The default scene has changed for Terragen 3, the guide needs to be updated. We have tried to make the default scene more useful and illustrative to begin with. You can still follow the First Scene document roughly, but first skip to just after the Heightfield is generated (top of page 3), ignore any references to the Heightfield Shader from then on, and then at the end of page 4 where it tells you to add a Fractal Terrain, just skip right past that as the new default scene includes such a terrain already. All the rest should apply fairly well still.
- Oshyan