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/*
* Copyright (C) 2003, 2004 Jason Bevins (original libnoise code)
* Copyright 2010 Thomas J. Hodge (java port of libnoise)
*
* This file is part of libnoiseforjava.
*
* libnoiseforjava is a Java port of the C++ library libnoise, which may be found at
* http://libnoise.sourceforge.net/. libnoise was developed by Jason Bevins, who may be
* contacted at jlbezigvins@gmzigail.com (for great email, take off every 'zig').
* Porting to Java was done by Thomas Hodge, who may be contacted at
* libnoisezagforjava@gzagmail.com (remove every 'zag').
*
* libnoiseforjava is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* libnoiseforjava is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* libnoiseforjava. If not, see <http://www.gnu.org/licenses/>.
*
*/
package libnoiseforjava.module;
import libnoiseforjava.NoiseGen;
import libnoiseforjava.NoiseGen.NoiseQuality;
public class Billow extends ModuleBase
{
/// Noise module that outputs three-dimensional "billowy" noise.
///
/// @image html modulebillow.png
///
/// This noise module generates "billowy" noise suitable for clouds and
/// rocks.
///
/// This noise module is nearly identical to noise::module::Perlin except
/// this noise module modifies each octave with an absolute-value
/// function. See the documentation of noise::module::Perlin for more
/// information.
/// Default frequency for the Billow noise module.
static final double DEFAULT_BILLOW_FREQUENCY = 1.0;
/// Default lacunarity for the Billow noise module.
static final double DEFAULT_BILLOW_LACUNARITY = 2.0;
/// Default number of octaves for the the noise::module::Billow noise
/// module.
static final int DEFAULT_BILLOW_OCTAVE_COUNT = 6;
/// Default persistence value for the the noise::module::Billow noise
/// module.
static final double DEFAULT_BILLOW_PERSISTENCE = 0.5;
/// Default noise quality for the the noise::module::Billow noise module.
static final NoiseQuality DEFAULT_BILLOW_QUALITY = NoiseQuality.QUALITY_STD;
/// Default noise seed for the the noise::module::Billow noise module.
static final int DEFAULT_BILLOW_SEED = 0;
/// Maximum number of octaves for the the noise::module::Billow noise
/// module.
static final int BILLOW_MAX_OCTAVE = 30;
double frequency, lacunarity, persistence;
int octaveCount, seed;
NoiseQuality noiseQuality;
public Billow ()
{
super(0);
frequency = DEFAULT_BILLOW_FREQUENCY;
lacunarity = DEFAULT_BILLOW_LACUNARITY;
noiseQuality = DEFAULT_BILLOW_QUALITY;
octaveCount = DEFAULT_BILLOW_OCTAVE_COUNT;
persistence = DEFAULT_BILLOW_PERSISTENCE;
seed = DEFAULT_BILLOW_SEED;
}
public double getValue (double x, double y, double z)
{
double value = 0.0;
double signal = 0.0;
double curPersistence = 1.0;
double nx, ny, nz;
int calcSeed;
x *= frequency;
y *= frequency;
z *= frequency;
for (int curOctave = 0; curOctave < octaveCount; curOctave++)
{
// Make sure that these floating-point values have the same range as a 32-
// bit integer so that we can pass them to the coherent-noise functions.
nx = NoiseGen.MakeInt32Range (x);
ny = NoiseGen.MakeInt32Range (y);
nz = NoiseGen.MakeInt32Range (z);
// Get the coherent-noise value from the input value and add it to the
// final result.
calcSeed = (seed + curOctave) & 0xffffffff;
signal = NoiseGen.GradientCoherentNoise3D (nx, ny, nz, calcSeed, noiseQuality);
signal = 2.0 * Math.abs(signal) - 1.0;
value += signal * curPersistence;
// Prepare the next octave.
x *= lacunarity;
y *= lacunarity;
z *= lacunarity;
curPersistence *= persistence;
}
value += 0.5;
return value;
}
public double getFrequency()
{
return frequency;
}
public double getLacunarity()
{
return lacunarity;
}
public double getPersistence()
{
return persistence;
}
public int getOctaveCount()
{
return octaveCount;
}
public int getSeed()
{
return seed;
}
public NoiseQuality getNoiseQuality()
{
return noiseQuality;
}
public void setFrequency(double frequency)
{
this.frequency = frequency;
}
public void setLacunarity(double lacunarity)
{
this.lacunarity = lacunarity;
}
public void setPersistence(double persistence)
{
this.persistence = persistence;
}
public void setOctaveCount(int octaveCount)
{
this.octaveCount = octaveCount;
}
public void setSeed(int seed)
{
this.seed = seed;
}
public void setNoiseQuality(NoiseQuality noiseQuality)
{
this.noiseQuality = noiseQuality;
}
}
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