On Wed, 15 Nov 2000 12:00:24 -0500, Rick Mabry wrote:
>Thanks for the macro suggestions. They both worked great for color pigments.
>I am trying to modify them to allow for image_maps --- at present they do
>not seem to accomodate these (due to stretching and such).

In that case, try the modification below.  Make your image maps fit in the
square from <0,0,0> to <1,1,0>.  (If you do that and make them tiled, you can
remove the translates in the macro below as well.)

>>  #macro checker_pigment (Pigment1, Pigment2, Pigment3)
>>          gradient x pigment_map {
>>             [1/3 Pigment1] [1/3 Pigment2] [2/3 Pigment2] [2/3 Pigment3]}

Replace this line with

  [1/3 Pigment1 scale <1/3,1,1>]
  [1/3 Pigment2 translate x scale <1/3,1,1>]
  [2/3 Pigment2 translate x scale <1/3,1,1>]
  [2/3 Pigment3 translate 2*x scale <1/3,1,1>]
  }

>>          warp {repeat x}
>>          warp {repeat y offset 1/3*x}
>>          scale <3,1,1>
>>    #end


-- 
Ron Parker   http://www2.fwi.com/~parkerr/traces.html
My opinions.  Mine.  Not anyone else's.

Post a reply to this message