#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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