//
// Created by marcel on 21.11.22.
//

#include "light/ambientlight.h"
#include "scene/scene.h"

AmbientLight::AmbientLight(float intensity, const Color &color) : Light(intensity, color) {}

Light::Illumination AmbientLight::illuminate(Scene const &scene, Ray const &ray) const {
    Vector3d const target = ray.origin + (ray.length - LGT_EPS) * ray.direction;

    Illumination illum;
    illum.direction = -ray.normal;

    // Precompute the distance from the light source
    float const distance = length(ray.normal);


    // Define a secondary ray from the surface point to the light source.
    Ray lightRay;
    lightRay.origin = target;
    lightRay.direction = -illum.direction;
    lightRay.length = distance - LGT_EPS;

    // If the target is not in shadow...
    if (!scene.findOcclusion(lightRay))
        // ... compute the attenuation and light color
        illum.color = 1.0f / (distance * distance) * this->color * this->intensity;
    return illum;
    return illum;
}