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//-------------------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------------------
#include "meshmaker.inc"
//-------------------------------------------------------------------------------------------------
#declare Set=2; //1, 2, 3 or 4

#switch (Set)
  #case (1)
    // The set of functions is not declared, but directly defined in Parametric.
  #break
  
  #case (2)
    // Set below is for use with Parametric. 
    #declare F1= function(u,v){sin((u/3)-(7*v)) + 2*sin((u/3)+v)}
    #declare F2= function(u,v){cos(u)*((7+cos((u/3)-(7*v))+(2*cos((u/3)+v))))} // "-2*v" -> "-7*v"
    #declare F3= function(u,v){sin(u)*((7+cos((u/3)-(7*v))+(2*cos((u/3)+v))))}
  #break
  
    // The two sets below are for use with Paramcalc. The functions or macros
    // need to have the names __Fx, __Fy, __Fz.
  #case (3)
    #declare __Fx= function(u,v){sin((u/3)-(2*v)) + 2*sin((u/3)+v)}
    #declare __Fy= function(u,v){cos(u)*((7+cos((u/3)-(2*v))+(2*cos((u/3)+v))))}
    #declare __Fz= function(u,v){sin(u)*((7+cos((u/3)-(2*v))+(2*cos((u/3)+v))))}
  #break
  
  #case (4)
    #macro __Fx(U,V)sin((U/3)-(2*V)) + 2*sin((U/3)+V)#end               
    #macro __Fy(U,V)cos(U)*((7+cos((U/3)-(2*V))+(2*cos((U/3)+V))))#end
    #macro __Fz(U,V)sin(U)*((7+cos((U/3)-(2*V))+(2*cos((U/3)+V))))#end
  #break
#end
//-------------------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------------------
object {
  
  #if (Set=1) 
    Parametric(
      function(u,v){sin((u/3)-(2*v)) + 2*sin((u/3)+v)}             
      function(u,v){cos(u)*((7+cos((u/3)-(2*v))+(2*cos((u/3)+v))))}
      function(u,v){sin(u)*((7+cos((u/3)-(2*v))+(2*cos((u/3)+v))))}
      <-pi, -pi>, < pi, pi>,
      50,50,""
    )
  #end
  //-----------------------------
  #if (Set=2) 
    Parametric(
      F1, F2, F3,
      <-pi, -pi>, < pi, pi>,
      50,50,""
    )
  #end
  //-----------------------------
  #if (Set=3 | Set=4)
    Paramcalc(
       <-pi, -pi>, < pi, pi>,
       50,50,""
    )
  #end
  //-----------------------------
  /*
   interior_texture {    // inside texture
     uv_mapping
     pigment{ checker color rgb <0.5,0.0,0.1> rgb <1,1,1> scale <0.015 ,0.025,0.01>}
     finish { specular 0.25}
   } // 
  */
   texture{      // outside (interior_texture)
    // uv_mapping
     pigment{ color rgb <1,1,1> } 
    // pigment{ checker color rgb <0.0,0,0.0> rgb <1,0.9,0.9>  scale <0.015 ,0.025,1>}
     finish { phong 0.5 }
   } // 
   
   rotate< 0,0,90>
   scale< 1,1,1>*0.18
   translate< 0,0,0 >
} // end of object 
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