#Go(ne) Amigo??
15-Mar-91 21:27:50
Sb: #17238-#Go(ne) Amigo??
Fm: Clint H. Woeltjen 72470,104
To: John Pendergrass 76246,676
John:
The topo appearance is _not_ correct. A Vista DEM is 258 points x 258
points, and _each_ point is 30 meters from the next, both in the horizontal
and vertical. This _should_ produce a perfectly square topo, but obviously
it doesn't. The rendering however is based on equally spaced points and the
final 3-d image does come out correct. The Mapping is not 2:1 but more like
the aspect ratio of the monitor, which is about 5:2, or 5:4 for Vista. If
you mapped something to look like a perfect circle on the topo map, it
would _not_ render as a perfect circle, as its depth would be only 80% of
its width.
Clint <VRLI>