Add CLI and gnuplot interface

1 files changed, 2 insertions, 0 deletions

diff --git a/vec3.h b/vec3.h
index cb51f23..df68104 100644
--- a/vec3.h
+++ b/vec3.h
@@ -31,4 +31,6 @@ class vec3 {
 vec3 operator*(scalar scale, const vec3 &v);
 
 std::ostream &operator<<(std::ostream &output, const vec3 &v);
+std::istream &operator>>(std::istream &input, vec3 &v);
+
 #endif