diff --git a/Cargo.toml b/Cargo.toml
index 5417d38..4f4780b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-rand = "0.7.0"
+rand = "0.10.0"
 rayon = "1.8"
 image = "0.25.9"
-indicatif = "0.18.3"
\ No newline at end of file
+indicatif = "0.18.4"
\ No newline at end of file
diff --git a/example.png b/example.png
index 979ba45..a3fff5d 100644
Binary files a/example.png and b/example.png differ
diff --git a/src/camera.rs b/src/camera.rs
index bf7d1b8..50e3ab6 100644
--- a/src/camera.rs
+++ b/src/camera.rs
@@ -1,3 +1,4 @@
+use crate::hittable::Hittable;
 use crate::ray::Ray;
 use crate::rtweekend::degrees_to_radians;
 use crate::vec3::*;
@@ -9,8 +10,7 @@ pub struct Camera {
     vertical: Vec3,
     u: Vec3,
     v: Vec3,
-    w: Vec3,
-    lens_radius: f64,    
+    lens_radius: f64,
 }
 
 impl Camera {
@@ -18,13 +18,15 @@ impl Camera {
         lookfrom: Point3,
         lookat: Point3,
         vup: Vec3,
-        vfov: f64,
+        focal_length_mm: f64,
         aspect_ratio: f64,
-        apeture: f64,
+        defocus_angle: f64,
         focus_dist: f64,
     ) -> Self {
-        let theta = degrees_to_radians(vfov);
-        let h = f64::tan(theta/2.0);
+        let sensor_height = 24.0; // in mm
+        let theta = 2.0 * f64::atan(sensor_height / (2.0 * focal_length_mm));
+
+        let h = f64::tan(theta / 2.0);
         let viewport_height = 2.0 * h;
         let viewport_width = aspect_ratio * viewport_height;
 
@@ -35,20 +37,57 @@ impl Camera {
         let origin = lookfrom;
         let horizontal = focus_dist * viewport_width * u;
         let vertical = focus_dist * viewport_height * v;
-        let lower_left_corner = origin - horizontal/2.0 - vertical/2.0 - focus_dist * w;
+        let lower_left_corner = origin - horizontal / 2.0 - vertical / 2.0 - focus_dist * w;
 
-        let lens_radius = apeture / 2.0;
+        let defocus_theta = degrees_to_radians(defocus_angle);
+        let lens_radius = focus_dist * f64::tan(defocus_theta / 2.0);
 
-        Camera { origin, lower_left_corner, horizontal, vertical, u, v, w, lens_radius}
+        Camera {
+            origin,
+            lower_left_corner,
+            horizontal,
+            vertical,
+            u,
+            v,
+            lens_radius,
+        }
     }
 
     pub fn get_ray(&self, s: f64, t: f64) -> Ray {
         let rd = self.lens_radius * random_in_unit_disk();
         let offset = self.u * rd.x() + self.v * rd.y();
 
+        let ray_origin = self.origin + offset;
+
         Ray {
-            origin: self.origin,
-            direction: self.lower_left_corner + s*self.horizontal + t*self.vertical - self.origin - offset
+            origin: ray_origin,
+            direction: self.lower_left_corner + s * self.horizontal + t * self.vertical
+                - ray_origin,
         }
     }
-}
\ No newline at end of file
+
+    pub fn ray_color(&self, r: Ray, world: &dyn Hittable, depth: i32) -> Color {
+        // Limit the bounces
+        if depth <= 0 {
+            return Color::new(0.0, 0.0, 0.0);
+        }
+
+        if let Some(rec) = world.hit(&r, 0.001, f64::INFINITY) {
+            let mut scattered = Ray::new_empty();
+            let mut attenuation = Color::new_empty();
+
+            if rec
+                .material
+                .scatter(r, rec, &mut attenuation, &mut scattered)
+            {
+                return attenuation * Self::ray_color(&self, scattered, world, depth - 1);
+            }
+            return Color::new_empty();
+        }
+
+        let unit_direction: Vec3 = r.direction().unit_vector();
+        let t = 0.5 * (unit_direction.y() + 1.0);
+
+        ((1.0 - t) * Color::new(1.0, 1.0, 1.0)) + (t * Color::new(0.5, 0.7, 1.0))
+    }
+}
diff --git a/src/hittable.rs b/src/hittable.rs
index 8314654..008422e 100644
--- a/src/hittable.rs
+++ b/src/hittable.rs
@@ -6,14 +6,14 @@ use crate::vec3::*;
 pub struct HitRecord<'a> {
     pub p: Point3,
     pub normal: Vec3,
-    pub mat_ptr: &'a dyn Material,
+    pub material: &'a dyn Material,
     pub t: f64,
     pub front_face: bool,
 }
 
