Struct obscura::Sphere

pub struct Sphere { /* fields omitted */ }

A sphere primitive.

Methods

impl Sphere

pub fn new(origin: &Vec3, radius: f32) -> Sphere

Create a new Sphere.

Examples

use obscura::{Sphere, Vec3};
 
let origin = Vec3::zero();
let x = Sphere::new(&origin, 1.0);

Trait Implementations

impl Intersect for Sphere

fn intersect(&self, ray: &Ray) -> RayIntersection

Intersect ray with sphere. Return t or t1,t2 where intersection point p = ray.origin + t * ray.direction

Examples

use obscura::{Sphere, Vec3, Ray, RayIntersection, Intersect};
 
let origin = Vec3::zero();
 
let target: Sphere = Sphere::new(
    &Vec3::new(2.0, 0.0, 0.0),
    1.0
);
 
// A ray that intersects the sphere twice.
let ray1: Ray = Ray::new(
    &origin,
    &Vec3::new(1.0, 0.0, 0.0)
);
 
if let RayIntersection::Hit(t1, t2) = Sphere::intersect(&target, &ray1) {
    assert_eq!(t1, 1.0);
    assert_eq!(t2, 3.0);
} else {
    panic!("Oh no!");
}
 
// A ray which never intersects the sphere.
let ray2: Ray = Ray::new(
    &origin,
    &Vec3::new(0.0, 0.0, 1.0)
);
 
let result = Sphere::intersect(&target, &ray2);
assert_eq!(result, RayIntersection::Miss);