On Fri, 24 Aug 2001 17:24:28 -0400, Jim Kress wrote:
>I have an arbitrarily shaped surface that consists of millions of triangles.
>I know the coordinates of each triangular vertex as well as the normal at
>each vertex.
>
>I also have a line defined by two points and I know the coordinates of each
>point.
>
>How do I calculate the point on the line where the surface and the line
>intersect?

trace(). :)

-- 
plane{-z,-3normal{crackle scale.2#local a=5;#while(a)warp{repeat x flip x}rotate
z*60#local a=a-1;#end translate-9*x}pigment{rgb 1}}light_source{-9red 1rotate 60
*z}light_source{-9rgb y rotate-z*60}light_source{9-z*18rgb z}text{ttf"arial.ttf"
"RP".01,0translate-<.6,.4,.02>pigment{bozo}}light_source{-z*3rgb-.2}//Ron Parker

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