diff --git a/Cargo.lock b/Cargo.lock
index c0d5dfa..31a7e18 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -214,12 +214,32 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
 
+[[package]]
+name = "chacha20"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f8d983286843e49675a4b7a2d174efe136dc93a18d69130dd18198a6c167601"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "rand_core 0.10.1",
+]
+
 [[package]]
 name = "color_quant"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3d7b894f5411737b7867f4827955924d7c254fc9f4d91a6aad6b097804b1018b"
 
+[[package]]
+name = "cpufeatures"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b2a41393f66f16b0823bb79094d54ac5fbd34ab292ddafb9a0456ac9f87d201"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "crc32fast"
 version = "1.5.0"
@@ -299,6 +319,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "equivalent"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
+
 [[package]]
 name = "exr"
 version = "1.74.0"
@@ -365,6 +391,12 @@ version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
+[[package]]
+name = "foldhash"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9c4f5dac5e15c24eb999c26181a6ca40b39fe946cbe4c263c7209467bc83af2"
+
 [[package]]
 name = "futures-channel"
 version = "0.3.32"
@@ -418,10 +450,24 @@ checksum = "899def5c37c4fd7b2664648c28120ecec138e4d395b459e5ca34f9cce2dd77fd"
 dependencies = [
  "cfg-if",
  "libc",
- "r-efi",
+ "r-efi 5.3.0",
  "wasip2",
 ]
 
+[[package]]
+name = "getrandom"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0de51e6874e94e7bf76d726fc5d13ba782deca734ff60d5bb2fb2607c7406555"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "r-efi 6.0.0",
+ "rand_core 0.10.1",
+ "wasip2",
+ "wasip3",
+]
+
 [[package]]
 name = "gif"
 version = "0.14.2"
@@ -443,6 +489,27 @@ dependencies = [
  "zerocopy",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.15.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9229cfe53dfd69f0609a49f65461bd93001ea1ef889cd5529dd176593f5338a1"
+dependencies = [
+ "foldhash",
+]
+
+[[package]]
+name = "hashbrown"
+version = "0.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4f467dd6dccf739c208452f8014c75c18bb8301b050ad1cfb27153803edb0f51"
+
+[[package]]
+name = "heck"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
+
 [[package]]
 name = "hermit-abi"
 version = "0.5.2"
@@ -518,6 +585,12 @@ dependencies = [
  "want",
 ]
 
+[[package]]
+name = "id-arena"
+version = "2.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d3067d79b975e8844ca9eb072e16b31c3c1c36928edf9c6789548c524d0d954"
+
 [[package]]
 name = "image"
 version = "0.25.10"
@@ -558,6 +631,18 @@ version = "1.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e7c5cedc30da3a610cac6b4ba17597bdf7152cf974e8aab3afb3d54455e371c8"
 
+[[package]]
+name = "indexmap"
+version = "2.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d466e9454f08e4a911e14806c24e16fba1b4c121d1ea474396f396069cf949d9"
+dependencies = [
+ "equivalent",
+ "hashbrown 0.17.0",
+ "serde",
+ "serde_core",
+]
+
 [[package]]
 name = "instant"
 version = "0.1.13"
@@ -610,7 +695,7 @@ version = "0.1.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9afb3de4395d6b3e67a780b6de64b51c978ecf11cb9a462c66be7d4ca9039d33"
 dependencies = [
- "getrandom",
+ "getrandom 0.3.4",
  "libc",
 ]
 
@@ -620,6 +705,12 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
 
+[[package]]
+name = "leb128fmt"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09edd9e8b54e49e587e4f6295a7d29c3ea94d469cb40ab8ca70b288248a81db2"
+
 [[package]]
 name = "lebe"
 version = "0.5.3"
@@ -897,6 +988,16 @@ dependencies = [
  "log",
 ]
 
+[[package]]
+name = "prettyplease"
+version = "0.2.37"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "479ca8adacdd7ce8f1fb39ce9ecccbfe93a3f1344b3d0d97f20bc0196208f62b"
+dependencies = [
+ "proc-macro2",
+ "syn",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.106"
@@ -991,6 +1092,12 @@ version = "5.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "69cdb34c158ceb288df11e18b4bd39de994f6657d83847bdffdbd7f346754b0f"
 
