From d737124aa1bff142fdeb554dd7f3a96cd3e5639f Mon Sep 17 00:00:00 2001
From: Michael Zhang <mail@mzhang.io>
Date: Tue, 31 Jan 2023 15:19:34 -0600
Subject: [PATCH] Example 1 works

---
 assignment-1/src/input_file.rs |  1 +
 assignment-1/src/main.rs       | 17 +++++++++--------
 assignment-1/src/ray.rs        |  2 ++
 assignment-1/src/vec3.rs       | 15 +++++++++++++++
 4 files changed, 27 insertions(+), 8 deletions(-)

diff --git a/assignment-1/src/input_file.rs b/assignment-1/src/input_file.rs
index d9ff82c..0597e9c 100644
--- a/assignment-1/src/input_file.rs
+++ b/assignment-1/src/input_file.rs
@@ -7,6 +7,7 @@ use crate::{
   vec3::Vec3,
 };
 
+/// 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();
diff --git a/assignment-1/src/main.rs b/assignment-1/src/main.rs
index 06540f6..31a2354 100644
--- a/assignment-1/src/main.rs
+++ b/assignment-1/src/main.rs
@@ -24,7 +24,7 @@ use crate::scene_data::Object;
 use crate::vec3::Vec3;
 use crate::view::Rect;
 
-const ARBITRARY_D: f64 = 2.0;
+const ARBITRARY_D: f64 = 1.0;
 
 /// Simple raycaster.
 #[derive(Parser)]
@@ -84,18 +84,21 @@ fn main() -> Result<()> {
     lower_right: scene.eye_pos + n * ARBITRARY_D + u * (viewing_width / 2.0) - v * (viewing_height / 2.0),
   };
 
+  println!("Coords: {view_window:?}");
+
   // Translate image pixels to real-world 3d coords
-  let pixel_translation = {
+  let translate_pixel = {
     let dx = view_window.upper_right - view_window.upper_left;
     let pixel_base_x = dx / scene.image_width as f64;
 
     let dy = view_window.lower_left - view_window.upper_left;
     let pixel_base_y = dy / scene.image_height as f64;
+    println!("Base components in 3D space: {pixel_base_x} / {pixel_base_y}");
 
     move |px: usize, py: usize| {
-      let x_component = view_window.upper_left + pixel_base_x * px as f64;
-      let y_component = view_window.upper_left + pixel_base_y * py as f64;
-      x_component + y_component
+      let x_component = pixel_base_x * px as f64;
+      let y_component = pixel_base_y * py as f64;
+      view_window.upper_left + x_component + y_component
     }
   };
 
@@ -108,7 +111,7 @@ fn main() -> Result<()> {
   let pixels = pixels
     .into_par_iter()
     .map(|(px, py)| {
-      let pixel_in_space = pixel_translation(px, py);
+      let pixel_in_space = translate_pixel(px, py);
       let ray = Ray::from_endpoints(scene.eye_pos, pixel_in_space);
 
       let earliest_intersection = scene
@@ -132,8 +135,6 @@ fn main() -> Result<()> {
         None => scene.bkg_color,
       };
 
-      // println!("({px}, {py}): {intersection:?}\t{ray:?} {sphere:?}");
-
       pixel_color.to_pixel()
     })
     .collect::<Vec<_>>();
diff --git a/assignment-1/src/ray.rs b/assignment-1/src/ray.rs
index f2cf85d..fb7023a 100644
--- a/assignment-1/src/ray.rs
+++ b/assignment-1/src/ray.rs
@@ -82,6 +82,7 @@ mod tests {
     let sphere = Sphere {
       center: Vec3::new(0.0, 0.0, -10.0),
       radius: 4.0,
+      material: 0,
     };
 
     let point = ray.intersects_at(&sphere).map(|t| ray.eval(t));
@@ -99,6 +100,7 @@ mod tests {
     let sphere = Sphere {
       center: Vec3::new(0.0, 0.0, -10.0),
       radius: 4.0,
+      material: 0,
     };
 
     // oops! In this case, the ray does not intersect the sphere.
diff --git a/assignment-1/src/vec3.rs b/assignment-1/src/vec3.rs
index 6663dad..7885925 100644
--- a/assignment-1/src/vec3.rs
+++ b/assignment-1/src/vec3.rs
@@ -1,4 +1,5 @@
 use std::ops::{Add, Div, Mul, Sub};
+use std::fmt;
 
 use num::Float;
 
@@ -17,6 +18,20 @@ impl<T> Vec3<T> {
   }
 }
 
+impl<T: fmt::Display> fmt::Display for Vec3<T> {
+  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    f.write_str("(")?;
+    self.x.fmt(f)?;
+    f.write_str(", ")?;
+    self.y.fmt(f)?;
+    f.write_str(", ")?;
+    self.z.fmt(f)?;
+    f.write_str(")")?;
+
+    Ok(())
+  }
+}
+
 impl<T: Float> Vec3<T> {
   /// Cross product on floats
   pub fn cross(u: Self, v: Self) -> Self {