It turns out that the problem (in addition to the standard numbness of my brain) appears to be the computers I am using.
At work (where I really need your tool) I have a three-year-old Mac Pro running Win7 under Boot Camp with two 30" monitors.
At home I have an i7 860 and an nVidea GTX480 running two 24" monitors.
At work is where I was/am having all the difficulty. At home it works fine. So I chalk it up to the "antiquity" of the setup at work.
In the simple test case attached, I've put a horizontal "road" around the "mountain" (it really is flat even though in perspective it doesn't look like it) and a flat plain to put the "house" on. I also attached two meshes by lifting and joining vertices to make the final mesh. I had to rotate the flat surfaces in two directions to get them horizontal, hence the request that I be able to select one of the chosen vertices (or maybe even another vertex not in the original group) as the final level for all chosen vertices.
I'm still not really clear on the "two points": is one a vertex and the other a point in 3D space in the direction I want to move?
I'm anxious to see what direction you're going to take this tool: it has great potential.