 impl HitRecord<'_> {
     pub fn new_empty<T: Material>(material: &'static T) -> Self {
-        HitRecord { p: Point3::new(0.0, 0.0, 0.0), normal: Vec3::new(0.0, 0.0, 0.0), t: 0.0, front_face: false, mat_ptr: material  }
+        HitRecord { p: Point3::new(0.0, 0.0, 0.0), normal: Vec3::new(0.0, 0.0, 0.0), t: 0.0, front_face: false, material: material  }
     }
 
     pub fn set_face_normal(&mut self, r: &Ray, outward_normal: Vec3) {
diff --git a/src/main.rs b/src/main.rs
index 06f663b..231b339 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -17,7 +17,6 @@ use rayon::prelude::*;
 use crate::{
     camera::*,
     color::*,
-    hittable::*,
     hittable_list::*,
     material::*,
     material::{Dielectric, Lambertian},
@@ -27,7 +26,8 @@ use crate::{
     vec3::*,
 };
 
-fn random_scene() -> HittableList {
+#[allow(dead_code)]
+fn random_scene(aspect_ratio: f64) -> (Camera, HittableList) {
     let mut world = HittableList::new_empty();
 
     let ground_material: Lambertian = Lambertian::new(Color::new(0.5, 0.5, 0.5));
@@ -47,16 +47,28 @@ fn random_scene() -> HittableList {
             );
 
             if (center - Point3::new(4.0, 0.2, 0.0)).length() > 0.9 {
-                if choose_mat < 0.8 {
+                if choose_mat < 0.3 {
                     //let albedo = Color::new(0.3, 0.8, 0.4);
                     let sphere_material: Lambertian = Lambertian::new(Color::random());
-                    world.add(Box::new(Sphere::new(center, 0.2, Box::new(sphere_material))));
-                } else if choose_mat < 0.95 {
+                    world.add(Box::new(Sphere::new(
+                        center,
+                        0.2,
+                        Box::new(sphere_material),
+                    )));
+                } else if choose_mat < 0.7 {
                     let sphere_material: Metal = Metal::new(Color::random(), 0.2);
-                    world.add(Box::new(Sphere::new(center, 0.2, Box::new(sphere_material))));
+                    world.add(Box::new(Sphere::new(
+                        center,
+                        0.2,
+                        Box::new(sphere_material),
+                    )));
                 } else {
                     let sphere_material: Dielectric = Dielectric::new(1.5);
-                    world.add(Box::new(Sphere::new(center, 0.2, Box::new(sphere_material))));
+                    world.add(Box::new(Sphere::new(
+                        center,
+                        0.2,
+                        Box::new(sphere_material),
+                    )));
                 }
             }
         }
@@ -83,32 +95,85 @@ fn random_scene() -> HittableList {
         Box::new(material3),
     )));
 
-    world
+    // Camera
+    let lookfrom = Point3::new(13.0, 2.0, 3.0);
+    let lookat = Point3::new(0.0, 0.0, 0.0);
+    let vup = Vec3::new(0.0, 1.0, 0.0);
+    let dist_to_focus = (lookfrom - lookat).length();
+    let focal_length = 50.0;
+    let defocus_angle = 1.;
+
+    let cam = Camera::new(
+        lookfrom,
+        lookat,
+        vup,
+        focal_length,
+        aspect_ratio,
+        defocus_angle,
+        dist_to_focus,
+    );
+
+    (cam, world)
 }
 
