Actually have matrixed cubes working

src/dawn/scene/components/display/Camera.hpp

@@ -7,6 +7,7 @@
 #include "scene/SceneItemComponent.hpp"
 #include "display/RenderTarget.hpp"
 #include "scene/Scene.hpp"
+#include "physics/3d/Ray3D.hpp"
 
 namespace Dawn {
   enum CameraType {
@@ -79,6 +80,18 @@ namespace Dawn {
        */
       float_t getAspect();
 
+      /**
+       * Creates the directional vector for a given point on the screen space
+       * coordinates provided. This is useful if you want to, say, cast a ray
+       * based on a position on the screen. The directional vector is normalized
+       * between -1 and 1 where -1 is the near clipping plane, and 1 is the
+       * far clipping plane.
+       * 
+       * @param screenSpace Screen space vector (-1,-1 to 1,1) on the screen.
+       * @return The vector for the direction to cast from.
+       */
+      glm::vec3 getRayDirectionFromScreenSpace(glm::vec2 screenSpace);
+
       /**
        * Event triggered by the scene item when the item is added to the scene.
        */