diff --git a/assignment-1b/examples/Hw1bSample1.txt b/assignment-1b/examples/Hw1bSample1.txt
index dc42708..75ea085 100755
--- a/assignment-1b/examples/Hw1bSample1.txt
+++ b/assignment-1b/examples/Hw1bSample1.txt
@@ -4,11 +4,15 @@ viewdir 0 0.1 -1
 hfov 90
 updir 0 1 0
 bkgcolor 0.1 0.1 0.1
+
 light -1 -1 -1 0 0.9 0.5 0.05
+
 mtlcolor 0 1 0 1 1 1 0.6 0.2 0.2 10
 sphere 0 1.5 -4 1
+
 mtlcolor 0 1 0 1 1 1 0.1 0.8 0.2 10
 sphere -1.275 -0.75 -4 1
+
 mtlcolor 0 1 0 1 1 1 0.1 0.2 0.8 10
 sphere 1.275 -0.75 -4 1
 
diff --git a/assignment-1b/src/input_file.rs b/assignment-1b/src/input_file.rs
deleted file mode 100644
index 9b9dfcf..000000000
--- a/assignment-1b/src/input_file.rs
+++ /dev/null
@@ -1,138 +0,0 @@
-use std::{fs::File, io::Read, path::Path};
-
-use anyhow::Result;
-use nalgebra::Vector3;
-
-use crate::{
-  image::Color,
-  scene::{
-    cylinder::Cylinder,
-    data::{Light, LightKind, Material, Object, Scene},
-    sphere::Sphere,
-  },
-};
-
-/// Parse the input file into a scene
-pub fn parse_input_file(path: impl AsRef<Path>) -> Result<Scene> {
-  let contents = {
-    let mut contents = String::new();
-    let mut file = File::open(path.as_ref())?;
-    file.read_to_string(&mut contents)?;
-    contents
-  };
-
-  let mut scene = Scene::default();
-  let mut material_color = None;
-
-  for line in contents.lines() {
-    let mut parts = line.split_whitespace();
-    let keyword = match parts.next() {
-      Some(v) => v,
-      None => continue,
-    };
-
-    if keyword == "imsize" {
-      let parts = parts
-        .map(|s| s.parse::<usize>().map_err(|e| e.into()))
-        .collect::<Result<Vec<_>>>()?;
-      if let [width, height] = parts[..] {
-        scene.image_width = width;
-        scene.image_height = height;
-      }
-    } else if keyword == "projection" {
-      if let Some("parallel") = parts.next() {
-        scene.parallel_projection = true;
-      }
-    }
-    // Do float parsing instead
-    else {
-      let parts = parts
-        .map(|s| s.parse::<f64>().map_err(|e| e.into()))
-        .collect::<Result<Vec<_>>>()?;
-
-      let read_vec3 = |start: usize| {
-        if parts.len() < start + 3 {
-          bail!("Vec3 requires 3 components.");
-        }
-        Ok(Vector3::new(
-          parts[start],
-          parts[start + 1],
-          parts[start + 2],
-        ))
-      };
-
-      match keyword {
-        "eye" => scene.eye_pos = read_vec3(0)?,
-        "viewdir" => scene.view_dir = read_vec3(0)?,
-        "updir" => scene.up_dir = read_vec3(0)?,
-
-        "hfov" => scene.hfov = parts[0],
-        "bkgcolor" => scene.bkg_color = read_vec3(0)?,
-
-        "light" => {
-          let kind = match parts[3] as usize {
-            0 => LightKind::Directional {
-              direction: read_vec3(0)?,
-            },
-            1 => LightKind::Point {
-              location: read_vec3(0)?,
-            },
-            _ => bail!("Invalid w"),
-          };
-          let light = Light {
-            kind,
-            color: read_vec3(4)?,
-          };
-          scene.lights.push(light);
-        }
-
-        // mtlcolor Odr Odg Odb Osr Osg Osb ka kd ks n
-        "mtlcolor" => {
-          let diffuse_color = read_vec3(0)?;
-          let specular_color = read_vec3(3)?;
-
-          let material = Material {
-            diffuse_color,
-            specular_color,
-            k_a: parts[6],
-            k_d: parts[7],
-            k_s: parts[8],
-            exponent: parts[9],
-          };
-
-          let idx = scene.materials.len();
-          material_color = Some(idx);
-          scene.materials.push(material);
-        }
-
-        "sphere" => scene.objects.push(Object {
-          kind: Box::new(Sphere {
-            center: read_vec3(0)?,
-            radius: parts[3],
-          }),
-          material: match material_color {
-            Some(v) => v,
-            None => bail!("Each sphere must be preceded by a `mtlcolor` line"),
-          },
-        }),
-
-        "cylinder" => scene.objects.push(Object {
-          kind: Box::new(Cylinder {
-            center: read_vec3(0)?,
-            direction: read_vec3(3)?,
-            radius: parts[6],
-            length: parts[7],
-          }),
-          material: match material_color {
-            Some(v) => v,
-            None => bail!("Each sphere must be preceded by a `mtlcolor` line"),
-          },
-        }),
-
-        _ => bail!("Unknown keyword {keyword}"),
-      }
-    }
-  }
-
-  Ok(scene)
-}
diff --git a/assignment-1b/src/main.rs b/assignment-1b/src/main.rs
index 65c0cea..ba32daa 100644
--- a/assignment-1b/src/main.rs
+++ b/assignment-1b/src/main.rs
@@ -4,7 +4,6 @@ extern crate anyhow;
 extern crate derivative;
 
