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assignment-1/.gitignore
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assignment-1/.gitignore
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/target
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assignment-1/Cargo.lock
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@ -0,0 +1,10 @@
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||||||
|
[package]
|
||||||
|
name = "assignment-1"
|
||||||
|
version = "0.1.0"
|
||||||
|
edition = "2021"
|
||||||
|
|
||||||
|
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
|
||||||
|
|
||||||
|
[dependencies]
|
||||||
|
anyhow = "1.0.68"
|
||||||
|
clap = { version = "4.1.4", features = ["derive"] }
|
||||||
9
assignment-1/src/input_file.rs
Normal file
9
assignment-1/src/input_file.rs
Normal file
|
|
@ -0,0 +1,9 @@
|
||||||
|
use std::path::Path;
|
||||||
|
|
||||||
|
use anyhow::Result;
|
||||||
|
|
||||||
|
use crate::scene_data::Scene;
|
||||||
|
|
||||||
|
pub fn parse_input_file(path: impl AsRef<Path>) -> Result<Scene> {
|
||||||
|
todo!()
|
||||||
|
}
|
||||||
39
assignment-1/src/main.rs
Normal file
39
assignment-1/src/main.rs
Normal file
|
|
@ -0,0 +1,39 @@
|
||||||
|
mod input_file;
|
||||||
|
mod ray;
|
||||||
|
mod scene_data;
|
||||||
|
|
||||||
|
use std::path::PathBuf;
|
||||||
|
|
||||||
|
use anyhow::Result;
|
||||||
|
use clap::Parser;
|
||||||
|
|
||||||
|
use crate::input_file::parse_input_file;
|
||||||
|
|
||||||
|
/// Noise image generator.
|
||||||
|
#[derive(Parser)]
|
||||||
|
#[clap(author, version, about, long_about = None)]
|
||||||
|
struct Opt {
|
||||||
|
/// Path to the input file to use.
|
||||||
|
///
|
||||||
|
/// The input file should follow this format:
|
||||||
|
///
|
||||||
|
/// imsize [width] [height]
|
||||||
|
///
|
||||||
|
/// Where `imsize' is a keyword, and `width' and `height' are integer values
|
||||||
|
/// denoting the desired size of the image to be generated.
|
||||||
|
#[clap()]
|
||||||
|
input_path: PathBuf,
|
||||||
|
}
|
||||||
|
|
||||||
|
fn main() -> Result<()> {
|
||||||
|
let opt = Opt::parse();
|
||||||
|
|
||||||
|
let scene = parse_input_file(&opt.input_path)?;
|
||||||
|
|
||||||
|
// Loop through every single pixel of the output file
|
||||||
|
for (px, py) in (0..scene.image_width).zip(0..scene.image_height) {
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
Ok(())
|
||||||
|
}
|
||||||
70
assignment-1/src/ray.rs
Normal file
70
assignment-1/src/ray.rs
Normal file
|
|
@ -0,0 +1,70 @@
|
||||||
|
use crate::scene_data::{Sphere, Vec3};
|
||||||
|
|
||||||
|
/// A normalized Ray
|
||||||
|
pub struct Ray {
|
||||||
|
origin: Vec3,
|
||||||
|
direction: Vec3,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Ray {
|
||||||
|
pub fn eval(&self, time: f64) -> Vec3 {
|
||||||
|
self.origin + self.direction * time
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Given a ray and a sphere, returns the first point at which this ray intersects the sphere.
|
||||||
|
///
|
||||||
|
/// If there is no intersection point, returns None.
|
||||||
|
pub fn ray_intersection_time(ray: &Ray, sphere: &Sphere) -> Option<f64> {
|
||||||
|
let a =
|
||||||
|
ray.direction.x.powi(2) + ray.direction.y.powi(2) + ray.direction.z.powi(2);
|
||||||
|
let b = 2.0
|
||||||
|
* (ray.direction.x * (ray.origin.x - sphere.center.x)
|
||||||
|
+ ray.direction.y * (ray.origin.y - sphere.center.y)
|
||||||
|
+ ray.direction.z * (ray.origin.z - sphere.center.z));
|
||||||
|
let c = (ray.origin.x - sphere.center.x).powi(2)
|
||||||
|
+ (ray.origin.y - sphere.center.y).powi(2)
|
||||||
|
+ (ray.origin.z - sphere.center.z).powi(2)
|
||||||
|
- sphere.radius.powi(2);
|
||||||
|
let discriminant = b * b - 4.0 * a * c;
|
||||||
|
|
||||||
|
match discriminant {
|
||||||
|
// Discriminant < 0, means the equation has no solutions.
