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use cgmath::{Vector3, dot};
use crate::material::Material;
use crate::ray::Ray;
pub struct Hit<'a> {
pub t: f64,
pub p: Vector3<f64>,
pub normal: Vector3<f64>,
pub front_face: bool,
pub material: &'a (dyn Material)
}
impl<'a> Hit<'a> {
pub fn new(ray: &Ray, t: f64, out_normal: Vector3<f64>, material: &'a(dyn Material)) -> Hit<'a> {
let front_face = dot(ray.dir, out_normal) < 0.0;
let normal = if front_face { out_normal } else { -out_normal };
let p = ray.at(t);
Hit { t, p, normal, front_face, material }
}
}
pub trait Hittable {
fn is_hit(&self, ray: &Ray, t_min: f64, t_max: f64) -> Option<Hit>;
}
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