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The lower right one is what I want, but I don't get it.
my color_map -
[0.0 rgb 0.5 transmit 1.0 filter 0]
[0.3 rgb 1.0 transmit 0.7 filter 0]
[0.9 rgb 0.0 transmit 0.1 filter 0]
[1.0 rgb 0.0 transmit 0.0 filter 0]
What POvray version you have used?
No, I don't want to make craters. Its part of an automatic vegetation
distribution approach.
Norbert Kern
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Attachments:
Download 'problem3.jpg' (55 KB)
Preview of image 'problem3.jpg'
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"Norbert Kern" <nor### [at] t-online de> wrote in message
news:web.44a5fb529c5d72994c493f840@news.povray.org...
> #declare areal = plane {y,0}
> #declare r1 = seed(1);
> #declare n = 0;
> #while (n < 200)
> #declare X = rand(r1)*hfscalx*2;
> #declare Z = rand(r1)*hfscalz*2;
> #declare Norm = <0,0,0>;
> #declare Start = <X-hfscalx,100,Z-hfscalz>;
> #declare Inter = trace (areal,Start,-y,Norm);
> #if (vlength (Norm) != 0)
> object {
> thingy
> scale (0.7+0.6*rand(r1))
> translate <Inter.x,0,Inter.z>
here's your problem: transparency only works as expected if the
transparent object is, in this case, higher than the background.
so, change translate <Inter.x,0,Inter.z> into translate
<Inter.x,rand(r1)*.1,Inter.z>, and you'll get the desired effect.
cu!
--
#macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
#end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
_(0x+y.5+y/2x)_(0x-y.5+y/2x) // ZK http://www.povplace.com
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"Zeger Knaepen" <zeg### [at] povplacecom> wrote:
> here's your problem: transparency only works as expected if the
> transparent object is, in this case, higher than the background.
> so, change translate <Inter.x,0,Inter.z> into translate
> <Inter.x,rand(r1)*.1,Inter.z>, and you'll get the desired effect.
Thank you Zeger, this helped a lot!
Norbert Kern
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Norbert Kern wrote:
>
> interesting, but in the end I want to do it with more than 1000000 discs.
> IIRC you can add so many patterns in a single function.
>
Then use branches:
fa = max(fb, fc)
fd = max(fe, ff)
fg = max(fa, fd)
You're only going to see a white blob with 1 million discs. To get an
idea, set your background to rgb <0,0,0> and place 1 million discs with:
color_map {
[0.0 rgb 1.0 transmit .5 filter 0]
[0.3 rgb 1.0 transmit 0 filter 0]
[0.9 rgb 1.0 transmit 1 filter 0]
[1.0 rgb 1.0 transmit 1 filter 0]
}
Won't be exactly what you're trying to do, but it will give you an idea
(until you reach max_trace_level).
-Shay
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