/*
Pov3 Parametric equation template-
*/
/*SWALLOWTAIL*/
/*
Make files as indicated

echo u*pow(vv,2) + 3*pow(vv,4) >uuvv.x
echo -2*uu*vv - 4*pow(vv,3)   >uuvv.y
echo uu                       >uuvv.z
*/

#include "colors.inc"
#include "textures.inc"
#version 3.0
#declare tofile = 0    //set to 1 for debug to file, change .ini

global_settings { assumed_gamma 1.0 }
/*
Put any other constants in the eqns. here
*/
#declare a=0.5
#declare b=1.5
#declare c=1
#declare uiter = 40            //Number of steps (lengthwise)
#declare viter = 40            //and across. Edit these for better res.

#declare vmin  = -0.8         //Endpoints in the
#declare vmax  = 0.8         //parametric rectangle.
#declare umin  = -2           //I.e. min and max uu and vv
#declare umax  = 2

//Simple textures for triangles
#declare simple1 =  texture{
                      pigment {checker color Gray60, color Green}
                      finish {ambient 0.2 specular 0.7 roughness 0.05 }
             scale 0.15              }
#declare simple2 =  texture{
pigment {
    bozo
    color_map {
        [0.0, 0.4 color rgb <0.8, 0.0, 0.0>
                  color rgb <0.4, 0.0, 0.4>]
        [0.4, 0.6 color rgb <0.4, 0.0, 0.4>
                  color rgb <0.0, 0.0, 0.2>]
        [0.6, 1.0 color rgb <0.0, 0.0, 0.2>
                  color rgb <0.0, 0.0, 0.0>]
    }
}


                     
                      finish {ambient 0.3 specular 0.5 roughness 0.05 }
                           }

//Lights, camera, action
camera
{ location  < 15, 9,-15>
  direction  1*z
  look_at   < 0, 0, -1>
} 

light_source { <-10, 29,-19> color rgb 1 }
light_source { <23, 20, -15> color rgb 1 }
object {box{-30,30 inverse}pigment{color rgb 0.6}}
//object {plane{ y,-29.5 pigment{checker color Black color PaleGreen}}}


//OBJECT DECLARED HERE 
#include "paraloop.inc"
//Returns a mesh named surface
object{ surface
texture {simple2
/*
    pigment {
        granite
        color_map {
            [0.0, 0.3 color rgb <0.82, 0.57, 0.46>  
                      color rgb <0.82, 0.57, 0.46>]
            [0.3, 0.6 color rgb <0.0, 0.0, 0.0>
                      color rgb <0.85, 0.85, 0.95>]
            [0.6, 1.0 color rgb <0.82, 0.57, 0.46>  
                      color rgb <0.85, 0.85, 0.95>]
        }
    }
    finish {
        metallic
        brilliance 6.0
        reflection 0.25
        phong 0.75
    }
*/
}


rotate <90,70,0>     //This is just changing the
rotate <0,180,0>     //coordinate system.
scale 3
translate<0,0,-2>
}