-fn ray_color(r: Ray, world: &dyn Hittable, depth: i32) -> Color {
-    // Limit the bounces
-    if depth <= 0 {
-        return Color::new(0.0, 0.0, 0.0);
-    }
+#[allow(dead_code)]
+fn three_balls_scene(aspect_ratio: f64) -> (Camera, HittableList) {
+    let mut world = HittableList::new_empty();
 
-    if let Some(rec) = world.hit(&r, 0.001, INFINITY) {
-        let mut scattered = Ray::new_empty();
-        let mut attenuation = Color::new_empty();
+    let material_ground: Lambertian = Lambertian::new(Color::new(0.8, 0.8, 0.0));
+    world.add(Box::new(Sphere::new(
+        Point3::new(0.0, -100.5, -1.0),
+        100.0,
+        Box::new(material_ground),
+    )));
 
-        if rec
-            .mat_ptr
-            .scatter(r, rec, &mut attenuation, &mut scattered)
-        {
-            return attenuation * ray_color(scattered, world, depth - 1);
-        }
-        return Color::new_empty();
-    }
+    let material_center = Lambertian::new(Color::new(0.1, 0.2, 0.5));
+    world.add(Box::new(Sphere::new(
+        Point3::new(0.0, 0.0, -1.2),
+        0.5,
+        Box::new(material_center),
+    )));
 
-    let unit_direction: Vec3 = r.direction().unit_vector();
-    let t = 0.5 * (unit_direction.y() + 1.0);
+    let material_left = Dielectric::new(1.5);
+    world.add(Box::new(Sphere::new(
+        Point3::new(-1.0, 0.0, -1.0),
+        0.5,
+        Box::new(material_left),
+    )));
 
-    ((1.0 - t) * Color::new(1.0, 1.0, 1.0)) + (t * Color::new(0.5, 0.7, 1.0))
+    let material_bubble = Dielectric::new(1.0 / 1.5);
+    world.add(Box::new(Sphere::new(
+        Point3::new(-1.0, 0.0, -1.0),
+        0.4,
+        Box::new(material_bubble),
+    )));
+
+    let material_right = Metal::new(Color::new(0.8, 0.6, 0.2), 1.0);
+    world.add(Box::new(Sphere::new(
+        Point3::new(1.0, 0.0, -1.0),
+        0.5,
+        Box::new(material_right),
+    )));
+
+    // Camera
+    let lookfrom = Point3::new(-2.0, 2.0, 1.0);
+    let lookat = Point3::new(0.0, 0.0, -1.0);
+    let vup = Vec3::new(0.0, 1.0, 0.0);
+    let dist_to_focus = 10.0; //(lookfrom - lookat).length_squared();
+    let vfov = 20.0;
+    let defocus_angle = 0.0;
+
+    let cam = Camera::new(
+        lookfrom,
+        lookat,
+        vup,
+        vfov,
+        aspect_ratio,
+        defocus_angle,
+        dist_to_focus,
+    );
+
+    (cam, world)
 }
 
 fn main() {
@@ -117,26 +182,10 @@ fn main() {
     let image_width: i32 = 1920;
     let image_height: i32 = (image_width as f64 / aspect_ratio as f64) as i32;
     let samples_per_pixel: i32 = 200;
-    let max_depth: i32 = 5;
+    let max_depth: i32 = 10;
 
