function TPerlinNoise.PerlinNoise_2D(x, y: single): single;
var
  total, amplitude, a: single;
  frequency, i: integer;
begin
  total:= 0;
  amplitude:= FTiefe1Ampl;
  frequency:= 1;
  for i:= 1 to FOctaves do begin
    a:= InterpolatedNoise_1(x * frequency, y * frequency);
    total:= total + a * amplitude;
    frequency:= frequency * 2;
    amplitude:= amplitude * FPersistence;
  end;
  Result:= total + FOffset;
end;

procedure TPerlinNoise.InitGenerator(Persistence: single; Octaves: integer; Min, Max: single);
var
  Bereich, total, amplitude: single;
  i: integer;
begin
  FPersistence:= Persistence;
  FOctaves:= Octaves;
  FSeed:= 0;

  Bereich:= Max - Min;
  FOffset:= Min + Bereich * 0.5;
  total:= 0;
  amplitude:= 1;
  for i:= 1 to FOctaves do begin
    total:= total + amplitude;
    amplitude:= amplitude * FPersistence;
  end;
  FTiefe1Ampl:= Bereich / total;
  FMaxValue:= total;
  FRange:= Bereich;
end;