// Persistence of Vision Ray Tracer Scene Description File
// File: ?.pov
// Vers: 3.6
// Desc: Basic Scene Example
// Date: mm/dd/yy
// Auth: ?
//
         

#version 3.6;

#include "colors.inc"

global_settings {
  assumed_gamma 2.1    
  // used in global_settings, sets an overall brightness/ambient light level in the scene
  ambient_light color rgb <1,1,1>/10
}

// ----------------------------------------

camera {
  location  <+0.3, 0.5, -4.0>     // -0.2  0.0  +0.2    //  -0.3 -0.1 +0.1 +0.3
  direction 1.5*z
  right     x*image_width/image_height
  look_at   <0.0, 0.0,  0.0>
}

sky_sphere {
  pigment {
    gradient y
    color_map {
      [0.0 rgb <0.6,0.7,1.0>]
      [0.7 rgb <0.0,0.1,0.8>]
    }
  }
}

light_source {
  <-50, 40, -60>            // light's position (translated below)
  color rgb <1, 0, 0>  // light's color
}     

light_source {
  <50, 40, -60>            // light's position (translated below)
  color rgb <0, 1, 0>  // light's color
}

light_source {
  <0, 190, -60>            // light's position (translated below)
  color rgb <0, 0, 1.1>  // light's color
  
}

// ----------------------------------------

plane {
  y, -1.3
  pigment { color rgb <0.7,0.5,0.3> }
}

#declare ba=5.7;  //linksunten rechst oben   flach
#declare bb=7.3;  //linksoben rechtunten         //6 , 9 ,    , 15
#declare bc=5.5;    //links unten rechts oben   steil
#declare b1=max(ba,bb,bc)+2;

#declare s=sqrt(3)/2;        

    /*
//tube armchair
#declare bb=bb+6;  //6 , 9 ,    , 15
#declare r=(bb-6)/pi;
#macro ab2y(b,a) sin(a/r)*r  
#end
#macro ab2x(b,a)  b 
#end
#macro ab2z(b,a)  cos(a/r)*r  -r
#end
  */

   /*
//rim armchair
#declare r=(bb-6)/pi*3;
#macro ab2y(b,a) sin(a/r)*r   
#end
#macro ab2x(b,a)  b 
#end
#macro ab2z(b,a)  cos(a/r)*r  -r
#end
     */

/*  
//ribbon
#macro ab2x(a,b) a 
#end
#macro ab2y(a,b)  b 
#end
#macro ab2z(a,b)  0 
#end        
*/ 

#declare ha=0.92;
#declare hu=1.3;
#declare hr=sqrt(ha*ha+hu*hu);

    
//rim zizag
#declare r=1.68;//3.135;
#macro ab2x(a,b) sin((hu*a-ha*b)/hr/r)*r 
#end
#macro ab2y(a,b)  (ha*a+hu*b)/hr 
#end
#macro ab2z(a,b)  cos((hu*a-ha*b)/hr/r)*r -r
#end        
  

/*
//ribbon
#declare r=3;//1.68;//3.135;
#macro ab2x(a,b) ((hu*a-ha*b)/hr/r)*r 
#end
#macro ab2y(a,b)  (ha*a+hu*b)/hr 
#end
#macro ab2z(a,b)  0
#end        
*/

    /*   
//tube zizag
#declare ba=ba+2;
#declare r=(ba*s)/pi;
#macro ab2x(a,b) sin(a/r)*r 
#end
#macro ab2y(a,b)  b 
#end
#macro ab2z(a,b)  cos(a/r)*r  -r
#end

  */   

// m,n -> x,y
/*

  ****
 *    *
*      *
 *    *
  ****

*/

#macro kugel(m,n)
       #if ( (abs(m)<ba) & (abs(n)<bb) & (abs(m+n-0.5)<bc) )
// #if (abs(m+n)<ba)
                sphere{<ab2x(m+n/2,n*s),ab2y(m+n/2,n*s),ab2z(m+n/2,n*s)>,0.2}
   //    #end 
   #end        
#end

#macro zylinder(m,n,m1,n1)
       #if ( (abs(m)<ba) & (abs(n)<bb) & (abs(m+n-0.5)<bc) )
#if ( (abs(m1)<ba) & (abs(n1)<bb) & (abs(m1+n1-0.5)<bc) )
                cylinder{<ab2x(m+n/2,n*s),ab2y(m+n/2,n*s),ab2z(m+n/2,n*s)>,<ab2x(m1+n1/2,n1*s),ab2y(m1+n1/2,n1*s),ab2z(m1+n1/2,n1*s)>,0.17}
       #end 
   #end        
#end

union{   

#declare m = -b1;
#while (m <= b1)
#declare n = -b1;
#while (n <= b1)

kugel(m,n)
zylinder(m,n,m-1/3,n+2/3)
kugel(m-1/3,n+2/3)
zylinder(m-1/3,n+2/3,m-1,n+1)
zylinder(m-1/3,n+2/3,m,n+1)

#declare n = n+1;   // increment our counter
#end
#declare m = m+1;   // increment our counter
#end

         texture {
            pigment {
                color rgb <1,1,1>*0.7
            }
            finish{
              specular 0.6
            }
         }
     scale 0.2 //08 //2
   //  translate 0.4*z
     rotate <90,45,0>
     rotate <0,90,0>
     rotate <-20,0,0>
   //  translate z        
}

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