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On Fri, 21 Dec 2001 19:01:36 +0100, "Marc-Hendrik Bremer"
<Mar### [at] t-online de> wrote:
> AFAIK you should use .hf instead of .gray if you really want what MegaPov
> gave you. That's at least my experience and I think I read it here, too.
You can read at 6.5.4.2 chapter that hf value = (Red + Green/255)*0.996093. So
it not uses Blue for calculation while iirc megapov's engine returned gray value
which is function of all red, green and blue components.
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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