diff --git a/src/camera.rs b/src/camera.rs
index bc7b230..6ad1d50 100644
--- a/src/camera.rs
+++ b/src/camera.rs
@@ -70,8 +70,8 @@ impl<'a> Camera<'a> {
             // viewport_width,
             // viewport_height,
             center,
-            look_at,
-            v_up,
+            // look_at,
+            // v_up,
             // focal_length,
             // viewport_u,
             // viewport_v,
@@ -99,7 +99,6 @@ impl<'a> Camera<'a> {
             for i in 0..self.image_width {
                 // color
                 let mut color = Color::new(0.0, 0.0, 0.0);
-                let rng = &mut rng();
                 for _ in 0..self.sample_times {
                     let r = self.get_ray(i, j);
                     let sample_color = self.ray_color(&r, self.reflect_depth, world);
@@ -200,7 +199,7 @@ impl<'a> Camera<'a> {
 
     // -> [x, y, 0]
     fn random_square(&self, rng: &mut ThreadRng) -> Vec3 {
-        Vec3::new(rng.gen_range(-0.5..0.1), rng.gen_range(-0.5..0.1), 0.0)
+        Vec3::new(rng.random_range(-0.5..0.1), rng.random_range(-0.5..0.1), 0.0)
     }
 
 
diff --git a/src/material.rs b/src/material.rs
index 2627753..2effd31 100644
--- a/src/material.rs
+++ b/src/material.rs
@@ -31,7 +31,7 @@ impl Material for Lambertian {
 
         let mut scatter_direction = r_in.direction + Vec3::random_unit_on_hemisphere(hit_record.normal);
 
-        if (near_zero(scatter_direction)) {
+        if near_zero(scatter_direction) {
             scatter_direction = hit_record.normal;
         }
             
diff --git a/src/math_utils.rs b/src/math_utils.rs
index 3ee490d..ddb9c3d 100644
--- a/src/math_utils.rs
+++ b/src/math_utils.rs
@@ -8,7 +8,7 @@ pub fn random_in_unit_disk() -> Vec3 {
     let rng = &mut rng();
     loop {
         let p = Vec3::new(rng.random_range(-1.0..1.0), rng.random_range(-1.0..1.0), 0.0);
-        if (p.length_squared() < 1.0) {
+        if p.length_squared() < 1.0 {
             return p;
         }
     } 
diff --git a/src/types_defined.rs b/src/types_defined.rs
index 21be19d..63b508f 100644
--- a/src/types_defined.rs
+++ b/src/types_defined.rs
@@ -1,5 +1,5 @@
 use std::{fs::File, io::{BufWriter}};
-use crate::{material::MaterialKind, vec3};
+use crate::{material::MaterialKind};
 use crate::ppm_writer::PPMWriter;
 
 /*
@@ -38,8 +38,8 @@ pub struct Camera<'a> {
     // pub viewport_width: f32,
     // pub viewport_height: f32,
     pub center: Point,
-    pub look_at: Point,
-    pub v_up: Vec3,
+    // pub look_at: Point,
+    // pub v_up: Vec3,
     // pub focal_length: Vec3,
     // pub viewport_u: Vec3,
     // pub viewport_v: Vec3,
diff --git a/src/vec3.rs b/src/vec3.rs
index 05b69e3..2f78cd3 100644
--- a/src/vec3.rs
+++ b/src/vec3.rs
@@ -1,7 +1,7 @@
 
 use std::{fmt::Display, ops::{Add, AddAssign, Div, Mul, MulAssign, Sub}};
 use std::fmt;
-use rand::{thread_rng, Rng};
+use rand::{rng, Rng};
 use crate::types_defined::Vec3;
 
 impl Display for Vec3 {
@@ -50,13 +50,13 @@ impl Vec3 {
     }
 
     pub fn random_range(min: f32, max: f32) -> Self {
-        let rng = &mut thread_rng();
-        Vec3::new(rng.gen_range(min..max), rng.gen_range(min..max), rng.gen_range(min..max))
+        let rng = &mut rng();
+        Vec3::new(rng.random_range(min..max), rng.random_range(min..max), rng.random_range(min..max))
     }
 
     pub fn random() -> Self {
-        let rng = &mut thread_rng();
-        Vec3::new(rng.r#gen(), rng.r#gen(), rng.r#gen())
+        let rng = &mut rng();
+        Vec3::new(rng.random(), rng.random(), rng.random())
     }
 
     pub fn random_unit() -> Self {