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On Fri, 28 Sep 2001 00:29:01 -0400, Nathan Kopp wrote:
>
>"Jan Walzer" <jan### [at] lzer net> wrote...
>> sor {
>> #declare Value=0.2
>> 5,
>> <0.0, -1.0>
>> <0.0, -0.5>
>> <Value, 0.5> // <------ change Value to 0.15 or lower ... and
>see
>
>It is possible that the first two points, combined with a third point with a
>height of 0.15, will cause the cubic spline to dip below a height of 0.0.
>That would cause problems for the root solver. Render with the values below
>to see how the curve is concave, and how two zero-height points could cause
>the SOR height to drop below 0.0.
>
>Therefore, this is not really a bug, but a strange limitation of the SOR
>object.
It might be a bounding thing, too. I'm not sure the bounding routines really
care for negative-radius cylinders.
--
#local R=rgb 99;#local P=R-R;#local F=pigment{gradient x}box{0,1pigment{gradient
y pigment_map{[.5F pigment_map{[.3R][.3F color_map{[.15red 99][.15P]}rotate z*45
translate x]}]#local H=pigment{gradient y color_map{[.5P][.5R]}scale 1/3}[.5F
pigment_map{[.3R][.3H][.7H][.7R]}]}}}camera{location.5-3*z}//only my opinions
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