diff --git a/src/hittable.rs b/src/hittable.rs
index 430d202..8c9c728 100644
--- a/src/hittable.rs
+++ b/src/hittable.rs
@@ -3,7 +3,7 @@ use super::Ray;
 use super::Vec3;
 
 pub struct HitRecord {
-    p: Point3,
+    pub p: Point3,
     pub normal: Vec3,
     pub t: f64,
     front_face: bool,
diff --git a/src/main.rs b/src/main.rs
index 572353c..1a9bbc3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -19,11 +19,16 @@ use image::{Rgb, RgbImage};
 use ray::Ray;
 use vec3::{Color, Point3, Vec3};
 
-fn ray_color(r: &Ray, world: &HittableList) -> Color {
+fn ray_color(r: &Ray, world: &HittableList, depth: u32) -> Color {
     let mut rec = HitRecord::empty();
 
+    if depth <= 0 {
+        return Color::new(0.0,0.0,0.0);
+    }
+
     if world.hit(r, 0.0, f64::INFINITY, &mut rec) {
-        return 0.5 * (rec.normal + Color::new(1.0, 1.0, 1.0));
+        let target = rec.p + rec.normal + Vec3::random_in_unit_sphere();
+        return 0.5 * ray_color(&Ray::new(rec.p, target - rec.p), world, depth-1);
     }
     let unit_direction = r.direction();
     let t = 0.5 * (unit_direction.y() + 1.0);
@@ -38,7 +43,8 @@ fn main() {
     let aspect_ratio = 16.0 / 9.0;
     let image_width = 1000;
     let image_height = (image_width as f64 / aspect_ratio) as u32;
-    let samples_per_pixel = 50_u32;
+    let samples_per_pixel = 10_u32;
+    let max_depth = 50;
 
     // World
     let mut world = HittableList::new();
@@ -47,7 +53,7 @@ fn main() {
         0.5,
     )));
     world.add(Box::<Sphere>::new(Sphere::new(
-        Point3::new(0.0, -100.5, -150.0),
+        Point3::new(0.0, -100.5, -1.0),
         100.0,
     )));
     world.add(Box::<Sphere>::new(Sphere::new(
@@ -93,7 +99,7 @@ fn main() {
                 let u = (i as f64 + utility::random_f64()) / (image_width - 1) as f64;
                 let v = (j as f64 + utility::random_f64()) / (image_height - 1) as f64;
                 let r = cam.get_ray(u, v);
-                pixel_color += ray_color(&r, &mut world);
+                pixel_color += ray_color(&r, &mut world, max_depth);
             }
 
             //color::write_color(&mut file, &pixel_color);
diff --git a/src/vec3.rs b/src/vec3.rs
index 426df5b..f694aaf 100644
--- a/src/vec3.rs
+++ b/src/vec3.rs
@@ -1,4 +1,5 @@
 use std::ops::*;
+use super::utility;
 
 #[derive(Clone, Copy, Debug)]
 pub struct Vec3 {
@@ -37,6 +38,22 @@ impl Vec3 {
         a / a.length()
     }
 
+    pub fn random_f64() -> Vec3 {
+        Vec3::new(utility::random_f64(),utility::random_f64(),utility::random_f64())
+    }
+
+    pub fn random_rng(min: f64, max: f64) -> Self {
+        Self::new(utility::random_rng(min,max), utility::random_rng(min,max), utility::random_rng(min,max))
+    }
+
+    pub fn random_in_unit_sphere() -> Self {
+        loop {
+            let p = Vec3::random_rng(-1.0, 1.0);
+            if p.length_squared() >= 1.0 { continue };
+            return p;
+        }
+    }
+
     pub fn x(&self) -> f64 {
         self.e[0]
     }