 mod image;
-mod input_file;
 mod ray;
 mod scene;
 mod utils;
@@ -16,9 +15,9 @@ use anyhow::Result;
 use clap::Parser;
 use rayon::prelude::{IntoParallelIterator, ParallelIterator};
 use scene::data::ObjectKind;
+use scene::Scene;
 
 use crate::image::Image;
-use crate::input_file::parse_input_file;
 use crate::ray::Ray;
 
 /// Simple raycaster.
@@ -49,7 +48,7 @@ fn main() -> Result<()> {
     .output_path
     .unwrap_or_else(|| opt.input_path.with_extension("ppm"));
 
-  let mut scene = parse_input_file(&opt.input_path)?;
+  let mut scene = Scene::from_input_file(&opt.input_path)?;
   let distance = opt.distance;
 
   if opt.force_parallel {
diff --git a/assignment-1b/src/scene/data.rs b/assignment-1b/src/scene/data.rs
index f053285..154a1f2 100644
--- a/assignment-1b/src/scene/data.rs
+++ b/assignment-1b/src/scene/data.rs
@@ -7,6 +7,8 @@ use ordered_float::NotNan;
 use crate::image::Color;
 use crate::ray::Ray;
 
+use super::Scene;
+
 pub trait ObjectKind: Debug + Send + Sync {
   /// Determine where the ray intersects this object, returning the earliest
   /// time this happens. Returns None if no intersection occurs.
@@ -64,24 +66,12 @@ pub struct Light {
 }
 
 #[derive(Debug, Default)]
-pub struct Scene {
-  pub eye_pos: Vector3<f64>,
-  pub view_dir: Vector3<f64>,
-  pub up_dir: Vector3<f64>,
-
-  /// Horizontal field of view (in degrees)
-  pub hfov: f64,
-  pub parallel_projection: bool,
-
-  pub image_width: usize,
-  pub image_height: usize,
-
-  /// Background color
-  pub bkg_color: Color,
-
-  pub materials: Vec<Material>,
-  pub lights: Vec<Light>,
-  pub objects: Vec<Object>,
+pub struct DepthCueing {
+  color: Color,
+  a_max: f64,
+  a_min: f64,
+  dist_max: f64,
+  dist_min: f64,
 }
 
 /// Information about an intersection
@@ -130,6 +120,7 @@ impl Scene {
 
     let ambient_component = material.k_a * material.diffuse_color;
 
