Vojtech Spiwok <spi### [at] vschtcz> wrote:
> I would like to render a picture of object (protein)
> with a depth cueing. Simple z-oriented ground fog does
> not work because if the fog distance is too small the
> picture is almost white and when it is large there is
> almost no depth-cueing efect.

  How about this?

camera { location -z*8 look_at 0 angle 35 }
light_source { <100,150,-400>, 1 }
fog
{ rgb <1,1,1>
  fog_type 2
  distance .1
  fog_offset -.5
  fog_alt .2
  up -z
}

union
{ sphere { <-1,-1,-1>, .2 }
  sphere { <-1,-1, 1>, .2 }
  sphere { <-1, 1,-1>, .2 }
  sphere { <-1, 1, 1>, .2 }
  sphere { < 1,-1,-1>, .2 }
  sphere { < 1,-1, 1>, .2 }
  sphere { < 1, 1,-1>, .2 }
  sphere { < 1, 1, 1>, .2 }
  cylinder { <-1,-1,-1>,<-1,-1, 1>, .1 }
  cylinder { < 1,-1,-1>,< 1,-1, 1>, .1 }
  cylinder { < 1, 1,-1>,< 1, 1, 1>, .1 }
  cylinder { <-1, 1,-1>,<-1, 1, 1>, .1 }
  cylinder { <-1,-1,-1>,<-1, 1,-1>, .1 }
  cylinder { < 1,-1, 1>,< 1, 1, 1>, .1 }
  cylinder { < 1,-1,-1>,< 1, 1,-1>, .1 }
  cylinder { <-1,-1, 1>,<-1, 1, 1>, .1 }
  cylinder { <-1,-1,-1>,< 1,-1,-1>, .1 }
  cylinder { <-1, 1, 1>,< 1, 1, 1>, .1 }
  cylinder { <-1,-1, 1>,< 1,-1, 1>, .1 }
  cylinder { <-1, 1,-1>,< 1, 1,-1>, .1 }
  pigment { rgb x } finish { specular .5 }
  rotate <-60, -30, 0>
}

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