27 lines
998 B
C++
27 lines
998 B
C++
#include "light/pointlight.h"
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#include "scene/scene.h"
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PointLight::PointLight(Vector3d const &position, float intensity, Color const &color) : Light(intensity, color), position(position) {}
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Light::Illumination PointLight::illuminate(Scene const &scene, Ray const &ray) const {
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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 = normalized(target - this->position);
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// Precompute the distance from the light source
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float const distance = length(target - this->position);
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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 = distance - LGT_EPS;
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// If the target is not in shadow...
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if (!scene.findOcclusion(lightRay))
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// ... compute the attenuation and light color
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illum.color = 1.0f / (distance * distance) * this->color * this->intensity;
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return illum;
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}
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