41 lines
1.4 KiB
C++
41 lines
1.4 KiB
C++
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#include "Lighting.h"
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#include <math.h> /* pow() */
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Color Lighting::computePhong(const Material & material,
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const std::vector<Light *> & lights,
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const Ray & viewRay,
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const Vector & surfacePoint,
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const Vector & surfaceNormal,
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const Color & ambientLight)
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{
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Color result = ambientLight;
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Vector viewDirection = -viewRay.getDirection();
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double shininess = material.getShininess();
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const Color & diffuseColor = material.getDiffuseColor();
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const Color & specularColor = material.getSpecularColor();
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for (std::vector<Light *>::const_iterator it = lights.begin();
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it != lights.end();
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it++)
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{
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Vector directionToLight = (*it)->getPosition() - surfacePoint;
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directionToLight.normalize();
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Vector reflectedLightDirection =
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directionToLight.reflect(surfaceNormal);
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/* calculate the diffuse term */
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result += diffuseColor
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* (*it)->getDiffuseColor()
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* (directionToLight % surfaceNormal);
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/* calculate the specular term */
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result += specularColor
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* (*it)->getSpecularColor()
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* pow(reflectedLightDirection % viewDirection, shininess);
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}
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return result;
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}
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