31 lines
No EOL
1.1 KiB
C++
31 lines
No EOL
1.1 KiB
C++
#include "sunlight.h"
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SunLight::SunLight(Vector3d const &direction, float intensity, Color const &color) : Light(intensity, color),
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direction(normalized(direction))
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{}
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Light::Illumination SunLight::illuminate(Scene const &scene, Ray const &ray) const
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{
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Vector3d const target = ray.origin + (ray.length - LGT_EPS) * ray.direction;
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// Illumination object
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Illumination illum;
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illum.direction = this->direction;
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// Define a secondary ray from the surface point to the light source.
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Ray lightRay;
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lightRay.origin = target;
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lightRay.direction = -illum.direction;
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lightRay.length = INFINITY;
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// If the target is not in shadow...
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if (!scene.findOcclusion(lightRay))
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{
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// Look at angleIntensity of light
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float angleIntensity = dotProduct(-ray.normal,
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this->direction); // 0 if light is behind surface, 1 if light is in front of surface
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illum.color = this->color * this->intensity * angleIntensity;
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}
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return illum;
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} |