public override double GetValue(double x, double y) { double value = 0.0; double signal = 0.0; double curPersistence = 1.0; //double nx, ny, nz; long seed; double lacunarity = Lacunarity.GetValue(x, y); double persistence = Persistence.GetValue(x, y); double frequency = Frequency.GetValue(x, y); x *= frequency; y *= frequency; int mOctaveCount = (int)OctaveCount.GetValue(x, y); for (int currentOctave = 0; currentOctave < mOctaveCount; currentOctave++) { seed = (Seed + currentOctave) & 0xffffffff; signal = GradientNoise.GradientCoherentNoise(x, y, (int)seed, NoiseQuality); value += signal * curPersistence; x *= lacunarity; y *= lacunarity; curPersistence *= persistence; } return(value); }
public override double GetValue(double x, double y, double z) { double lacunarity = Lacunarity.GetValue(x, y, z); double gain = Gain.GetValue(x, y, z); double offset = Offset.GetValue(x, y, z); double frequency = Frequency.GetValue(x, y, z); x *= frequency; y *= frequency; z *= frequency; int mOctaveCount = (int)OctaveCount.GetValue(x, y, z); double signal = 0.0; double value = 0.0; double weight = 1.0; for (int currentOctave = 0; currentOctave < mOctaveCount; currentOctave++) { long seed = (Seed + currentOctave) & 0x7fffffff; signal = GradientNoise.GradientCoherentNoise(x, y, z, (int)seed, NoiseQuality); // Make the ridges. signal = System.Math.Abs(signal); signal = offset - signal; // Square the signal to increase the sharpness of the ridges. signal *= signal; // The weighting from the previous octave is applied to the signal. // Larger values have higher weights, producing sharp points along the // ridges. signal *= weight; // Weight successive contributions by the previous signal. weight = signal * gain; if (weight > 1.0) { weight = 1.0; } else if (weight < 0.0) { weight = 0.0; } // Add the signal to the output value. value += (signal * SpectralWeights[currentOctave]); // Go to the next octave. x *= lacunarity; y *= lacunarity; z *= lacunarity; } return((value * 1.25) - 1.0); }
public override double GetValue(double x, double y, double z) { double value = 0.0; double signal = 0.0; double curPersistence = 1.0; //double nx, ny, nz; long seed; double lacunarity = Lacunarity.GetValue(x, y, z); double persist = Persistence.GetValue(x, y, z); double frequency = Frequency.GetValue(x, y, z); x *= frequency; y *= frequency; z *= frequency; int mOctaveCount = (int)OctaveCount.GetValue(x, y, z); for (int currentOctave = 0; currentOctave < mOctaveCount; currentOctave++) { /*nx = Math.MakeInt32Range(x); * ny = Math.MakeInt32Range(y); * nz = Math.MakeInt32Range(z);*/ seed = (Seed + currentOctave) & 0xffffffff; signal = GradientNoise.GradientCoherentNoise(x, y, z, (int)seed, NoiseQuality); signal = 2.0 * System.Math.Abs(signal) - 1.0; value += signal * curPersistence; x *= lacunarity; y *= lacunarity; z *= lacunarity; curPersistence *= persist; } value += 0.5; return(value); }