+[[package]]
+name = "r-efi"
+version = "6.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8dcc9c7d52a811697d2151c701e0d08956f92b0e24136cf4cf27b57a6a0d9bf"
+
 [[package]]
 name = "rand"
 version = "0.9.4"
@@ -998,7 +1105,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "44c5af06bb1b7d3216d91932aed5265164bf384dc89cd6ba05cf59a35f5f76ea"
 dependencies = [
  "rand_chacha",
- "rand_core",
+ "rand_core 0.9.5",
+]
+
+[[package]]
+name = "rand"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2e8e8bcc7961af1fdac401278c6a831614941f6164ee3bf4ce61b7edb162207"
+dependencies = [
+ "chacha20",
+ "getrandom 0.4.2",
+ "rand_core 0.10.1",
 ]
 
 [[package]]
@@ -1008,7 +1126,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d3022b5f1df60f26e1ffddd6c66e8aa15de382ae63b3a0c1bfc0e4d3e3f325cb"
 dependencies = [
  "ppv-lite86",
- "rand_core",
+ "rand_core 0.9.5",
 ]
 
 [[package]]
@@ -1017,9 +1135,15 @@ version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "76afc826de14238e6e8c374ddcc1fa19e374fd8dd986b0d2af0d02377261d83c"
 dependencies = [
- "getrandom",
+ "getrandom 0.3.4",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "63b8176103e19a2643978565ca18b50549f6101881c443590420e4dc998a3c69"
+
 [[package]]
 name = "rav1e"
 version = "0.8.1"
@@ -1047,7 +1171,7 @@ dependencies = [
  "num-traits",
  "paste",
  "profiling",
- "rand",
+ "rand 0.9.4",
  "rand_chacha",
  "simd_helpers",
  "thiserror 2.0.18",
@@ -1098,6 +1222,7 @@ dependencies = [
  "log",
  "ops",
  "pretty_env_logger",
+ "rand 0.10.1",
 ]
 
 [[package]]
@@ -1156,6 +1281,12 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
 
+[[package]]
+name = "semver"
+version = "1.0.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a7852d02fc848982e0c167ef163aaff9cd91dc640ba85e263cb1ce46fae51cd"
+
 [[package]]
 name = "serde"
 version = "1.0.228"
@@ -1381,6 +1512,12 @@ version = "1.0.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75"
 
+[[package]]
+name = "unicode-xid"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ebc1c04c71510c7f702b52b7c350734c9ff1295c464a03335b00bb84fc54f853"
+
 [[package]]
 name = "v_frame"
 version = "0.3.9"
@@ -1416,6 +1553,15 @@ dependencies = [
  "wit-bindgen",
 ]
 
