54 lines
1.0 KiB
Rust
54 lines
1.0 KiB
Rust
use crate::{
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aabb::AABB,
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hitable::{Hit, HitRecord},
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ray::Ray,
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vec3::Vec3,
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};
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#[derive(Debug)]
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pub struct Scale<H>
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where
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H: Hit,
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{
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hitable: H,
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scale: Vec3,
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}
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impl<H> Scale<H>
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where
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H: Hit,
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{
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pub fn new<V>(hitable: H, scale: V) -> Scale<H>
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where
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V: Into<Vec3>,
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{
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Scale {
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hitable,
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scale: scale.into(),
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}
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}
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}
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impl<H> Hit for Scale<H>
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where
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H: Hit,
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{
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fn hit(&self, r: Ray, t_min: f32, t_max: f32) -> Option<HitRecord> {
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let moved_r = Ray::new(r.origin / self.scale, r.direction, r.time);
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if let Some(rec) = self.hitable.hit(moved_r, t_min, t_max) {
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return Some(HitRecord {
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p: rec.p * self.scale,
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..rec
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});
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}
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None
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}
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fn bounding_box(&self, t_min: f32, t_max: f32) -> Option<AABB> {
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if let Some(bbox) = self.hitable.bounding_box(t_min, t_max) {
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return Some(AABB::new(bbox.min() * self.scale, bbox.max() * self.scale));
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}
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None
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}
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}
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