Smooth triangles! And support for them in the OBJ File parser.

Also add an interesting tea party scene!

source/include/smoothtriangle.h

@@ -0,0 +1,28 @@
+/*
+ *  DoRayMe - a quick and dirty Raytracer
+ *  Smooth Triangle header
+ *
+ *  Created by Manoël Trapier
+ *  Copyright (c) 2020 986-Studio.
+ *
+ */
+#ifndef DORAYME_SMOOTHTRIANGLE_H
+#define DORAYME_SMOOTHTRIANGLE_H
+
+#include <triangle.h>
+
+class SmoothTriangle : public Triangle
+{
+public:
+    Vector n1;
+    Vector n2;
+    Vector n3;
+
+protected:
+    Tuple localNormalAt(Tuple point, Intersection *hit);
+
+public:
+    SmoothTriangle(Point p1, Point p2, Point p3, Vector n1, Vector n2, Vector n3);
+};
+
+#endif /* DORAYME_SMOOTHTRIANGLE_H */