Well, i dont want to be rude, but from your reasoning i really doubt you did that demo. It uses Microsofts Skinned mesh model, and that means you had to animate it using Direct3D since that mesh file is an X file. From what i have read here you dont have a clue what Direct3D really is, and what it is used for.
And i KNOW i have seen that "Demo" somewhere else, most likely in a MS tech demo or something similar. And check out the DirectX Sample Browser that comes with the latest SDK releases, it has an almost exactly similar demo there, except it dont render a landscape but a quad instead.
If you REALLY have done that demo, then i apologize, but frankly, im almost 100% sure you havn't since i KNOW i have seen it before a long time ago.
// Allmight
-------------------------------------------------Founder and DirectorAllSoft Studios
if not mistaken, another poster pointed out that his demo was derivative (possibly stolen) from the Frank Luna book "Introduction to 3D Game Programming with DirectX" ... derek7 even admits it a few posts later.
"It is pitch black. You are likely to be eaten by a grue." > what is a grue?
I'm still confused by this whole thread. Regardless, generally when you have a question what is ____? The best place to start is wikipedia. Here's the Direct3D entry.