From 78ddaff5855bf8446adef9e18eb0d7b7ddcee52a Mon Sep 17 00:00:00 2001 From: lamp Date: Sun, 5 Mar 2023 21:45:56 +0000 Subject: init --- src/hittable/instance/moving.rs | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 src/hittable/instance/moving.rs (limited to 'src/hittable/instance/moving.rs') diff --git a/src/hittable/instance/moving.rs b/src/hittable/instance/moving.rs new file mode 100644 index 0000000..418fdbb --- /dev/null +++ b/src/hittable/instance/moving.rs @@ -0,0 +1,40 @@ +use std::sync::Arc; + +use crate::{ray::Ray, vec3::Vec3}; +use crate::hittable::{HitRecord, Hittable, AABB}; + +pub struct Moving { + pub hittable: Arc, + 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 { + 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 { + 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), + })) + } +} -- cgit v1.2.3