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Inverted Menger Sponge

(http://nocache-nocookies.digitalgott.com/gallery/19/999_18_12_16_9_15_15.jpeg)

http://www.fractalforums.com/index.php?action=gallery;sa=view;id=19863

// Please remove this after pressing the box above two times. This sets the position.
public override void Init(){base.Init();if(GetString("intern.Formula.TempUpdateVal")!="43454d7d68fddcf192143262682d933f"){SetParameterBulk("Scene: CenterX=0.0943303508326203 CenterY=0.63668925376446 CenterZ=-0.100730183001073 Radius=0.11667506936911 Transformation.Camera: AngleX=-21.432389015681 AngleY=2.50643728825066 AngleZ=-15.6335199621586 IsometricProjection=1 Position=1 View: DephAdd=250");}}
 
 
public override bool GetBool(double x,double y,double z)
{
  double boxSize=2.9;
  double holeSize=1.1;
  double scale=2.2;
  for (int n=1;n < 14;  n++)
  {
    if(Math.Abs(x)>=holeSize &&
    Math.Abs(y)>=holeSize &&
    Math.Abs(z)>=holeSize) return false;
    if(x> holeSize) x-=scale*holeSize;
    if(x<-holeSize) x+=scale*holeSize;
    if(y> holeSize) y-=scale*holeSize;
    if(y<-holeSize) y+=scale*holeSize;
    if(z> holeSize) z-=scale*holeSize;
    if(z<-holeSize) z+=scale*holeSize;
    x*=boxSize;
    y*=boxSize;
    z*=boxSize;
  }
  return true;
}