diff --git a/src/RayTracer.cc b/src/RayTracer.cc
index 5e61b0f..ce579d5 100644
--- a/src/RayTracer.cc
+++ b/src/RayTracer.cc
@@ -2,7 +2,8 @@
 #include "../external/simpleppm.h"
 #include "Parser.h"
 #include "Ray.h"
-#include <Eigen/src/Core/Matrix.h>
+
+#include <Eigen/Core>
 #include <cmath>
 
 void RayTracer::parse() {
@@ -18,12 +19,11 @@ void RayTracer::parse() {
 
 Ray getRay(int x, int y, const Vector3f &camPos, const Vector3f &lookat,
            float fov, int width, int height) {
-  // TODO: compute ray
   float focalLength = lookat.norm();
   float theta = fov / 180 * 3.14159;
   float h = tan(theta / 2);
   float viewportHeight = 2 * h * focalLength;
-  float viewportWidth = viewportHeight * width / height;
+  float viewportWidth = viewportHeight * (float)width / height;
   Vector3f viewportU = Vector3f(viewportWidth, 0, 0);
   Vector3f viewportV = Vector3f(0, -viewportHeight, 0);