diff --git a/include/zeus/CMRay.hpp b/include/zeus/CMRay.hpp
index 94258fe..f7eddd3 100644
--- a/include/zeus/CMRay.hpp
+++ b/include/zeus/CMRay.hpp
@@ -28,9 +28,9 @@ struct CMRay
         end = invD * delta;
     }
 
-    CMRay getInvUnscaledTransformRay(const CTransform& xfrm)
+    CMRay getInvUnscaledTransformRay(const CTransform& xfrm) const
     {
-        CTransform inv = xfrm.inverse();
+        const CTransform inv = xfrm.inverse();
         return CMRay(inv * start, inv * normal, d, invD);
     }
 
diff --git a/include/zeus/COBBox.hpp b/include/zeus/COBBox.hpp
index 1db13b0..f5ccae9 100644
--- a/include/zeus/COBBox.hpp
+++ b/include/zeus/COBBox.hpp
@@ -4,6 +4,7 @@
 #include "zeus/CTransform.hpp"
 #include "zeus/CVector3f.hpp"
 #include "zeus/CAABox.hpp"
+#include "zeus/CMRay.hpp"
 
 namespace zeus
 {
@@ -38,9 +39,10 @@ public:
         transform.origin = aabb.center();
     }
 
-    COBBox(const CTransform& xf, const CVector3f& point)
+    COBBox(const CTransform& xf, const CVector3f& extents)
+        : transform(xf),
+          extents(extents)
     {
-
     }
 
     CAABox calculateAABox(const CTransform& transform = CTransform()) const