diff --git a/src/object.cc b/src/object.cc
index b74dcbe..866ffc3 100644
--- a/src/object.cc
+++ b/src/object.cc
@@ -12,32 +12,26 @@
 #include "basics.h"
 #include "material.h"
 #include "object.h"
+#include "basics/basics.hh"
+
+
+using charles::basics::Vector4;
+
 
 namespace charles {
 
 #pragma mark - Objects
 
-/*
- * Object::Object --
- *
- * Default constructor. Create a new Object with an origin at (0, 0, 0).
- */
-Object::Object()
-    : Object(Vector3::Zero)
-{ }
-
-
-/*
- * Object::Object --
- *
- * Constructor. Create a new Object with an origin at o.
- */
-Object::Object(Vector3 origin)
-    : mOrigin(origin),
+Object::Object(const Vector4& origin)
+    : mTranslation(basics::TranslationMatrix(origin.X(), origin.Y(), origin.Z())),
       mMaterial()
 { }
 
 
+/*
+ */
+
+
 Vector3
 Object::GetOrigin()
     const
diff --git a/src/object.h b/src/object.h
index 4f906a7..4480edb 100644
--- a/src/object.h
+++ b/src/object.h
@@ -18,6 +18,8 @@
 #include "stats.hh"
 #include "texture.h"
 #include "types.hh"
+#include "basics/basics.hh"
+
 
 namespace charles {
 
@@ -25,8 +27,7 @@ struct Object
 {
     typedef std::shared_ptr<Object> Ptr;
 
-    Object();
-    Object(Vector3 o);
+    Object(const basics::Vector4& origin = basics::Vector4());
     virtual ~Object();
 
     Vector3 GetOrigin() const;
diff --git a/src/objectSphere.cc b/src/objectSphere.cc
index 5adfb4d..d0ea008 100644
--- a/src/objectSphere.cc
+++ b/src/objectSphere.cc
@@ -14,32 +14,19 @@
 #include "object.h"
 #include "objectSphere.hh"
 
+
+using charles::basics::Vector4;
+
+
 namespace charles {
 
 /*
- * Sphere::Sphere --
- *
- * Default constructor. Create a Sphere with radius 1.0.
+ * charles::Sphere::Sphere --
  */
-Sphere::Sphere()
-    : Sphere(1.0)
-{ }
-
-
-/*
- * Sphere::Sphere --
- *
- * Constructor. Create a Sphere with the given radius.
- */
-Sphere::Sphere(Double r)
-    : Sphere(Vector3::Zero, r)
-{ }
-
-
-Sphere::Sphere(Vector3 o,
-               Double r)
-    : Object(o),
-      mRadius(r)
+Sphere::Sphere(const Vector4& origin,
+               Double radius)
+    : Object(origin),
+      mRadius(radius)
 { }
 
 
@@ -69,13 +56,10 @@ Sphere::DoesIntersect(const Ray& ray,
 {
     stats.sphereIntersectionTests++;
 
-    /* Origin of the vector in object space. */
-    Vector3 rayOriginObj = ray.origin - GetOrigin();
-
     /* Coefficients for quadratic equation. */
     Double a = ray.direction.dot(ray.direction);
-    Double b = ray.direction.dot(rayOriginObj) * 2.0;
-    Double c = rayOriginObj.dot(rayOriginObj) - (mRadius * mRadius);
+    Double b = ray.direction.dot(ray.origin) * 2.0;
+    Double c = ray.origin.dot(ray.origin) - (mRadius * mRadius);
 
     /* Discriminant for the quadratic equation. */
     Double discrim = (b * b) - (4.0 * a * c);
diff --git a/src/objectSphere.hh b/src/objectSphere.hh
index 12f9061..9597868 100644
--- a/src/objectSphere.hh
+++ b/src/objectSphere.hh
@@ -10,6 +10,8 @@
 
 #include "basics.h"
 #include "object.h"
+#include "basics/basics.hh"
+
 
 namespace charles {
 
@@ -17,9 +19,7 @@ class Sphere
     : public Object
 {
 public:
-    Sphere();
-    Sphere(Double r);
-    Sphere(Vector3 o, Double r);
+    Sphere(const basics::Vector4& origin = basics::Vector4(), Double radius = 1.0);
 
     Double GetRadius() const;
     void SetRadius(Double r);