Render a sphere

Fix errors in the renderer

1 files changed, 2 insertions, 2 deletions

diff --git a/include/vec3.hpp b/include/vec3.hpp
index 801b0b5..48f0ae3 100644
--- a/include/vec3.hpp
+++ b/include/vec3.hpp
@@ -22,9 +22,9 @@ class vec3 {
 
     double length_sq();
 
-    double dot(vec3& vec);
+    double dot(const vec3& vec) const;
 
-    vec3 cross(vec3& vec);
+    vec3 cross(const vec3& vec) const;
 
     vec3 unit();