/* Copyright (C) 2011 Garrett Fleenor
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3.0 of the License, or (at
your option) any later version.
This library 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 Lesser General Public
License (COPYING.txt) for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
This is a port of libnoise ( http://libnoise.sourceforge.net/index.html ). Original implementation by Jason Bevins
*/
package com.bioxx.libnoise.module.source;
import com.bioxx.libnoise.MathHelper;
import com.bioxx.libnoise.Utils;
import com.bioxx.libnoise.module.Module;
public class Spheres extends Module {
/// Default frequency value for the noise::module::Spheres noise module.
public static final double DEFAULT_SPHERES_FREQUENCY = 1.0;
/// Frequency of the concentric spheres.
double frequency = DEFAULT_SPHERES_FREQUENCY;
public Spheres() {
super(0);
}
public double getFrequency() {
return frequency;
}
public void setFrequency(double frequency) {
this.frequency = frequency;
}
@Override
public int GetSourceModuleCount() {
return 0;
}
@Override
public double GetValue(double x, double y, double z) {
double x1 = x;
double y1 = y;
double z1 = z;
x1 *= frequency;
y1 *= frequency;
z1 *= frequency;
double distFromCenter = MathHelper.sqrt(x1 * x1 + y1 * y1 + z1 * z1);
double distFromSmallerSphere = distFromCenter - MathHelper.floor(distFromCenter);
double distFromLargerSphere = 1.0 - distFromSmallerSphere;
double nearestDist = Utils.GetMin(distFromSmallerSphere, distFromLargerSphere);
return 1.0 - (nearestDist * 4.0); // Puts it in the -1.0 to +1.0 range.
}
}