Add hittable interface and hit infos on hit

1 files changed, 23 insertions, 0 deletions

diff --git a/include/hittable.hpp b/include/hittable.hpp
new file mode 100644
index 0000000..4978e57
--- /dev/null
+++ b/include/hittable.hpp
@@ -0,0 +1,23 @@
+#ifndef __HITTABLE_HPP_
+#define __HITTABLE_HPP_
+
+#include "ray.hpp"
+
+struct hit_info {
+    double t;
+    point3 point;
+    vec3 normal;
+    bool front_face;
+
+    inline void set_face_normal(const ray& r, const vec3& outward_normal) {
+        front_face = r.direction.dot(outward_normal) < 0.0;
+        normal = front_face ? outward_normal : -outward_normal;
+    }
+};
+
+class hittable {
+    public:
+        virtual bool hit(const ray& r, double t_min, double t_max, struct hit_info& info) const = 0;
+};
+
+#endif // !__HITTABLE_HPP_