public override double this[double x, double y, double z] {
get {
double val = 0.0;
double signal = 0.0;
double persistance = 1.0;
double nx, ny, nz;
int seed;
x *= Frequency;
y *= Frequency;
z *= Frequency;
for (int octave = 0; octave < Octaves; ++octave)
{
nx = Noise.MakeIntRange(x);
ny = Noise.MakeIntRange(y);
nz = Noise.MakeIntRange(z);
seed = (int)((Seed + octave) & 0xffffffff);
signal = Noise.CoherentGradientNoise3D(nx, ny, nz, seed, Quality);
val += signal * persistance;
x *= Lacunarity;
y *= Lacunarity;
z *= Lacunarity;
persistance *= Persistance;
}
return(val);
}
}
public override double this[double x, double y, double z] {
get {
x *= Frequency;
y *= Frequency;
z *= Frequency;
double signal = 0.0;
double val = 0.0;
double weight = 1.0;
double offset = 1.0;
double gain = 2.0;
double[] weights = SpectralWeights;
for (int octave = 0; octave < Octaves; ++octave)
{
double nx = Noise.MakeIntRange(x);
double ny = Noise.MakeIntRange(y);
double nz = Noise.MakeIntRange(z);
int seed = (Seed + octave) & 0x7fffffff;
signal = Noise.CoherentGradientNoise3D(nx, ny, nz, seed, Quality);
signal = System.Math.Abs(signal);
signal = offset - signal;
signal *= signal;
signal *= weight;
weight = signal * gain;
if (weight > 1.0)
{
weight = 1.0;
}
if (weight < 0.0)
{
weight = 0.0;
}
val += (signal * weights[octave]);
x *= Lacunarity;
y *= Lacunarity;
z *= Lacunarity;
}
return((val * 1.25) - 1.0);
}
}
