init commit

src/ray.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "vec3.h"
+
+class Ray {
+   public:
+    Ray() = default;
+
+    Ray(const Point3& origin, const Vec3& direction) : orig_{origin}, dir_{direction} {}
+
+    Point3 origin() const { return orig_; }
+    Vec3 direction() const { return dir_; }
+
+    Point3 At(double t) { return orig_ + t * dir_; }
+
+   private:
+    Point3 orig_;
+    Vec3 dir_;
+};