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diff --git a/hw6/src/recursiveRaytracing.cpp b/hw6/src/recursiveRaytracing.cpp
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+/******************************************************************/
+/* This file is part of the homework assignments for CSCI-427/527 */
+/* at The College of William & Mary and authored by Pieter Peers. */
+/* No part of this file, whether altered or in original form, can */
+/* be distributed or used outside the context of CSCI-427/527     */
+/* without consent of either the College of William & Mary or     */
+/* Pieter Peers.                                                  */
+/******************************************************************/
+#include "ray_util.h"
+#include "random_number.h"
+#include "recursiveRaytracing.h"
+
+
+//////////////////
+// Constructors //
+//////////////////
+recursiveRaytracing::recursiveRaytracing(unsigned int maxDepth, unsigned int samplesPerPixel)
+{
+  _depth = maxDepth;
+  _samples = samplesPerPixel;
+}
+
+ 
+/////////////
+// Methods //
+/////////////
+image recursiveRaytracing::render(const scene& s) const
+{
+  image result(s.getCamera().width(), s.getCamera().height());
+
+  // for every pixel
+  for(image::size_type y=0; y < result.height(); y++)
+    for(image::size_type x=0; x < result.width(); x++)
+    {
+      // for every sample per pixel
+      for(unsigned int sample = 0; sample < _samples; sample++)
+      {
+	// select point in pixel
+	float px = (_samples == 1) ? (float)(x) + 0.5f : (float)(x) + random_float();
+	float py = (_samples == 1) ? (float)(y) + 0.5f : (float)(y) + random_float();
+
+	// generate view ray
+	ray r = s.getCamera()(px,py);
+
+	// recursive ray tracing
+	result(x,y) += traceRay(s, r, 1) / (float)(_samples);
+      }
+    }
+  
+
+  // Done.
+  return result;
+}
+
+
+
+color recursiveRaytracing::traceRay(const scene& s, const ray& r, unsigned int currentDepth) const
+{
+  // intersect
+  intersectionPoint ip = s.intersect(r);
+
+  // if hit
+  color result;
+  if(ip.isHit())
+  {
+    // shade point
+    for(unsigned int l=0; l < s.numberOfLightsources(); l++)
+    {
+      // connect to light source
+      lightSample ls = s.getLightsource(l).intensityAt(ip.position());
+
+      // check if occluded
+      ray shadowRay = createRay(ip, ls.directionToLight());
+      intersectionPoint shadowIp = s.intersect(shadowRay);
+      if(ls < shadowIp)
+	result += ip.shade(ls);
+    }
+
+    // recurse
+    if(currentDepth < _depth && ip.getShaderProperties().specular)
+    {
+      ray reflectedRay = reflectRay(ip);
+      result += ip.shade(reflectedRay.direction()) * traceRay(s, reflectedRay, currentDepth+1);
+    }
+
+  }
+
+  // if not hit, check for environment map
+  else if(s.hasEnvironmentMap())
+    result += s.evaluateEnvironmentMap(r.direction());
+
+  // Done.
+  return result;
+}