Hi Folks,

Thanks to everyone for their kind words. The feeling of the scene is
close to what I was trying to get - closed in, fairly precarious
viewpoint, the open sky only hinted at by the indirect sky lighting.

Very little math here, just some blobbed shperes and applied noise - a
lot of trial and error. Getting the light to shine down along one wall
and onto half the water, so that only caustics and radiosity light the
other wall, took the most fiddling.

Speaking of trials, I'll include the isosurface function for the image
attached (test image - no photons or radiosity).

I'm working on the texture map at the moment, so I'll leave you to add
your own :-)

Bye for now,
	Mike Andrews.

Mick Hazelgrove wrote:
> 
> Superb image. I just wish I had your mathematical skills
> 
> Mick
> 
> --
> *************************************************************
>        http://www.minda.swinternet.co.uk/index.htm
> 
> *************************************************************

--- start of PoV fragment ---

#declare fnNoise = function { noise3d(x+100,y+100,z*15) +
0.5*sqr(noise3d(x+10,y*50,z+10)) + 0.1*noise3d(x*60,y*60,z*60) }
#declare fnSph = function { "R" }
#declare fnSphB = function { sqr(max(0,1-sqr(fnSph(x,y,z)))) }

#declare vX = 1/0.3;
#declare vY = 1/2;
#declare vZ = 1/1;
#declare vM = max(vX, max(vY, vZ));

#declare fnCanyon = function { 
  fnSphB(x*vX,y*vY,z*vZ) + 0.15*fnSphB(x*0.5*vX,(y+0.8)*vM,z*0.5*vZ) +
fnSphB(x*0.6*vX-0.5,(y-1.2)*0.5*vX,0) - 0.1
}

isosurface {
  function { fnCanyon(x-0.2*(noise3d(10,100,3*z)-0.5),y,z) -
0.1*fnNoise(x,y+0.1*x,z) }
  bounded_by { box { -<2/vX,1.3/vY,1.5/vZ>, <2/vX,1.2,1.5/vZ> } }
  eval
  texture {
    function { noise3d(x+10,(y+0.1*x)*50,z+10) }
    texture_map { 
      [ ... ]
    }
  }
  scale 30
  matrix <1,0,0, 0.3,1,0, 0,0,1, 0,0,0>
}

--- end of PoV fragment ---

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