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#declare F1=function{pattern{wood sine_wave turbulence 0.2}}
#declare F2=function(u,v){F1(u/3,v/3,0)}
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#include "meshmaker.inc"
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object { // TwoVarSurf( __Fuv, Urange, Vrange, Iter_U, Iter_V, FileName )
         // Builds a mesh2 surface of a function with two variables (u,v). 
         // The uv_coordinates for texturing the surface come from the square <0,0> - <1,1> 

   TwoVarSurf(     F2, // The function to be turned into a mesh2 object.
                       // the ranges within which the surface is calculated: 
               <-6,6>, // 2-D vector that gives the boundaries of u. 
               <-6,6>, // 2-D vector that gives the boundaries of v.
                 200, //  resolution of the mesh in the u range 
                 200, //  resolution of the mesh in the v range. 
                ""  // FileName: ""= non, "NAME.obj'= Wavefront objectfile, "NAME.pcm" compressed mesh file 
                    // "NAME.arr" include file with arrays to build a mesh2 from,
                    //  others: includefile with a mesh2 object 
             ) // ---------------------------------------------------------------------------------
 texture{ 
   uv_mapping
   pigment{checker color rgb <0,0,0.2> color rgb <1,0.85,0.85> scale 1/6}
   finish{specular 0.4}
 } //  
   scale <1,1,1>*1
   rotate <90,0,0>
   translate<0,0,0>
} // end of object
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