Default and copy constructors for Perspective and Orthographic cameras

src/camera.cc

@@ -74,6 +74,16 @@ Camera::SetUp(const Vector3& up)
 
 #pragma mark - Perspective Camera
 
+PerspectiveCamera::PerspectiveCamera()
+    : Camera()
+{ }
+
+
+PerspectiveCamera::PerspectiveCamera(const Camera& other)
+    : Camera(other)
+{ }
+
+
 Ray
 PerspectiveCamera::compute_primary_ray(const int x,
                                        const int width,
@@ -96,6 +106,16 @@ PerspectiveCamera::compute_primary_ray(const int x,
 
 #pragma mark - Orthographic Camera
 
+OrthographicCamera::OrthographicCamera()
+    : Camera()
+{ }
+
+
+OrthographicCamera::OrthographicCamera(const Camera& other)
+    : Camera(other)
+{ }
+
+
 /*
  * OrthographicCamera::compute_primary_ray --
  */

src/camera.h

@@ -55,6 +55,10 @@ private:
 class PerspectiveCamera
     : public Camera
 {
+public:
+    PerspectiveCamera();
+    PerspectiveCamera(const Camera& other);
+
     Ray compute_primary_ray(const int x, const int width,
                             const int y, const int height) const;
 };
@@ -64,6 +68,9 @@ class OrthographicCamera
     : public Camera
 {
 public:
+    OrthographicCamera();
+    OrthographicCamera(const Camera& other);
+
     Ray compute_primary_ray(const int x, const int width,
                             const int y, const int height) const;
 };