SharkD wrote:
> I may have asked this before, but what are some good ways to create 2D 
> textures that tile? 

In 2D space you can use diamond tiling:

#declare repeatable_pattern=
pigment{
  cylindrical rotate x*90 scale 1.00
  pigment_map{
   [0 rgb 0]
   [1 crackle scale .5]
  }
}

plane{z,0
  pigment{
   average
   pigment_map{
    [1 repeatable_pattern translate -x]
    [1 repeatable_pattern translate x]
    [1 repeatable_pattern translate -y]
    [1 repeatable_pattern translate y]
   }
   translate(x+y)
   warp{repeat x*2}
   warp{repeat y*2}
  }
}

or square tiling:

#declare repeatable_pattern=
pigment{
  cylindrical rotate x*90 scale 1.50
  pigment_map{
   [0 rgb 0]
   [1 crackle scale .5]
  }
}

plane{z,0
  pigment{
   average
   pigment_map{
    [1 repeatable_pattern translate<-1,-1,0>]
    [1 repeatable_pattern translate<1,-1,0>]
    [1 repeatable_pattern translate<-1,1,0>]
    [1 repeatable_pattern translate<1,1,0>]
   }
   translate(x+y)
   warp{repeat x*2}
   warp{repeat y*2}
  }
}

where "repeatable_pattern" is a pigment you wish to use in excess.

> Secondly (and this is the more advanced part), how might I turn tiling 
> on and off for a particular direction? 

I think perhaps you'll be keeping track of where the break in repetition 
occurs, so for a tile which repeats using diamond tiling, with a break 
in repetition to the right:

  pigment{
   average
   pigment_map{
    [1 repeatable_pattern translate -x]
    [1 non_repeatable_pattern translate x]
    [1 repeatable_pattern translate -y]
    [1 repeatable_pattern translate y]
   }
   translate(x+y)
   warp{repeat x*2}
   warp{repeat y*2}
  }

might suffice.

I hope this helps somewhat.

Sam

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