diff --git a/src/Parser.cc b/src/Parser.cc
index 126c6b3..fb9fc21 100644
--- a/src/Parser.cc
+++ b/src/Parser.cc
@@ -40,6 +40,8 @@ Scene *Parser::getScene(const nlohmann::json &j) {
   sc->setAntialiasing(j.value("antialiasing", false));
   sc->setTwoSideRender(j.value("twosiderender", false));
   sc->setGlobalIllum(j.value("globalillum", false));
+  sc->setMaxBounce(j.value("maxbounce", 3));
+  sc->setProbTerminate(j.value("probTerminate", 0.33f));
   if (j.contains("raysperpixel"))
     sc->setRaysPerPixel(getRpp(j["raysperpixel"]));
 
diff --git a/src/RayTracer.cc b/src/RayTracer.cc
index 3437b69..3d0e669 100644
--- a/src/RayTracer.cc
+++ b/src/RayTracer.cc
@@ -17,7 +17,7 @@ using std::priority_queue;
 Ray getRay(int, int);
 Ray getRay(int, int, int, int);
 void writeColor(int, const Vector3f &);
-Vector3f trace(Ray r);
+utils::Optional<Vector3f> trace(Ray r);
 Vector3f clamp(const Vector3f &);
 
 namespace camera {
@@ -88,7 +88,11 @@ void RayTracer::render() {
         for (int j = 0; j < gridHeight; ++j)
           for (int i = 0; i < gridWidth; ++i) {
             Ray ray = getRay(x, y, i, j);
-            accumulate += trace(ray);
+            utils::Optional<Vector3f> result = trace(ray);
+            if (result.hasValue()) {
+              accumulate += result.value() * raysPerPixel;
+              success += raysPerPixel;
+            }
           }
         if (!success)
           color = accumulate / success;
@@ -146,7 +150,13 @@ void writeColor(int i, const Vector3f &color) {
   Output::current->b(i, color.z());
 }
 
-Vector3f trace(Ray r) { return Vector3f::Zero(); }
+Vector3f trace(Ray r, int bounce, float prob) {}
+
+utils::Optional<Vector3f> trace(Ray r) {
+  Vector3f color =
+      trace(r, Scene::current->maxBounce(), Scene::current->probTerminate());
+  return utils::Optional<Vector3f>::nullopt;
+}
 
 namespace camera {
 int getGridWidth(VectorXi data) {
diff --git a/src/Scene.cc b/src/Scene.cc
index 7c78821..12c3e27 100644
--- a/src/Scene.cc
+++ b/src/Scene.cc
@@ -12,6 +12,10 @@ float Scene::fov() { return fov_; }
 
 bool Scene::globalIllum() { return globalIllum_; }
 
+int Scene::maxBounce() { return maxBounce_; }
+
+float Scene::probTerminate() { return probTerminate_; }
+
 Eigen::VectorXi Scene::raysPerPixel() const { return raysPerPixel_; }
 
 Vector3f Scene::ai() const { return ai_; }
@@ -39,3 +43,9 @@ void Scene::setTwoSideRender(bool twoSideRender) {
 void Scene::setGlobalIllum(bool globalIllum) {
   this->globalIllum_ = globalIllum;
 }
+
+void Scene::setMaxBounce(int maxBounce) { this->maxBounce_ = maxBounce; }
+
+void Scene::setProbTerminate(float probTerminate) {
+  this->probTerminate_ = probTerminate;
+}
diff --git a/src/Scene.h b/src/Scene.h
index 9cc9f5d..fe033da 100644
--- a/src/Scene.h
+++ b/src/Scene.h
@@ -30,6 +30,8 @@ private:
   bool antialiasing_ = false;
   bool twoSideRender_ = false;
   bool globalIllum_ = false;
+  int maxBounce_ = 3;
+  float probTerminate_ = 0.33;
 
 public:
   static Scene *current;
@@ -39,6 +41,8 @@ public:
   int height();
   float fov();
   bool globalIllum();
+  int maxBounce();
+  float probTerminate();
   Vector3f ai() const;
   Vector3f center() const;
   Vector3f up() const;
@@ -49,6 +53,8 @@ public:
   void setAntialiasing(bool);
   void setTwoSideRender(bool);
   void setGlobalIllum(bool);
+  void setMaxBounce(int);
+  void setProbTerminate(float);
 };
 
 #endif // !SCENE_H_