/**
* 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.shader;
import ca.eandb.jmist.framework.LightSample;
import ca.eandb.jmist.framework.Material;
import ca.eandb.jmist.framework.Shader;
import ca.eandb.jmist.framework.ShadingContext;
import ca.eandb.jmist.framework.color.Color;
import ca.eandb.jmist.framework.color.WavelengthPacket;
import ca.eandb.jmist.math.Vector3;
/**
* @author brad
*
*/
public final class DirectLightingShader implements Shader {
/**
* Serialization version ID.
*/
private static final long serialVersionUID = -7391459165157437122L;
/* (non-Javadoc)
* @see ca.eandb.jmist.framework.Shader#shade(ca.eandb.jmist.framework.ShadingContext)
*/
public Color shade(ShadingContext sc) {
Material mat = sc.getMaterial();
WavelengthPacket lambda = sc.getWavelengthPacket();
Vector3 normal = sc.getShadingNormal();
Color sum = sc.getColorModel().getBlack(lambda);
for (LightSample sample : sc.getLightSamples()) {
if (!sample.castShadowRay(sc)) {
Vector3 in = sample.getDirToLight().opposite();
Vector3 out = sc.getIncident().opposite();
Color bsdf = mat.bsdf(sc, in, out, lambda);
double dot = Math.abs(in.dot(normal));
sum = sum.plus(sample.getRadiantIntensity().times(bsdf.times(dot)));
}
}
return sum;
}
}