Add lambertian and metallic materials

1 files changed, 4 insertions, 0 deletions

diff --git a/include/vec3.hpp b/include/vec3.hpp
index 7b0e469..317f99b 100644
--- a/include/vec3.hpp
+++ b/include/vec3.hpp
@@ -28,6 +28,8 @@ class vec3 {
 
     vec3 unit() const;
 
+    bool near_zero() const;
+
     static vec3 random();
 
     static vec3 random(double min, double max);
@@ -49,6 +51,8 @@ vec3 operator*(double scale, vec3 u);
 
 vec3 operator/(vec3 u, double scale);
 
+vec3 reflect(vec3 v, vec3 n);
+
 std::ostream& operator<<(std::ostream& out, vec3 vec);
 
 vec3 random_in_unit_sphere();