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On Wed, 21 Nov 2001 09:46:36 -0500, "Stephen" <ssh### [at] echelon ca> wrote:
> The ray intersects the box twice, one going
> in, and one going out of the box ?
The ray intersects box and gives intersection point. Then from intersection
point new ray is sended to the light_source to check shadow appearance. And it
not intersects anything. For two rays you have one intersection. It gives 50%.
ABX
--
#declare _=function(a,b,x){((a^2)+(b^2))^.5-x}#default {pigment{color rgb 1}}
union{plane{y,-3}plane{-x,-3}finish{reflection 1 ambient 0}}isosurface{ //ABX
function{_(x-2,y,1)|_((x+y)*.7,z,.1)|_((x+y+2)*.7,z,.1)|_(x/2+y*.8+1.5,z,.1)}
contained_by{box{<0,-3,-.1>,<3,0,.1>}}translate z*15finish{ambient 1}}//POV35
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