#include "colors.inc"

// Change these to control differenct aspects of the spring...
#declare Ang=10;   //angle that half a section of spring goes down
#declare MinorR=0.1;  //thickness of spring section
#declare MajorR=2;



// Leave these alone or you'll only give yourself a headache...
#declare Ydiff=-2*MajorR*sin(radians(Ang));
#declare Xdiff=-2*MajorR*cos(radians(Ang));


camera {
  location <-1,3,-9>
  look_at <0,5*Ydiff,0>
}

light_source {
  <1,5,-7>
  color White
}

#declare SpringPiece=
union {
  difference {
    torus {
      MajorR,MinorR
    }
    box {
      <-(MajorR+MinorR)*1.1,-1,-(MajorR+MinorR)*1.1>,<(MajorR+MinorR)*1.1,1,0>
    }
    translate x*-MajorR
    rotate Ang*z
  }
  difference {
    torus {
      MajorR,MinorR
    }
    box {
      <-(MajorR+MinorR)*1.1,-1,-(MajorR+MinorR)*1.1>,<(MajorR+MinorR)*1.1,1,0>
    }
    translate x*-MajorR
    rotate 180*y
    rotate -Ang*z
    translate <Xdiff,Ydiff,0>
  }
  translate x*MajorR
}

union {
  object {SpringPiece}
  object {SpringPiece translate 2*y*Ydiff}
  object {SpringPiece translate 4*y*Ydiff}
  object {SpringPiece translate 6*y*Ydiff}
  object {SpringPiece translate 8*y*Ydiff}
  pigment {color Yellow}
}