention in the tutorial:
Terragen Rendering Tutorial -
http://tutorials.passportstudios.com/terragen_tutorial.html
Terragen Resource Pack -
http://tutorials.passportstudios.com/Terragen%20Resources.rar
(For clarification: I made the tutorial and resource pack mentioned)
Linear Mode
