94 lines
2.5 KiB
Rust
94 lines
2.5 KiB
Rust
use super::{Arc, Color, Material, Metal, Point3, Ray, Vec3};
|
|
|
|
pub struct HitRecord {
|
|
pub p: Point3,
|
|
pub normal: Vec3,
|
|
pub mat_ptr: Arc<dyn Material>,
|
|
pub t: f64,
|
|
pub front_face: bool,
|
|
}
|
|
|
|
pub struct Sphere {
|
|
center: Point3,
|
|
radius: f64,
|
|
pub mat_ptr: Arc<dyn Material>,
|
|
}
|
|
|
|
pub trait Hittable: Sync + Send {
|
|
fn hit(&self, r: &Ray, t_min: f64, t_max: f64, rec: &mut HitRecord) -> bool;
|
|
}
|
|
|
|
impl HitRecord {
|
|
fn set_face_normal(&mut self, r: &Ray, outward_normal: Vec3) {
|
|
self.front_face = Vec3::dot(r.direction(), outward_normal) < 0.0;
|
|
if self.front_face {
|
|
self.normal = outward_normal;
|
|
} else {
|
|
self.normal = (-1.0) * outward_normal;
|
|
}
|
|
}
|
|
|
|
pub fn new(p: Point3, normal: Vec3, m: Arc<dyn Material>, t: f64, front_face: bool) -> Self {
|
|
HitRecord {
|
|
p: p,
|
|
normal: normal,
|
|
mat_ptr: m,
|
|
t: t,
|
|
front_face: front_face,
|
|
}
|
|
}
|
|
|
|
pub fn empty() -> Self {
|
|
Self::new(
|
|
Point3::null(),
|
|
Vec3::null(),
|
|
Arc::new(Metal::new(&Color::null(), 0.0)),
|
|
0.0,
|
|
false,
|
|
)
|
|
}
|
|
}
|
|
|
|
impl Sphere {
|
|
pub fn new(cen: Point3, r: f64, m: Arc<dyn Material>) -> Self {
|
|
Sphere {
|
|
center: cen,
|
|
radius: r,
|
|
mat_ptr: m,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Hittable for Sphere {
|
|
fn hit(&self, r: &Ray, t_min: f64, t_max: f64, rec: &mut HitRecord) -> bool {
|
|
let oc = r.origin() - self.center;
|
|
let a = r.direction().length_squared(); // gleiches Ergebnis wie Skalarprodukt
|
|
let half_b = Vec3::dot(oc, r.direction());
|
|
let c = oc.length_squared() - self.radius * self.radius;
|
|
|
|
let discriminant = half_b * half_b - a * c;
|
|
if discriminant < 0.0 {
|
|
return false;
|
|
}
|
|
|
|
let sqrtd = discriminant.sqrt();
|
|
|
|
let mut root = (-half_b - sqrtd) / a;
|
|
let normal = (r.at(root) - self.center) / self.radius;
|
|
if root < t_min || t_max < root || Vec3::dot(normal, r.direction()) > 0.0 {
|
|
root = (-half_b + sqrtd) / a;
|
|
let normal = (r.at(root) - self.center) / self.radius;
|
|
if root < t_min || t_max < root || Vec3::dot(normal, r.direction()) > 0.0 {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
rec.t = root;
|
|
rec.p = r.at(rec.t);
|
|
let outward_normal = (rec.p - self.center) / self.radius;
|
|
rec.set_face_normal(r, outward_normal);
|
|
rec.mat_ptr = self.mat_ptr.clone();
|
|
|
|
return true;
|
|
}
|
|
}
|