+[[package]]
+name = "wasip3"
+version = "0.4.0+wasi-0.3.0-rc-2026-01-06"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5428f8bf88ea5ddc08faddef2ac4a67e390b88186c703ce6dbd955e1c145aca5"
+dependencies = [
+ "wit-bindgen",
+]
+
 [[package]]
 name = "wasm-bindgen"
 version = "0.2.118"
@@ -1461,6 +1607,40 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "wasm-encoder"
+version = "0.244.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "990065f2fe63003fe337b932cfb5e3b80e0b4d0f5ff650e6985b1048f62c8319"
+dependencies = [
+ "leb128fmt",
+ "wasmparser",
+]
+
+[[package]]
+name = "wasm-metadata"
+version = "0.244.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bb0e353e6a2fbdc176932bbaab493762eb1255a7900fe0fea1a2f96c296cc909"
+dependencies = [
+ "anyhow",
+ "indexmap",
+ "wasm-encoder",
+ "wasmparser",
+]
+
+[[package]]
+name = "wasmparser"
+version = "0.244.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "47b807c72e1bac69382b3a6fb3dbe8ea4c0ed87ff5629b8685ae6b9a611028fe"
+dependencies = [
+ "bitflags 2.11.1",
+ "hashbrown 0.15.5",
+ "indexmap",
+ "semver",
+]
+
 [[package]]
 name = "weezl"
 version = "0.1.12"
@@ -1591,6 +1771,88 @@ name = "wit-bindgen"
 version = "0.51.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d7249219f66ced02969388cf2bb044a09756a083d0fab1e566056b04d9fbcaa5"
+dependencies = [
+ "wit-bindgen-rust-macro",
+]
+
+[[package]]
+name = "wit-bindgen-core"
+version = "0.51.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ea61de684c3ea68cb082b7a88508a8b27fcc8b797d738bfc99a82facf1d752dc"
+dependencies = [
+ "anyhow",
+ "heck",
+ "wit-parser",
+]
+
+[[package]]
+name = "wit-bindgen-rust"
+version = "0.51.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b7c566e0f4b284dd6561c786d9cb0142da491f46a9fbed79ea69cdad5db17f21"
+dependencies = [
+ "anyhow",
+ "heck",
+ "indexmap",
+ "prettyplease",
+ "syn",
+ "wasm-metadata",
+ "wit-bindgen-core",
+ "wit-component",
+]
+
+[[package]]
+name = "wit-bindgen-rust-macro"
+version = "0.51.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c0f9bfd77e6a48eccf51359e3ae77140a7f50b1e2ebfe62422d8afdaffab17a"
+dependencies = [
+ "anyhow",
+ "prettyplease",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wit-bindgen-core",
+ "wit-bindgen-rust",
+]
+
+[[package]]
+name = "wit-component"
+version = "0.244.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d66ea20e9553b30172b5e831994e35fbde2d165325bec84fc43dbf6f4eb9cb2"
+dependencies = [
+ "anyhow",
+ "bitflags 2.11.1",
+ "indexmap",
+ "log",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "wasm-encoder",
+ "wasm-metadata",
+ "wasmparser",
+ "wit-parser",
+]
+
+[[package]]
+name = "wit-parser"
+version = "0.244.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ecc8ac4bc1dc3381b7f59c34f00b67e18f910c2c0f50015669dde7def656a736"
+dependencies = [
+ "anyhow",
+ "id-arena",
+ "indexmap",
+ "log",
+ "semver",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "unicode-xid",
+ "wasmparser",
+]
 
 [[package]]
 name = "y4m"
diff --git a/Cargo.toml b/Cargo.toml
index 1414d03..dc98c47 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,3 +8,4 @@ image = "0.25.10"
 log = "0.4.29"
 ops = "0.6.0"
 pretty_env_logger = "0.5.0"
+rand = "0.10.1"
diff --git a/src/camera.rs b/src/camera.rs
index f802efe..15782f2 100644
--- a/src/camera.rs
+++ b/src/camera.rs
@@ -12,6 +12,7 @@ pub struct Camera {
     image_width: u32,
     image_height: u32,
     anti_alias_rate: u32,
+    max_depth: u32,
     center: Vec3,
     pixel00_loc: Vec3,
     pixel_delta_u: Vec3,
@@ -45,6 +46,7 @@ impl Camera {
             image_width: image_width,
             image_height: image_height,
             anti_alias_rate: anti_alias_rate,
+            max_depth: 50,
             center: camera_center,
             pixel00_loc: pixel00_loc,
             pixel_delta_u: pixel_delta_u,
@@ -70,7 +72,7 @@ impl Camera {
                             + (y * self.pixel_delta_v / (self.anti_alias_rate + 1) as f32);
                         let ray_dir = pixel_loc - self.center;
                         let r = Ray::new(self.center, ray_dir);
-                        pixel_colour += self.ray_colour(&hittables, &r);
+                        pixel_colour += self.ray_colour(&hittables, &r, self.max_depth);
                     }
                 }
 
@@ -84,11 +86,15 @@ impl Camera {
         imgbuf.save("output.png").unwrap();
     }
 
