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/**
 * Copyright (c) 2008-2012 Ardor Labs, Inc.
 *
 * This file is part of Ardor3D.
 *
 * Ardor3D is free software: you can redistribute it and/or modify it 
 * under the terms of its license which may be found in the accompanying
 * LICENSE file or at .
 */

package com.ardor3d.math.functions;

/**
 * A variation of fBm that uses absolute value to recast the extreme ends to the upper range and values near 0 to the
 * lower range. This bunches together values into clusters that can resemble clouds or cotton balls.
 */
public class CloudsFunction3D extends FbmFunction3D {

    public static final int MAX_OCTAVES = 32;

    public CloudsFunction3D(final Function3D source, final int octaves, final double frequency,
            final double persistence, final double lacunarity) {
        super(source, octaves, frequency, persistence, lacunarity);
    }

    @Override
    protected double getValue(final double dx, final double dy, final double dz) {
        // Basically the "cloudy" |f(x)| you can find in perlin's docs and elsewhere, but rescaled to [-1, 1] to keep it
        // in the range used by most of our function.
        return 2.0 * Math.abs(getSource().eval(dx, dy, dz)) - 1.0;
    }
}