public float Value(float a)
{
var xOff = PMath.Map(PMath.Cos(a), -1, 1, CenterX, Diameter + CenterX);
var yOff = PMath.Map(PMath.Sin(a), -1, 1, CenterY, Diameter + CenterY);
SetNoiseType(NoiseType.PerlinFractal);
SetInterp(Interp.Quintic);
SetFractalType(FractalType.RigidMulti);
SetFractalLacunarity(3);
SetFrequency(0.1f);
var r = GetNoise(xOff, yOff);
return(PMath.Map(r, -0.5f, 0.5f, Min, Max));
}