diff --git a/src/RayTracer.cc b/src/RayTracer.cc
index 1209fae..bdd3e3a 100644
--- a/src/RayTracer.cc
+++ b/src/RayTracer.cc
@@ -45,14 +45,14 @@ void RayTracer::render() {
   Vector3f cameraPos = Scene::current->center();
   Vector3f lookAt = Scene::current->lookAt();
   float vpHeight =
-      2 * tan(Scene ::current->fov() / 180 * M_PI / 2) * lookAt.norm();
+      2 * tan(Scene::current->fov() / 180 * M_PI / 2) * lookAt.norm();
   float vpWidth = vpHeight * width / height;
-  Vector3f vpU = Vector3f(vpWidth, 0, 0);
-  Vector3f vpV = Vector3f(0, -vpHeight, 0);
-  Vector3f du = vpU / width;
-  Vector3f dv = vpV / height;
+  Vector3f u = Vector3f(vpWidth, 0, 0);
+  Vector3f v = Vector3f(0, -vpHeight, 0);
+  Vector3f du = u / width;
+  Vector3f dv = v / height;
 
-  Vector3f vpUpperLeft = cameraPos + lookAt - vpU / 2.0 - vpV / 2.0;
+  Vector3f vpUpperLeft = cameraPos + lookAt - u / 2.0 - v / 2.0;
   Vector3f pxUpperLeft = vpUpperLeft + (du + dv) / 2.0;
 
   Output::current = new Output(Scene::current->backgroundColor(),