raytracing.rs

struct Ray {
    origin: Vec3,
    direction: Vec3,
}

impl Ray {
    fn point_at_parameter(&self, t: f32) -> Vec3 {
        self.origin + t * self.direction
    }
}

struct HitRecord {
    t: f32,
    p: Vec3,
    normal: Vec3,
}

trait Hitable {
    fn hit(&self, ray: &Ray, t_min: f32, t_max: f32) -> Option<HitRecord>;
}

struct Sphere {
    center: Vec3,
    radius: f32,
}

impl Hitable for Sphere {
    fn hit(&self, ray: &Ray, t_min: f32, t_max: f32) -> Option<HitRecord> {
        let oc = ray.origin - self.center;
        let a = dot(&ray.direction, &ray.direction);
        let b = dot(&oc, &ray.direction);
        let