Add enviromental samples per pixel

camera.hpp

@@ -0,0 +1,36 @@
+#ifndef CAMERA_H
+#define CAMERA_H
+
+#include "rtweekend.hpp"
+
+struct camera {
+    /* Attributes */
+    point3 origin;
+    point3 lower_left_corner;
+    vec3 horizontal;
+    vec3 vertical;    
+    
+    /* Constructors */
+    camera()
+    {
+        double aspect_ratio = 16.0 / 9;
+        double viewport_height = 2.0;
+        double viewport_width = aspect_ratio * viewport_height;
+        double focal_length = 1.0;
+
+        origin = vec3(0,0,0);
+        horizontal = vec3(viewport_width, 0, 0);
+        vertical = vec3(0, viewport_height, 0);
+        lower_left_corner = origin - horizontal/2 - vertical/2 - vec3(0, 0, focal_length);        
+    }
+
+    /* Methods */    
+
+    ray get_ray(double u, double v) const
+    {
+        return ray(origin, lower_left_corner + u*horizontal + v*vertical - origin);
+    };
+       
+};
+
+#endif