camera.h

#ifndef __CAMERA_H__
#define __CAMERA_H__

#include "film.h"

class Camera
{
public:
    vec3 position; // camera position
    vec3 focal_point; // where the image plane is located
    vec3 look_vector; // points from the position to the focal point - normalized
    vec3 vertical_vector; // point up in the image plane - normalized
    vec3 horizontal_vector; // points to the right on the image plane - normalized
    Film film;

    Camera()
        :position(0,0,-1),focal_point(0,0,0),vertical_vector(0,1,0)
    {}

    void Position_And_Aim_Camera(const vec3& position_input,
        const vec3& look_at_point,const vec3& pseudo_up_vector);
    void Focus_Camera(double focal_distance,double aspect_ratio,
        double field_of_view);
    vec3 World_Position(const ivec2& pixel_index);
};
#endif