+    // Diffuse and specular lighting for each separate light
     let diffuse_and_specular: Vector3<f64> = self
       .lights
       .iter()
diff --git a/assignment-1b/src/scene/input_file.rs b/assignment-1b/src/scene/input_file.rs
new file mode 100644
index 000000000..a1c7226
--- /dev/null
+++ b/assignment-1b/src/scene/input_file.rs
@@ -0,0 +1,142 @@
+use std::{fs::File, io::Read, path::Path};
+
+use anyhow::Result;
+use nalgebra::Vector3;
+
+use crate::scene::{
+  cylinder::Cylinder,
+  data::{Light, LightKind, Material, Object},
+  sphere::Sphere,
+  Scene,
+};
+
+impl Scene {
+  /// Parse the input file into a scene
+  pub fn from_input_file(path: impl AsRef<Path>) -> Result<Self> {
+    let contents = {
+      let mut contents = String::new();
+      let mut file = File::open(path.as_ref())?;
+      file.read_to_string(&mut contents)?;
+      contents
+    };
+
+    let mut scene = Scene::default();
+    let mut material_color = None;
+
+    for line in contents.lines() {
+      let mut parts = line.split_whitespace();
+      let keyword = match parts.next() {
+        Some(v) => v,
+        None => continue,
+      };
+
+      if keyword == "imsize" {
+        let parts = parts
+          .map(|s| s.parse::<usize>().map_err(|e| e.into()))
+          .collect::<Result<Vec<_>>>()?;
+        if let [width, height] = parts[..] {
+          scene.image_width = width;
+          scene.image_height = height;
+        }
+      } else if keyword == "projection" {
+        if let Some("parallel") = parts.next() {
+          scene.parallel_projection = true;
+        }
+      }
+      // Do float parsing instead
+      else {
+        let parts = parts
+          .map(|s| s.parse::<f64>().map_err(|e| e.into()))
+          .collect::<Result<Vec<_>>>()?;
+
+        let read_vec3 = |start: usize| {
+          if parts.len() < start + 3 {
+            bail!("Vec3 requires 3 components.");
+          }
+          Ok(Vector3::new(
+            parts[start],
+            parts[start + 1],
+            parts[start + 2],
+          ))
+        };
+
+        match keyword {
+          "eye" => scene.eye_pos = read_vec3(0)?,
+          "viewdir" => scene.view_dir = read_vec3(0)?,
+          "updir" => scene.up_dir = read_vec3(0)?,
+
+          "hfov" => scene.hfov = parts[0],
+          "bkgcolor" => scene.bkg_color = read_vec3(0)?,
+
+          "light" => {
+            let kind = match parts[3] as usize {
+              0 => LightKind::Directional {
+                direction: read_vec3(0)?,
+              },
+              1 => LightKind::Point {
+                location: read_vec3(0)?,
+              },
+              _ => bail!("Invalid w"),
+            };
+            let light = Light {
+              kind,
+              color: read_vec3(4)?,
+            };
+            scene.lights.push(light);
+          }
+
+          // mtlcolor Odr Odg Odb Osr Osg Osb ka kd ks n
+          "mtlcolor" => {
+            let diffuse_color = read_vec3(0)?;
+            let specular_color = read_vec3(3)?;
+
+            let material = Material {
+              diffuse_color,
+              specular_color,
+              k_a: parts[6],
+              k_d: parts[7],
+              k_s: parts[8],
+              exponent: parts[9],
+            };
+
+            let idx = scene.materials.len();
+            material_color = Some(idx);
+            scene.materials.push(material);
+          }
+
+          "sphere" => scene.objects.push(Object {
+            kind: Box::new(Sphere {
+              center: read_vec3(0)?,
+              radius: parts[3],
+            }),
+            material: match material_color {
+              Some(v) => v,
+              None => {
+                bail!("Each sphere must be preceded by a `mtlcolor` line")
+              }
+            },
+          }),
+
+          "cylinder" => scene.objects.push(Object {
+            kind: Box::new(Cylinder {
+              center: read_vec3(0)?,
+              direction: read_vec3(3)?,
+              radius: parts[6],
+              length: parts[7],
+            }),
+            material: match material_color {
+              Some(v) => v,
+              None => {
+                bail!("Each sphere must be preceded by a `mtlcolor` line")
+              }
+            },
+          }),
+
+          _ => bail!("Unknown keyword {keyword}"),
+        }
+      }
+    }
+
+    Ok(scene)
+  }
+}
diff --git a/assignment-1b/src/scene/mod.rs b/assignment-1b/src/scene/mod.rs
index e0465c9..3405b15 100644
--- a/assignment-1b/src/scene/mod.rs
+++ b/assignment-1b/src/scene/mod.rs
@@ -1,3 +1,32 @@
-pub mod data;
-pub mod sphere;
 pub mod cylinder;
+pub mod data;
+pub mod input_file;
+pub mod sphere;
+
+use nalgebra::Vector3;
+
+use crate::image::Color;
+
+use self::data::{DepthCueing, Light, Material, Object};
+
+#[derive(Debug, Default)]
+pub struct Scene {
+  pub eye_pos: Vector3<f64>,
+  pub view_dir: Vector3<f64>,
+  pub up_dir: Vector3<f64>,
+
+  /// Horizontal field of view (in degrees)
+  pub hfov: f64,
+  pub parallel_projection: bool,
+
+  pub image_width: usize,
+  pub image_height: usize,
+
+  /// Background color
+  pub bkg_color: Color,
+  pub depth_cueing: DepthCueing,
+
+  pub materials: Vec<Material>,
+  pub lights: Vec<Light>,
+  pub objects: Vec<Object>,
+}