Can anyone please explain why this:

density { checker }

and this

density { checker rgb <1,0,0>, rgb <0,0,0> }

give errors, while this:

density { checker density { rgb <1,0,0> }, density { rgb <0,0,0> } }

works just fine?

Here's the whole scene:

// scene starts here
// ------------------

#include "colors.inc"

box
{
  -.99, .99
  interior
  {
    media
    {
      emission 1
      absorption 2
      intervals 20
      samples 10, 20
      variance 1/255
      confidence 0.999
      density { checker density { color White }, density { color Black
} }
    }
  }
  
  hollow
  pigment { Clear }
}

camera
{
  location  <1.0 , 2.0 ,-3.0>*.8
  right x
  look_at   <0.0 , 0.0 , 0.0>
}

background { color red 0.1 green 0.3 blue 0.8 }

// scene ends here
// ------------------

Thanks in advance.


---------
Peter Popov
ICQ: 15002700

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