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On Tue, 2 Oct 2001 22:29:02 -0500, Mike Hough wrote:
>Btw, the offset in the map was an error with the orginal DEM files the USGS
>released. The non-square data is saved as a part of a square to prevent
>distortion without scaling.
No, the offset in the map is because UTM is not "square" unless you're on
a meridian. If you account for the projection, that problem goes away. I
used to write GIS software; I dealt with USGS products all the time.
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#macro R(L P)sphere{L __}cylinder{L P __}#end#macro P(_1)union{R(z+_ z)R(-z _-z)
R(_-z*3_+z)torus{1__ clipped_by{plane{_ 0}}}translate z+_1}#end#macro S(_)9-(_1-
_)*(_1-_)#end#macro Z(_1 _ __)union{P(_)P(-_)R(y-z-1_)translate.1*_1-y*8pigment{
rgb<S(7)S(5)S(3)>}}#if(_1)Z(_1-__,_,__)#end#end Z(10x*-2,.2)camera{rotate x*90}
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