diff --git a/zigrtiow/src/main.zig b/zigrtiow/src/main.zig
index e3582a5..275393a 100644
--- a/zigrtiow/src/main.zig
+++ b/zigrtiow/src/main.zig
@@ -51,8 +51,8 @@ pub fn main() anyerror!void {
 
     const material_ground = Material{ .labertian = Labertian{ .albedo = Color.init(0.8, 0.8, 0.0) } };
     const material_center = Material{ .labertian = Labertian{ .albedo = Color.init(0.7, 0.3, 0.3) } };
-    const material_left = Material{ .metal = Metal{ .albedo = Color.init(0.8, 0.8, 0.8) } };
-    const material_right = Material{ .metal = Metal{ .albedo = Color.init(0.8, 0.6, 0.2) } };
+    const material_left = Material{ .metal = Metal{ .albedo = Color.init(0.8, 0.8, 0.8), .fuzz = 0.3 } };
+    const material_right = Material{ .metal = Metal{ .albedo = Color.init(0.8, 0.6, 0.2), .fuzz = 1.0 } };
 
     try tmp_world.add(Hittable{ .sphere = Sphere.init(Point3.init(0, -100.5, -1), 100, material_ground) });
     try tmp_world.add(Hittable{ .sphere = Sphere.init(Point3.init(0, 0, -1), 0.5, material_center) });
diff --git a/zigrtiow/src/material.zig b/zigrtiow/src/material.zig
index 223b311..252f68c 100644
--- a/zigrtiow/src/material.zig
+++ b/zigrtiow/src/material.zig
@@ -5,6 +5,7 @@ const HitRecord = @import("./hittable.zig").HitRecord;
 const Vec3 = vec.Vec3;
 const Color = vec.Color;
 const random_unit_vector = vec.random_unit_vector;
+const random_in_unit_sphere = vec.random_in_unit_sphere;
 
 pub const Material = union(enum) {
     labertian: Labertian,
@@ -37,9 +38,11 @@ pub const Labertian = struct {
 
 pub const Metal = struct {
     albedo: Vec3,
+    fuzz: f32,
+
     pub fn scatter(metal: Metal, r_in: Ray, rec: HitRecord) ?ScatterRec {
         const reflected = reflect(r_in.direction().unit(), rec.normal);
-        const scattered = Ray.init(rec.p, reflected);
+        const scattered = Ray.init(rec.p, reflected.add(random_in_unit_sphere().scale(metal.fuzz)));
         const attenuation = metal.albedo;
         if (scattered.direction().dot(rec.normal) > 0) {
             return ScatterRec{