diff --git a/rtchallenge/rustfmt.toml b/rtchallenge/rustfmt.toml
index 16bdde9..bcd436a 100644
--- a/rtchallenge/rustfmt.toml
+++ b/rtchallenge/rustfmt.toml
@@ -1 +1,2 @@
+imports_granularity = "Crate"
 format_code_in_doc_comments = true
diff --git a/rtiow/noise_explorer/rustfmt.toml b/rtiow/noise_explorer/rustfmt.toml
new file mode 100644
index 0000000..bcd436a
--- /dev/null
+++ b/rtiow/noise_explorer/rustfmt.toml
@@ -0,0 +1,2 @@
+imports_granularity = "Crate"
+format_code_in_doc_comments = true
diff --git a/rtiow/noise_explorer/src/main.rs b/rtiow/noise_explorer/src/main.rs
index c38d682..2227c55 100644
--- a/rtiow/noise_explorer/src/main.rs
+++ b/rtiow/noise_explorer/src/main.rs
@@ -11,7 +11,6 @@ use actix_web::Path;
 use actix_web::Query;
 use actix_web::Result;
 use askama::Template;
-use image;
 use log::info;
 use rand::SeedableRng;
 use rand_xorshift::XorShiftRng;
@@ -26,19 +25,12 @@ use renderer::texture::NoiseTexture;
 use renderer::texture::Texture;
 use renderer::vec3::Vec3;
 
-#[derive(Debug, StructOpt)]
+#[derive(StructOpt)]
 #[structopt(name = "noise_explorer", about = "CLI for exploring Perlin noise")]
 struct Opt {
     /// HTTP listen address
     #[structopt(long = "addr", default_value = "0.0.0.0:8889")]
     pub addr: String,
-
-    /// Width of noise images
-    #[structopt(short = "w", long = "width", default_value = "128")]
-    pub width: u32,
-    /// Height of noise images
-    #[structopt(short = "h", long = "height", default_value = "128")]
-    pub height: u32,
 }
 
 #[derive(Copy, Clone, Debug, Deserialize, PartialEq)]
@@ -63,11 +55,6 @@ struct OptionalParams {
     pixel_scale: f32,
 }
 
-#[derive(Debug, Deserialize)]
-struct NoiseSourceParam {
-    noise_source: NoiseSource,
-}
-
 #[derive(Debug, Deserialize)]
 struct NoiseParams {
     width: u32,
diff --git a/rtiow/noise_explorer_warp/rustfmt.toml b/rtiow/noise_explorer_warp/rustfmt.toml
new file mode 100644
index 0000000..bcd436a
--- /dev/null
+++ b/rtiow/noise_explorer_warp/rustfmt.toml
@@ -0,0 +1,2 @@
+imports_granularity = "Crate"
+format_code_in_doc_comments = true
diff --git a/rtiow/renderer/rustfmt.toml b/rtiow/renderer/rustfmt.toml
new file mode 100644
index 0000000..bcd436a
--- /dev/null
+++ b/rtiow/renderer/rustfmt.toml
@@ -0,0 +1,2 @@
+imports_granularity = "Crate"
+format_code_in_doc_comments = true
diff --git a/rtiow/renderer/src/human.rs b/rtiow/renderer/src/human.rs
index f098b6e..bb9a77d 100644
--- a/rtiow/renderer/src/human.rs
+++ b/rtiow/renderer/src/human.rs
@@ -130,6 +130,12 @@ impl Formatter {
     }
 }
 
+impl Default for Formatter {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Scales {
     /// Instantiates a new `Scales` with SI keys
     pub fn new() -> Self {
@@ -199,7 +205,7 @@ impl Scales {
             }
         }
 
