Only 3 or 4 people?  Seriously?

Well, you certainly seemed serious!  Impressive and astonishing work so far for them, I've been watching TG scenes appear for years but only recently broke down and tried it out.  Having spent some brutal time in the arch/viz industry using Maya, it's impressive to me that 3 or 4 people can do such a great job on TG whereas Alias/Autodesk with their massive billions still can't get terrain generation down in Maya out of the box...

And this also explains why they didn't include a raytracing/refraction engine, I'm sure they were focusing on landscape/terrain generation (thus, Terragen) instead.  Thanks for clearing that up for me!