/**
* Java Modular Image Synthesis Toolkit (JMIST)
* Copyright (C) 2008-2013 Bradley W. Kimmel
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
package ca.eandb.jmist.framework.material;
import ca.eandb.jmist.framework.Random;
import ca.eandb.jmist.framework.ScatteredRay;
import ca.eandb.jmist.framework.SurfacePoint;
import ca.eandb.jmist.framework.color.Color;
import ca.eandb.jmist.framework.color.ColorModel;
import ca.eandb.jmist.framework.color.Spectrum;
import ca.eandb.jmist.framework.color.WavelengthPacket;
import ca.eandb.jmist.framework.random.SimpleRandom;
import ca.eandb.jmist.framework.random.ThreadLocalRandom;
import ca.eandb.jmist.framework.scatter.SurfaceScatterer;
import ca.eandb.jmist.math.Point3;
import ca.eandb.jmist.math.Ray3;
import ca.eandb.jmist.math.Vector3;
/**
* A <code>Material</code> that adapts a <code>SurfaceScatterer</code> using a
* fixed wavelength.
*
* @author Brad Kimmel
*/
public final class MonochromaticSurfaceScattererMaterial extends
AbstractMaterial {
/** Serialization version ID. */
private static final long serialVersionUID = 2504834676929479253L;
private final SurfaceScatterer surface;
private final ColorModel colorModel;
private final Spectrum absorptionCoefficient;
private final double wavelength;
private final Random rnd = new ThreadLocalRandom(new SimpleRandom());
public MonochromaticSurfaceScattererMaterial(SurfaceScatterer surface,
ColorModel colorModel, Spectrum absorptionCoefficient,
double wavelength) {
this.surface = surface;
this.colorModel = colorModel;
this.absorptionCoefficient = absorptionCoefficient;
this.wavelength = wavelength;
}
/* (non-Javadoc)
* @see ca.eandb.jmist.framework.Medium#transmittance(ca.eandb.jmist.math.Ray3, double, ca.eandb.jmist.framework.color.WavelengthPacket)
*/
@Override
public Color transmittance(Ray3 ray, double distance,
WavelengthPacket lambda) {
return absorptionCoefficient != null
? absorptionCoefficient.sample(lambda).times(-distance).exp()
: lambda.getColorModel().getBlack(lambda);
}
/* (non-Javadoc)
* @see ca.eandb.jmist.framework.Medium#refractiveIndex(ca.eandb.jmist.math.Point3, ca.eandb.jmist.framework.color.WavelengthPacket)
*/
@Override
public Color refractiveIndex(Point3 p, WavelengthPacket lambda) {
return null;
}
/* (non-Javadoc)
* @see ca.eandb.jmist.framework.Medium#extinctionIndex(ca.eandb.jmist.math.Point3, ca.eandb.jmist.framework.color.WavelengthPacket)
*/
@Override
public Color extinctionIndex(Point3 p, WavelengthPacket lambda) {
return null;
}
@Override
public ScatteredRay scatter(SurfacePoint x, Vector3 v, boolean adjoint,
WavelengthPacket lambda, double ru, double rv, double rj) {
Vector3 r = surface.scatter(x, v, adjoint, wavelength, rnd);
if (r != null) {
Vector3 n = x.getNormal();
Point3 p = x.getPosition();
Ray3 ray = new Ray3(p, r);
Color color = colorModel.getWhite(lambda);
if (r.dot(n) > 0.0) {
return ScatteredRay.specular(ray, color, 0.0);
} else {
return ScatteredRay.transmitSpecular(ray, color, 0);
}
} else { // absorbed
return null;
}
}
}