-        return 0.0;
+        0.0
     }
 
     fn to_scaled_value(&self, value: f64) -> ScaledValue {
@@ -221,3 +227,9 @@ impl Scales {
         }
     }
 }
+
+impl Default for Scales {
+    fn default() -> Self {
+        Self::new()
+    }
+}
diff --git a/rtiow/renderer/src/kdtree.rs b/rtiow/renderer/src/kdtree.rs
index 34b4604..82558e2 100644
--- a/rtiow/renderer/src/kdtree.rs
+++ b/rtiow/renderer/src/kdtree.rs
@@ -146,7 +146,7 @@ fn print_tree(f: &mut fmt::Formatter, depth: usize, kdt: &KDTree) -> fmt::Result
 impl fmt::Display for KDTree {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         writeln!(f, "kd-tree")?;
-        print_tree(f, 1, &self)
+        print_tree(f, 1, self)
     }
 }
 impl Hit for KDTree {
diff --git a/rtiow/renderer/src/noise/perlin.rs b/rtiow/renderer/src/noise/perlin.rs
index c010711..036c1d5 100644
--- a/rtiow/renderer/src/noise/perlin.rs
+++ b/rtiow/renderer/src/noise/perlin.rs
@@ -35,7 +35,7 @@ fn perlin_generate_perm<R>(rng: &mut R) -> Vec<usize>
 where
     R: Rng,
 {
-    let mut p: Vec<usize> = (0..256).map(|i| i).collect();
+    let mut p: Vec<usize> = (0..256).collect();
     p.shuffle(rng);
     p
 }
diff --git a/rtiow/renderer/src/output.rs b/rtiow/renderer/src/output.rs
index b21fd30..3af0730 100644
--- a/rtiow/renderer/src/output.rs
+++ b/rtiow/renderer/src/output.rs
@@ -98,7 +98,7 @@ pub fn set_pixel(name: &str, x: usize, y: usize, pixel: Vec3) {
     let (_it, img) = debugger
         .images
         .get_mut(name)
-        .expect(&format!("couldn't find image named '{}'", name));
+        .unwrap_or_else(|| panic!("couldn't find image named '{}'", name));
     let y_inv = img.h - y - 1;
     img.put_pixel(x, y_inv, pixel);
 }
@@ -108,7 +108,7 @@ pub fn set_pixel_grey(name: &str, x: usize, y: usize, grey: f32) {
     let (_it, img) = debugger
         .images
         .get_mut(name)
-        .expect(&format!("couldn't find image named '{}'", name));
+        .unwrap_or_else(|| panic!("couldn't find image named '{}'", name));
     let y_inv = img.h - y - 1;
     img.put_pixel(x, y_inv, [grey, grey, grey].into());
 }
diff --git a/rtiow/renderer/src/renderer.rs b/rtiow/renderer/src/renderer.rs
index 00e97cd..f3d2302 100644
--- a/rtiow/renderer/src/renderer.rs
+++ b/rtiow/renderer/src/renderer.rs
@@ -52,17 +52,17 @@ pub enum Model {
 impl Model {
     pub fn scene(&self, opt: &Opt) -> Scene {
         match self {
-            Model::BVH => scenes::bvh::new(&opt),
-            Model::Bench => scenes::bench::new(&opt),
-            Model::Book => scenes::book::new(&opt),
-            Model::CornellBox => scenes::cornell_box::new(&opt),
-            Model::CornellSmoke => scenes::cornell_smoke::new(&opt),
-            Model::Final => scenes::final_scene::new(&opt),
-            Model::Mandelbrot => scenes::mandelbrot::new(&opt),
-            Model::PerlinDebug => scenes::perlin_debug::new(&opt),
-            Model::Spheramid => scenes::spheramid::new(&opt),
-            Model::Test => scenes::test::new(&opt),
-            Model::Tutorial => scenes::tutorial::new(&opt),
+            Model::BVH => scenes::bvh::new(opt),
+            Model::Bench => scenes::bench::new(opt),
+            Model::Book => scenes::book::new(opt),
+            Model::CornellBox => scenes::cornell_box::new(opt),
+            Model::CornellSmoke => scenes::cornell_smoke::new(opt),
+            Model::Final => scenes::final_scene::new(opt),
+            Model::Mandelbrot => scenes::mandelbrot::new(opt),
+            Model::PerlinDebug => scenes::perlin_debug::new(opt),
+            Model::Spheramid => scenes::spheramid::new(opt),
+            Model::Test => scenes::test::new(opt),
+            Model::Tutorial => scenes::tutorial::new(opt),
         }
     }
 }
@@ -155,7 +155,7 @@ pub fn opt_hash(opt: &Opt) -> String {
         opt.pprof.is_some(),
         opt.model.to_string(),
         opt.use_accel,
-        opt.output.display().to_string().replace("/", "_")
+        opt.output.display().to_string().replace('/', "_")
     )
 }
 
