Added presentations from EVI 2017

EVI - 2017/EVI 21/EVIray/whitted_tracer.hpp

@@ -0,0 +1,18 @@
+#pragma once
+#ifndef WHITTED_TRACER_HPP
+#define WHITTED_TRACER_HPP
+
+#include "tracer.hpp"
+
+class WhittedTracer: public Tracer {
+public:
+  WhittedTracer(): Tracer() { }
+
+  WhittedTracer(unsigned int max_depth): Tracer(max_depth) { };
+
+  virtual ~WhittedTracer();
+
+  virtual vec3 trace_ray(Ray & r, Scene * s, unsigned int rec_level) const;
+};
+
+#endif