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use std::sync::Arc;
use crate::hittable::{HitRecord, Hittable, AABB};
use crate::{ray::Ray, vec3::Vec3};
pub struct Moving {
pub hittable: Arc<dyn Hittable>,
pub offset_start: Vec3,
pub offset_end: Vec3,
pub time_start: f64,
pub time_end: f64,
}
impl Moving {
fn offset_at(&self, time: f64) -> Vec3 {
&self.offset_start
+ ((time - self.time_start) / (self.time_end - self.time_start))
* (&self.offset_end - &self.offset_start)
}
}
impl Hittable for Moving {
fn hit(&self, ray: &Ray, t_min: f64, t_max: f64) -> Option<HitRecord> {
let moved_ray = Ray {
origin: &ray.origin - &self.offset_at(ray.time),
direction: ray.direction.clone(),
time: ray.time,
};
let mut hit_record = self.hittable.hit(&moved_ray, t_min, t_max)?;
hit_record.p += self.offset_at(ray.time).clone();
let normal = hit_record.normal.clone();
hit_record.set_face_normal(&moved_ray, &normal);
Some(hit_record)
}
fn bounding_box(&self, time_start: f64, time_end: f64) -> Option<AABB> {
let output_box = self.hittable.bounding_box(time_start, time_end)?;
Some(
AABB {
minimum: &output_box.minimum + &self.offset_at(time_start),
maximum: &output_box.maximum + &self.offset_at(time_start),
}
.surrounding_box(&AABB {
minimum: &output_box.minimum + &self.offset_at(time_end),
maximum: &output_box.maximum + &self.offset_at(time_end),
}),
)
}
}
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