On Tue, 04 Dec 2001 20:31:12 -0500, Andrea Ryan wrote:
> pointing the y axis up.  But positive rotation is clockwise with POV and
> counterclockwise with math classes.  So if POV-Ray adopted y as up, why
> not positive rotation as being counterclockwise?  I hope that I'm wrong
> about this otherwise there would be a self-contraction.

Because POV also adopted z as into the screen, which is not how it works
in math.

--
#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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