Iloco - Gillbrooks gave you the information I had.  

However, I have found that depending how you turn or position any terrain generated in GeoControl will determine your eventual image. What I mean is that I will sometimes generate a terrain that can have more than one eventual image in it. Then,  how I rotate it in Vue (think about the top view) will determine which image I use. So I might construct two images, for example, from one terrain created in GeoControl.