Midway hittable list inclusion

hittable.hpp

@@ -0,0 +1,25 @@
+#ifndef HITTABLE_H
+#define HITTABLE_H
+
+#include "ray.hpp"
+
+/* Representation of a hitpoint of a ray against a hittable object */
+struct hit_record {
+    point3 p;
+    vec3 normal;
+    double t;
+    bool front_face;
+
+    inline void set_face_normal(const ray& r, const vec3& outward_normal)
+    {
+        front_face = dot(r.direction, outward_normal) < 0;
+        normal = front_face ? outward_normal : -outward_normal;
+    }    
+};
+
+/* Virtual class that represents objects who could collide against a ray */
+struct hittable {
+    virtual bool hit(const ray& r, double t_min, double t_max, hit_record& rec) const = 0;
+};
+
+#endif