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//
// Created by Keuin on 2022/4/11.
//
#ifndef RT_RAY_H
#define RT_RAY_H
#include "vec.h"
// A ray is a half-line, starts from a 3d point, along the direction of a unit vector, to the infinity
template<typename T>
class ray3 {
const vec3<T> source_;
const vec3<T> direction_; // unit vector
public:
ray3() = delete;
ray3(const vec3<T> &source, const vec3<T> &direction) : source_(source), direction_(direction.unit_vec()) {}
// Get the source point from where the ray emits.
vec3<T> source() const {
return source_;
}
// Get the unit vector along the ray's direction.
vec3<T> direction() const {
return direction_;
}
// Compute the point this ray reaches at the time `t`.
template<typename U>
vec3<T> at(U t) const {
return source_ + direction_ * t;
}
};
using ray3d = ray3<double>;
#endif //RT_RAY_H
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