-    fn ray_colour<T: Hittable>(&self, hittables: &Vec<T>, r: &Ray) -> Colour {
+    fn ray_colour<T: Hittable>(&self, hittables: &Vec<T>, r: &Ray, depth: u32) -> Colour {
+        if depth <= 0 {
+            return Colour::nil();
+        }
+
         let closest = Hit::hit_list(hittables, r);
         if let Some(hit) = closest {
-            let n = hit.n();
-            return 0.5 * Colour::new(n.x() + 1., n.y() + 1., n.z() + 1.);
+            let dir = *hit.n() + Vec3::random_unit_hemisphere(hit.n());
+            return 0.5 * self.ray_colour(hittables, &Ray::new(*hit.p(), dir), depth - 1);
         }
 
         // background
diff --git a/src/main.rs b/src/main.rs
index e588d88..e3ba50d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -19,6 +19,6 @@ fn main() {
     world.push(Sphere::new(Vec3::new(0., 0., -0.1), 0.01));
     world.push(Sphere::new(Vec3::new(0., -100.5, -1.), 100.));
 
-    let c = Camera::new_aa(16. / 9., 400, 2);
+    let c = Camera::new_aa(16. / 9., 400, 3);
     c.render(&world);
 }
diff --git a/src/objects/hit.rs b/src/objects/hit.rs
index e1514d2..529bd58 100644
--- a/src/objects/hit.rs
+++ b/src/objects/hit.rs
@@ -28,7 +28,9 @@ impl Hit {
         for hittable in hittables {
             if let Some(hit) = hittable.hit(r) {
                 // hit happens in front of camera and is closer than closest
-                if *hit.t() > 0. && (closest.is_none() || closest.as_ref().unwrap().t() > hit.t()) {
+                if *hit.t() > 0.001
+                    && (closest.is_none() || closest.as_ref().unwrap().t() > hit.t())
+                {
                     closest = Some(hit);
                 }
             }
diff --git a/src/vec3.rs b/src/vec3.rs
index d4ebd29..a1b3a15 100644
--- a/src/vec3.rs
+++ b/src/vec3.rs
@@ -4,6 +4,8 @@ use std::{
     ops::{Add, AddAssign, Div, DivAssign, Mul, MulAssign, Neg, Sub, SubAssign},
 };
 
+use rand::RngExt;
+
 #[derive(Copy, Clone)]
 pub struct Vec3 {
     r: f32,
@@ -26,6 +28,33 @@ impl Vec3 {
         }
     }
 
+    pub fn random() -> Vec3 {
+        let mut rng = rand::rng();
+        Vec3 {
+            r: rng.random_range(-1.0..1.),
+            g: rng.random_range(-1.0..1.),
+            b: rng.random_range(-1.0..1.),
+        }
+    }
+
+    pub fn random_unit() -> Vec3 {
+        loop {
+            let v = Vec3::random();
+            if v.length_squared() <= 1. {
+                return v / v.length();
+            }
+        }
+    }
+
+    pub fn random_unit_hemisphere(n: &Vec3) -> Vec3 {
+        let v = Vec3::random_unit();
+        if n.dot(&v) > 0.0 {
+            v
+        } else {
+            -v
+        }
+    }
+
     pub fn x(&self) -> &f32 {
         &self.r
     }
@@ -67,9 +96,26 @@ impl Vec3 {
     }
 
     pub fn output(self) -> image::Rgb<u8> {
-        let ir = (255.599 * self.r.clamp(0., 1.)) as u8;
-        let ig = (255.599 * self.g.clamp(0., 1.)) as u8;
-        let ib = (255.599 * self.b.clamp(0., 1.)) as u8;
+        // gamma correction
+        let r = if self.r > 0. {
+            sqrt(self.r).clamp(0., 1.)
+        } else {
+            0.
+        };
+        let g = if self.g > 0. {
+            sqrt(self.g).clamp(0., 1.)
+        } else {
+            0.
+        };
+        let b = if self.b > 0. {
+            sqrt(self.b).clamp(0.1, 1.)
+        } else {
+            0.
+        };
+
+        let ir = (255.599 * r) as u8;
+        let ig = (255.599 * g) as u8;
+        let ib = (255.599 * b) as u8;
 
         image::Rgb([ir, ig, ib])
     }