|
||||||
|
d if d < 0.0 => return None,
|
||||||
|
|
||||||
|
// Discriminant == 0
|
||||||
|
d if d == 0.0 => {
|
||||||
|
return Some(-b / (2.0 * a));
|
||||||
|
}
|
||||||
|
|
||||||
|
d if d > 0.0 => {
|
||||||
|
let solution_1 = (-b + discriminant.sqrt()) / (2.0 * a);
|
||||||
|
let solution_2 = (-b - discriminant.sqrt()) / (2.0 * a);
|
||||||
|
|
||||||
|
return Some(solution_1.min(solution_2));
|
||||||
|
}
|
||||||
|
_ => unreachable!("Invalid determinant value: {discriminant}"),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[cfg(test)]
|
||||||
|
mod tests {
|
||||||
|
use crate::scene_data::{Sphere, Vec3};
|
||||||
|
|
||||||
|
use super::{ray_intersection_time, Ray};
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn practice_problem_slide_154() {
|
||||||
|
let ray = Ray {
|
||||||
|
origin: Vec3::new(0.0, 0.0, 0.0),
|
||||||
|
direction: Vec3::new(0.0, 0.0, -1.0),
|
||||||
|
};
|
||||||
|
let sphere = Sphere {
|
||||||
|
center: Vec3::new(0.0, 0.0, -10.0),
|
||||||
|
radius: 4.0,
|
||||||
|
};
|
||||||
|
|
||||||
|
let t = ray_intersection_time(&ray, &sphere).unwrap();
|
||||||
|
assert_eq!(ray.eval(t), Vec3::new(0.0, 0.0, -6.0));
|
||||||
|
}
|
||||||
|
}
|
||||||
74
assignment-1/src/scene_data.rs
Normal file
74
assignment-1/src/scene_data.rs
Normal file
|
|
@ -0,0 +1,74 @@
|
||||||
|
use std::ops::{Add, Mul};
|
||||||
|
|
||||||
|
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
|
||||||
|
pub struct Vec3<T = f64> {
|
||||||
|
pub x: T,
|
||||||
|
pub y: T,
|
||||||
|
pub z: T,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl<T> Vec3<T> {
|
||||||
|
pub fn new(x: T, y: T, z: T) -> Self {
|
||||||
|
Vec3 { x, y, z }
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Vector addition
|
||||||
|
impl<T> Add<Vec3<T>> for Vec3<T>
|
||||||
|
where
|
||||||
|
T: Add<T>,
|
||||||
|
{
|
||||||
|
type Output = Vec3<T::Output>;
|
||||||
|
|
||||||
|
fn add(self, rhs: Vec3<T>) -> Self::Output {
|
||||||
|
Vec3::new(self.x + rhs.x, self.y + rhs.y, self.z + rhs.z)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Scalar multiplication
|
||||||
|
impl<T, U> Mul<U> for Vec3<T>
|
||||||
|
where
|
||||||
|
T: Mul<U, Output = U>,
|
||||||
|
U: Copy,
|
||||||
|
{
|
||||||
|
type Output = Vec3<U>;
|
||||||
|
|
||||||
|
fn mul(self, rhs: U) -> Self::Output {
|
||||||
|
Vec3::new(self.x * rhs, self.y * rhs, self.z * rhs)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub struct Sphere {
|
||||||
|
pub center: Vec3,
|
||||||
|
pub radius: f64,
|
||||||
|
}
|
||||||
|
|
||||||
|
pub enum Object {
|
||||||
|
Sphere(Sphere),
|
||||||
|
Cylinder {
|
||||||
|
center: Vec3,
|
||||||
|
direction: Vec3,
|
||||||
|
radius: f64,
|
||||||
|
length: f64,
|
||||||
|
},
|
||||||
|
}
|
||||||
|
|
||||||
|
pub struct Scene {
|
||||||
|
pub eye_pos: Vec3,
|
||||||
|
pub view_dir: Vec3,
|
||||||
|
pub up_dir: Vec3,
|
||||||
|
|
||||||
|
/// Horizontal field of view (in degrees)
|
||||||
|
pub hfov: f64,
|
||||||
|
|
||||||
|
pub image_width: usize,
|
||||||
|
pub image_height: usize,
|
||||||
|
|
||||||
|
/// Background color
|
||||||
|
pub bkg_color: Vec3,
|
||||||
|
|
||||||
|
/// Material color
|
||||||
|
pub mtl_color: Vec3,
|
||||||
|
|
||||||
|
pub objects: Vec<Object>,
|
||||||
|
}
|
||||||
Loading…
Reference in a new issue