-    // World
-    let world = random_scene();
-
-    // Camera
-    let lookfrom = Point3::new(13.0, 2.0, 3.0);
-    let lookat = Point3::new(0.0, 0.0, 0.0);
-    let vup = Vec3::new(0.0, 1.0, 0.0);
-    let dist_to_focus = 10.0; //(lookfrom-lookat).length_squared();
-
-    let cam = Camera::new(
-        lookfrom,
-        lookat,
-        vup,
-        30.0,
-        aspect_ratio,
-        0.0,
-        dist_to_focus,
-    );
+    // Camera and World
+    let (cam, world) = random_scene(aspect_ratio);
 
     let num_threads: usize = match available_parallelism() {
         Ok(threads) => threads.into(),
@@ -174,7 +223,7 @@ fn main() {
                 let u = (x as f64 + random_f64()) / (image_width - 1) as f64;
                 let v = (reversed_y as f64 + random_f64()) / (image_height - 1) as f64;
                 let r = cam.get_ray(u, v);
-                pixel_color += ray_color(r, &world, max_depth);
+                pixel_color += cam.ray_color(r, &world, max_depth);
             }
 
             let (ir, ig, ib) = get_scaled_color_components(pixel_color, samples_per_pixel);
diff --git a/src/material.rs b/src/material.rs
index 8749f3e..32ad529 100644
--- a/src/material.rs
+++ b/src/material.rs
@@ -1,7 +1,7 @@
 use crate::hittable::HitRecord;
 use crate::ray::Ray;
 use crate::rtweekend::random_f64;
-use crate::vec3::{Color, random_unit_vector, reflect, refract};
+use crate::vec3::{random_unit_vector, reflect, refract, Color};
 
 //More rusty
 /*
@@ -15,9 +15,14 @@ use crate::vec3::{Color, random_unit_vector, reflect, refract};
     }
 */
 
-
 pub trait Material: Send + Sync {
-    fn scatter(&self, r_in: Ray, rec: HitRecord, attenuation: &mut Color, scattered: &mut Ray) -> bool;
+    fn scatter(
+        &self,
+        r_in: Ray,
+        rec: HitRecord,
+        attenuation: &mut Color,
+        scattered: &mut Ray,
+    ) -> bool;
 }
 
 pub struct Lambertian {
@@ -31,7 +36,13 @@ impl Lambertian {
 }
 
 impl Material for Lambertian {
-    fn scatter(&self, _r_in: Ray, rec: HitRecord, attenuation: &mut Color, scattered: &mut Ray) -> bool {
+    fn scatter(
+        &self,
+        _r_in: Ray,
+        rec: HitRecord,
+        attenuation: &mut Color,
+        scattered: &mut Ray,
+    ) -> bool {
         let mut scatter_direction = rec.normal + random_unit_vector();
 
         if scatter_direction.near_zero() {
@@ -56,9 +67,16 @@ impl Metal {
 }
 
 impl Material for Metal {
-    fn scatter(&self, r_in: Ray, rec: HitRecord, attenuation: &mut Color, scattered: &mut Ray) -> bool {
-        let reflected = reflect(&r_in.direction(), &rec.normal);
-        *scattered = Ray::new(rec.p, reflected + self.fuzz*random_unit_vector());
+    fn scatter(
+        &self,
+        r_in: Ray,
+        rec: HitRecord,
+        attenuation: &mut Color,
+        scattered: &mut Ray,
+    ) -> bool {
+        let mut reflected = reflect(&r_in.direction(), &rec.normal);
+        reflected = reflected.unit_vector() + (self.fuzz * random_unit_vector());
+        *scattered = Ray::new(rec.p, reflected + self.fuzz * random_unit_vector());
         *attenuation = self.albedo;
 
         scattered.direction().dot(&rec.normal) > 0.0
@@ -76,29 +94,37 @@ impl Dielectric {
 
     fn reflectance(&self, cosine: f64, ref_idx: f64) -> f64 {
         // Schlick
-        let mut r0 = (1.0-ref_idx) / (1.0+ref_idx);
-        r0 = r0*r0;
+        let mut r0 = (1.0 - ref_idx) / (1.0 + ref_idx);
+        r0 = r0 * r0;
 
