Log the camera before rendering

Implement an operator<< for Cameras. Log the scene's camera.

src/camera.cc

@@ -123,6 +123,14 @@ Camera::LookAt(const Vector3& pt)
     mUp *= upLength;
 }
 
+
+void
+Camera::WriteType(std::ostream& ost)
+    const
+{
+    ost << "UNKNOWN";
+}
+
 #pragma mark - Perspective Camera
 
 PerspectiveCamera::PerspectiveCamera()
@@ -155,6 +163,14 @@ PerspectiveCamera::compute_primary_ray(const int x,
     return Ray(GetOrigin(), direction.normalize());
 }
 
+
+void
+PerspectiveCamera::WriteType(std::ostream& ost)
+    const
+{
+    ost << "perspective";
+}
+
 #pragma mark - Orthographic Camera
 
 OrthographicCamera::OrthographicCamera()
@@ -195,3 +211,26 @@ OrthographicCamera::compute_primary_ray(const int x,
                                        y0, GetUp());
     return Ray(origin, get_direction());
 }
+
+
+void
+OrthographicCamera::WriteType(std::ostream& ost)
+    const
+{
+    ost << "orthographic";
+}
+
+
+std::ostream&
+operator<<(std::ostream& ost,
+           const Camera& camera)
+{
+    ost << "[Camera ";
+    camera.WriteType(ost);
+    ost << " origin=" << camera.mOrigin
+        << " direction=" << camera.mDirection
+        << " right=" << camera.mRight
+        << " up=" << camera.mUp
+        << "]";
+    return ost;
+}

src/camera.h

@@ -66,6 +66,10 @@ private:
      * this and mRight determine the aspect ratio of the image.
      */
     Vector3 mUp;
+
+    virtual void WriteType(std::ostream& ost) const;
+
+    friend std::ostream& operator<<(std::ostream& ost, const Camera& camera);
 };
 
 
@@ -78,6 +82,9 @@ public:
 
     Ray compute_primary_ray(const int x, const int width,
                             const int y, const int height) const;
+
+private:
+    void WriteType(std::ostream& ost) const;
 };
 
 
@@ -90,7 +97,12 @@ public:
 
     Ray compute_primary_ray(const int x, const int width,
                             const int y, const int height) const;
+
+private:
+    void WriteType(std::ostream& ost) const;
 };
 
 
+std::ostream& operator<<(std::ostream& ost, const Camera& camera);
+
 #endif

src/scene.cc

@@ -150,7 +150,9 @@ Scene::render()
 {
     LOG_INFO << "Rendering scene with " << shapes.size() << " objects.";
     printf("Rendering scene with %lu objects.\n", shapes.size());
+
     LogObjects();
+    LogCamera();
 
     std::chrono::time_point<std::chrono::system_clock> start, end;
     start = std::chrono::system_clock::now();
@@ -330,6 +332,14 @@ Scene::trace_ray(const Ray &ray,
 }
 
 
+void
+Scene::LogCamera()
+    const
+{
+    LOG_DEBUG << *mCamera;
+}
+
+
 void
 Scene::LogObjects()
     const

src/scene.h

@@ -53,6 +53,7 @@ public:
 private:
     Color trace_ray(const Ray &ray, const int depth = 0, const float weight = 1.0);
 
+    void LogCamera() const;
     void LogObjects() const;
 
     // Pixel dimensions of the image.