diff --git a/RayTracer/camera/Ray.h b/RayTracer/camera/Ray.h
index 27b1241a6a89d0b6d5c511be9e597368b2fd7b11..4c9e8f7a3cb0ea033ed0033cbbb9d6acee0747d5 100644
--- a/RayTracer/camera/Ray.h
+++ b/RayTracer/camera/Ray.h
@@ -18,4 +18,5 @@ class Ray {
 	const float tmin, tmax;
 	const bool normalize;
 };
+const float epsilon = pow(10, -4);
 }  // namespace cam