#declare foo = function {
   pattern {
     checker
   }
}

.....

texture {
    foo       //replace built-in pattern with previous declaration
    texture_map {
      [0.3  pigment{Red} finish{phong 1}]
      [0.3  T_Wood11]    //this is a texture identifier
      [0.6  T_Wood11]
      [0.9  pigment{DMFWood4} finish{Shiny}]
    }
}

The above are taken from the documentation. Thanks in advance

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For some reason the following was deleted from the start of my post:

"I want to use a texture map with a user-defined pattern function (as
opposed
to the in-built ones). Is this possible? The texture_map documentation
seems to imply that the pattern you specify is simply a function, and the
documentation on patterns says you can define pattern functions, but when
I've attempted to put the two together the parse fails with an 'expected
pattern, found function' error. Is it shoddy syntax or am I trying to do
the impossible?"

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Queex <nomail@nomail> wrote:
>     foo       //replace built-in pattern with previous declaration

  The correct syntax for that line is:

      function { foo(x, y, z) }

-- 
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}//  - Warp -

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Thanks. Thought it would be something that simple.

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