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Mandelbox Julia with Spirals

(http://nocache-nocookies.digitalgott.com/gallery/19/999_09_01_17_1_12_17.jpeg)

http://www.fractalforums.com/index.php?action=gallery;sa=view;id=19927

 // Mandelbox Julia with fold at 0.5, scale = 1 and without y transformation.
// CenterX=5.50297045220822 CenterY=0.583399182382745
// CenterZ=2.10738023707053 Radius=0.214958267491292
public override bool GetBool(double x, double y, double z)
{
  for (int i = 0;i < 77;  i++)
  {
      while(Math.Abs(x)>0.5)
      {
        while(x>0.5)  x =  1-x;
        while(x<-0.5) x = -1-x;
      }
      while(Math.Abs(z)>0.5)
      {
        while(z>0.5)  z =  1-z;
        while(z<-0.5) z = -1-z;
      }
    double r=x*x+y*y+z*z;
    if(r>0)
    {
      x /= r;
      y /= r;
      z /= r;
      if(r<0.3) return false;
    }
    y=-y;
    x+= 0.02;
    y+= 1.9;
    z+= 0.5;
  }
  return true;
}