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use std::sync::Arc;
use crate::{
hittable::{HitRecord, Hittable, AABB},
ray::Ray,
vec3::Vec3,
};
pub struct Translate {
pub hittable: Arc<dyn Hittable>,
pub offset: Vec3,
}
impl Hittable for Translate {
fn hit(&self, ray: &Ray, t_min: f64, t_max: f64) -> Option<HitRecord> {
let moved_ray = Ray {
origin: &ray.origin - &self.offset,
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.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,
maximum: &output_box.maximum + &self.offset,
})
}
}
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