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pub mod calculus {
#[derive(Copy, Clone, Debug)]
pub struct Vec3 {
pub x: f32,
pub y: f32,
pub z: f32,
// cached: Vec3Cache,
}
pub type Point3 = Vec3;
impl Vec3 {
pub fn new(x: f32, y: f32, z: f32) -> Self {
Self { x, y, z }
}
pub fn add(&self, other: &Self) -> Self {
Self {
x: self.x + other.x,
y: self.y + other.y,
z: self.z + other.z
}
}
pub fn sub(&self, other: &Self) -> Self {
Self {
x: self.x - other.x,
y: self.y - other.y,
z: self.z - other.z
}
}
pub fn scalar_mul(&self, multiplier: f32) -> Self {
Self {
x: self.x * multiplier,
y: self.y * multiplier,
z: self.z * multiplier,
}
}
pub fn mag_sqr(&self) -> f32 {
self.x * self.x + self.y * self.y + self.z * self.z
}
pub fn mag(&self) -> f32 {
self.mag_sqr().sqrt()
}
pub fn dot_prod(&self, other: &Self) -> f32 {
self.x * other.x + self.y * other.y + self.z * other.z
}
pub fn cross_prod(&self, other: &Self) -> Self {
Self {
x: self.y * other.z - self.z - other.y,
y: self.z * other.x - self.x * other.z,
z: self.x * other.y - self.y * other.x,
}
}
pub fn unit(&self) -> Self {
let mag = self.mag();
Self {
x: self.x / mag,
y: self.y / mag,
z: self.z / mag,
}
}
}
pub struct Ray<'a> {
pub origin: &'a Point3,
pub direction: &'a Vec3,
}
impl<'a> Ray<'a> {
pub fn at(&self, t: f32) -> Point3 {
// Get parametric location
self.origin.add(&self.direction.scalar_mul(t))
}
}
pub fn deg2rad(deg: f32) -> f32 {
deg * std::f32::consts::PI / 180.0
}
}
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