Ray intersection
This commit is contained in:
parent
8c57ade495
commit
85316dd934
7 changed files with 533 additions and 0 deletions
1
assignment-1/.gitignore
vendored
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1
assignment-1/.gitignore
vendored
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@ -0,0 +1 @@
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/target
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330
assignment-1/Cargo.lock
generated
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330
assignment-1/Cargo.lock
generated
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@ -0,0 +1,330 @@
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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"is-terminal",
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"once_cell",
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"errno",
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"io-lifetimes",
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"libc",
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"linux-raw-sys",
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"windows-sys",
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dependencies = [
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"proc-macro2",
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"quote",
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"unicode-ident",
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]
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"winapi-x86_64-pc-windows-gnu",
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]
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[[package]]
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name = "winapi-x86_64-pc-windows-gnu"
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"windows_aarch64_msvc",
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"windows_i686_gnu",
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"windows_i686_msvc",
|
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"windows_x86_64_gnu",
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"windows_x86_64_gnullvm",
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"windows_x86_64_msvc",
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]
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[[package]]
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name = "windows_aarch64_gnullvm"
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name = "windows_i686_gnu"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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name = "windows_x86_64_gnullvm"
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version = "0.42.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "628bfdf232daa22b0d64fdb62b09fcc36bb01f05a3939e20ab73aaf9470d0463"
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|
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[[package]]
|
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name = "windows_x86_64_msvc"
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version = "0.42.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "447660ad36a13288b1db4d4248e857b510e8c3a225c822ba4fb748c0aafecffd"
|
||||
10
assignment-1/Cargo.toml
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10
assignment-1/Cargo.toml
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[package]
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name = "assignment-1"
|
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
|
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|
||||
[dependencies]
|
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anyhow = "1.0.68"
|
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clap = { version = "4.1.4", features = ["derive"] }
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9
assignment-1/src/input_file.rs
Normal file
9
assignment-1/src/input_file.rs
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use std::path::Path;
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use anyhow::Result;
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use crate::scene_data::Scene;
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||||
pub fn parse_input_file(path: impl AsRef<Path>) -> Result<Scene> {
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todo!()
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||||
}
|
||||
39
assignment-1/src/main.rs
Normal file
39
assignment-1/src/main.rs
Normal file
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mod input_file;
|
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mod ray;
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mod scene_data;
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use std::path::PathBuf;
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use anyhow::Result;
|
||||
use clap::Parser;
|
||||
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use crate::input_file::parse_input_file;
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/// Noise image generator.
|
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#[derive(Parser)]
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#[clap(author, version, about, long_about = None)]
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struct Opt {
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/// Path to the input file to use.
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///
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/// The input file should follow this format:
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///
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/// imsize [width] [height]
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///
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/// Where `imsize' is a keyword, and `width' and `height' are integer values
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/// denoting the desired size of the image to be generated.
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#[clap()]
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input_path: PathBuf,
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}
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||||
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||||
fn main() -> Result<()> {
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||||
let opt = Opt::parse();
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||||
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let scene = parse_input_file(&opt.input_path)?;
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||||
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||||
// Loop through every single pixel of the output file
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||||
for (px, py) in (0..scene.image_width).zip(0..scene.image_height) {
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||||
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
70
assignment-1/src/ray.rs
Normal file
70
assignment-1/src/ray.rs
Normal file
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@ -0,0 +1,70 @@
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use crate::scene_data::{Sphere, Vec3};
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||||
|
||||
/// 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