-        return r0 + (1.0-r0)*f64::powf(1.0 - cosine, 5.0);
+        return r0 + (1.0 - r0) * f64::powf(1.0 - cosine, 5.0);
     }
 }
 
 impl Material for Dielectric {
-    fn scatter(&self, r_in: Ray, rec: HitRecord, attenuation: &mut Color, scattered: &mut Ray) -> bool {
+    fn scatter(
+        &self,
+        r_in: Ray,
+        rec: HitRecord,
+        attenuation: &mut Color,
+        scattered: &mut Ray,
+    ) -> bool {
         *attenuation = Color::new(1.0, 1.0, 1.0);
         let refraction_ratio: f64 = if rec.front_face {
-            1.0/self.ir
+            1.0 / self.ir
         } else {
             self.ir
         };
 
         let unit_direction = r_in.direction().unit_vector();
         let cos_theta = f64::min(-unit_direction.dot(&rec.normal), 1.0);
-        let sin_theta = f64::sqrt(1.0 - cos_theta*cos_theta);
+        let sin_theta = f64::sqrt(1.0 - cos_theta * cos_theta);
 
-        let cannot_refract = (refraction_ratio * sin_theta )> 1.0;
+        let cannot_refract = (refraction_ratio * sin_theta) > 1.0;
 
-        let direction = if cannot_refract || Dielectric::reflectance(self, cos_theta, refraction_ratio) > random_f64() {
+        let direction = if cannot_refract
+            || Dielectric::reflectance(self, cos_theta, refraction_ratio) > random_f64()
+        {
             reflect(&unit_direction, &rec.normal)
         } else {
             refract(&unit_direction, &rec.normal, refraction_ratio)
@@ -107,4 +133,4 @@ impl Material for Dielectric {
         *scattered = Ray::new(rec.p, direction);
         true
     }
-}
\ No newline at end of file
+}
diff --git a/src/rtweekend.rs b/src/rtweekend.rs
index 0dbf732..bac8296 100644
--- a/src/rtweekend.rs
+++ b/src/rtweekend.rs
@@ -1,26 +1,22 @@
-use rand::Rng;
-
-// Constants
-pub const INFINITY: f64 = std::f64::INFINITY;
-pub const PI: f64 = std::f64::consts::PI;
+use rand::RngExt;
 
 // Utility Functions
 pub fn degrees_to_radians(degrees: f64) -> f64 {
     degrees * std::f64::consts::PI / 180.0
 }
 
-// PLEASE CHANGE
 pub fn random_f64() -> f64 {
-    rand::thread_rng().gen()
+    rand::rng().random()
 }
 
-// PLEASE CHANGE
 pub fn random_range_f64(min: f64, max: f64) -> f64 {
-    rand::thread_rng().gen_range(min, max)
+    rand::rng().random_range(min..max)
 }
 
 pub fn clamp(x: f64, min: f64, max: f64) -> f64 {
     if x < min { return min; }
     if x > max { return max; }
     x
-}
\ No newline at end of file
+}
+
+// TODO: für jeden thread einen rng() erstellen und danach droppen, anstatt für jede execution rand::rng()
\ No newline at end of file
diff --git a/src/sphere.rs b/src/sphere.rs
index 6c9e9e3..b79ba9a 100644
--- a/src/sphere.rs
+++ b/src/sphere.rs
@@ -8,12 +8,12 @@ use crate::Ray;
 pub struct Sphere {
     center: Point3,
     radius: f64,
-    mat_ptr: Box<dyn Material>,
+    material: Box<dyn Material>,
 }
 
 impl Sphere {
-    pub fn new<T: Material + 'static>(center: Point3, radius: f64, mat_ptr: Box<T>) -> Self {
-        Sphere {center, radius, mat_ptr}
+    pub fn new<T: Material + 'static>(center: Point3, radius: f64, material: Box<T>) -> Self {
+        Sphere {center, radius, material}
     }
 }
 
@@ -54,7 +54,7 @@ impl Hittable for Sphere {
             p: p,
             normal: outward_normal,
             front_face,
-            mat_ptr: self.mat_ptr.deref(),
+            material: self.material.deref(),
         })
     }
 }
\ No newline at end of file