public double GetValue(double x, double y)
{
double value = 0.0;
double signal = 0.0;
double curPersistence = 1.0;
x *= _frequency; y *= _frequency;
for (int currentOctave = 0; currentOctave < Octaves; currentOctave++)
{
signal = _noise.Noise2D(x, y);
value += signal * curPersistence;
x *= Lacunarity; y *= Lacunarity;
curPersistence *= Persistence;
}
return(value * Amplitude);
}
public double GetValue(double x, double y)
{
x *= _frequency; y *= _frequency;
double signal = 0.0;
double value = 0.0;
double weight = 1.0;
double offset = 1.0;
double gain = 2.0;
for (int currentOctave = 0; currentOctave < Octaves; currentOctave++)
{
signal = _noise.Noise2D(x, y);
// Make the ridges.
signal = Math.Abs(signal);
signal = offset - signal;
// Square the signal to increase the sharpness of the ridges.
signal *= signal; signal *= weight;
// Weight successive contributions by the previous signal.
weight = signal * gain;
if (weight > 1.0)
{
weight = 1.0;
}
if (weight < 0.0)
{
weight = 0.0;
}
// Add the signal to the output value.
value += (signal * _spectralWeight[currentOctave]);
// Go to the next octave.
x *= _lacunarity; y *= _lacunarity;
}
return(((value * 1.25) - 1.0) * _amplitude);
}