This grass may be slow but the code (IMHO) is ingeniously simple!  A
320x 240 took 23 min to render...

#version unofficial MegaPov 0.5;
#include "colors.inc"
#include "textures.inc"
camera {
  location <2, 40,-146>
  look_at  <2, 15, 0>
  angle 30
}
background {SkyBlue}
light_source{<-70,1200,-120>rgb 1}
#declare fnoise=2;
isosurface{
                function{y/190+
                noise3d(x*fnoise,y*.02*fnoise,z*fnoise)/10
                 }
           accuracy 0.01
           threshold .21
           contained_by {sphere{0,600}}
        pigment{SeaGreen}
        finish{ambient 0.2 diffuse 2}
        }

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"Greg M. Johnson" wrote:
> 
> This grass may be slow but the code (IMHO) is ingeniously simple!  A
> 320x 240 took 23 min to render...
> 

Interesting idea, but not very flexible though.  Adding improvements to the
isosurface function would probably increase render time a lot.  I wonder how
this compares to a tiled noise heightfield.  It would surely need more memory
but the rendering time could be similar or shorter.  

Christoph

--
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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In article <39AA5409.73CE1620@my-dejanews.com>, 
gre### [at] my-dejanewscom wrote:

> This grass may be slow but the code (IMHO) is ingeniously simple!  A
> 320x 240 took 23 min to render...

I did something similar when I was first playing with isosurfaces...I 
got a somewhat good looking landscape with rolling hills, but never got 
anything that looked like a convincing grass. And the functions got much 
more complex than this.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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