From 78ddaff5855bf8446adef9e18eb0d7b7ddcee52a Mon Sep 17 00:00:00 2001
From: lamp
Date: Sun, 5 Mar 2023 21:45:56 +0000
Subject: init

---
 src/hittable/mod.rs | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 src/hittable/mod.rs

(limited to 'src/hittable/mod.rs')

diff --git a/src/hittable/mod.rs b/src/hittable/mod.rs
new file mode 100644
index 0000000..e888c71
--- /dev/null
+++ b/src/hittable/mod.rs
@@ -0,0 +1,76 @@
+pub mod instance;
+mod bvh_node;
+pub use bvh_node::BVHNode;
+mod constant_medium;
+pub use constant_medium::ConstantMedium;
+mod hittable_box;
+pub use hittable_box::HittableBox;
+mod hittable_list;
+pub use hittable_list::HittableList;
+mod xy_rect;
+pub use xy_rect::XYRect;
+mod xz_rect;
+pub use xz_rect::XZRect;
+mod yz_rect;
+pub use yz_rect::YZRect;
+mod sphere;
+pub use sphere::Sphere;
+mod triangle;
+pub use triangle::Triangle;
+mod model;
+pub use model::Model;
+mod aabb;
+
+use std::sync::Arc;
+
+use crate::ray::Ray;
+use crate::vec3::{Point3, Vec3};
+use crate::material::Material;
+use aabb::AABB;
+
+#[derive(Clone)]
+pub struct HitRecord {
+    pub p: Point3,
+    pub normal: Vec3,
+    pub material: Option<Arc<dyn Material>>,
+    pub t: f64,
+    pub u: f64,
+    pub v: f64,
+    pub front_face: bool,
+}
+
+impl HitRecord {
+    pub fn new() -> HitRecord {
+        HitRecord {
+            p: Point3 {
+                x: 0.0,
+                y: 0.0,
+                z: 0.0,
+            },
+            normal: Vec3 {
+                x: 0.0,
+                y: 0.0,
+                z: 0.0,
+            },
+            material: None,
+            t: 0.0,
+            u: 0.0,
+            v: 0.0,
+            front_face: false,
+        }
+    }
+
+    pub fn set_face_normal(&mut self, ray: &Ray, outward_normal: &Vec3) {
+        self.front_face = ray.direction.dot(&outward_normal) < 0.0;
+        self.normal = if self.front_face {
+            outward_normal.clone()
+        } else {
+            -outward_normal
+        };
+    }
+}
+
+pub trait Hittable: Send + Sync {
+    fn hit(&self, ray: &Ray, t_min: f64, t_max: f64) -> Option<HitRecord>;
+    fn bounding_box(&self, time_start: f64, time_end: f64) -> Option<AABB>;
+}
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