@@ -378,7 +378,7 @@ fn trace_pixel_random(x: usize, y: usize, scene: &Scene) -> (Vec3, usize) {
     )
 }
 
-#[derive(Clone, Copy)]
+#[derive(Clone, Copy, Default)]
 struct RenderStats {
     rays: usize,
     pixels: usize,
@@ -412,12 +412,6 @@ fn progress(
     )
 }
 
-impl Default for RenderStats {
-    fn default() -> Self {
-        RenderStats { rays: 0, pixels: 0 }
-    }
-}
-
 enum Request {
     Pixel { x: usize, y: usize },
     Line { width: usize, y: usize },
diff --git a/rtiow/renderer/src/scenes/book.rs b/rtiow/renderer/src/scenes/book.rs
index 9e591ff..013f809 100644
--- a/rtiow/renderer/src/scenes/book.rs
+++ b/rtiow/renderer/src/scenes/book.rs
@@ -57,7 +57,6 @@ pub fn new(opt: &Opt) -> Scene {
         height: opt.height,
         global_illumination: true,
         env_map: Some(EnvMap::new(skybox)),
-        ..Default::default()
     }
 }
 
diff --git a/rtiow/renderer/src/scenes/spheramid.rs b/rtiow/renderer/src/scenes/spheramid.rs
index 4a8cb2d..cd037de 100644
--- a/rtiow/renderer/src/scenes/spheramid.rs
+++ b/rtiow/renderer/src/scenes/spheramid.rs
@@ -115,6 +115,5 @@ pub fn new(opt: &Opt) -> Scene {
         height: opt.height,
         global_illumination: true,
         env_map: Some(EnvMap::new(skybox)),
-        ..Default::default()
     }
 }
diff --git a/rtiow/renderer/src/texture/mandelbrot.rs b/rtiow/renderer/src/texture/mandelbrot.rs
index e0585f0..dd8d31d 100644
--- a/rtiow/renderer/src/texture/mandelbrot.rs
+++ b/rtiow/renderer/src/texture/mandelbrot.rs
@@ -5,9 +5,7 @@ use rand::Rng;
 use crate::texture::Texture;
 use crate::vec3::Vec3;
 
-#[derive(Debug)]
 pub struct Mandelbrot {
-    scale: f32,
     palette: Vec<Vec3>,
 }
 
@@ -49,7 +47,6 @@ fn generate_palette(num: usize) -> Vec<Vec3> {
 impl Default for Mandelbrot {
     fn default() -> Self {
         Mandelbrot {
-            scale: 2.0,
             palette: generate_palette(10),
         }
     }
diff --git a/rtiow/rustfmt.toml b/rtiow/rustfmt.toml
index 16bdde9..bcd436a 100644
--- a/rtiow/rustfmt.toml
+++ b/rtiow/rustfmt.toml
@@ -1 +1,2 @@
+imports_granularity = "Crate"
 format_code_in_doc_comments = true
diff --git a/rtiow/tracer/rustfmt.toml b/rtiow/tracer/rustfmt.toml
new file mode 100644
index 0000000..bcd436a
--- /dev/null
+++ b/rtiow/tracer/rustfmt.toml
@@ -0,0 +1,2 @@
+imports_granularity = "Crate"
+format_code_in_doc_comments = true
diff --git a/rtiow/tracer/src/main.rs b/rtiow/tracer/src/main.rs
index 3223797..fa39b8a 100644
--- a/rtiow/tracer/src/main.rs
+++ b/rtiow/tracer/src/main.rs
@@ -4,7 +4,6 @@ use std::fs;
 #[cfg(feature = "profile")]
 use cpuprofiler::PROFILER;
 use log::info;
-use stderrlog;
 use structopt::StructOpt;
 
 use renderer::renderer::render;