latest changes

src/hittable.rs

@@ -0,0 +1,29 @@
+use crate::ray::*;
+use crate::vec3::*;
+
+#[derive(Clone)]
+pub struct HitRecord {
+    pub p: Point3,
+    pub normal: Vec3,
+    pub t: f64,
+    pub front_face: bool,
+}
+
+impl HitRecord {
+    pub fn new_empty() -> Self {
+        HitRecord { p: Point3::new(0.0, 0.0, 0.0), normal: Vec3::new(0.0, 0.0, 0.0), t: 0.0, front_face: false }
+    }
+
+    pub fn set_face_normal(&mut self, r: &Ray, outward_normal: &Vec3) {
+        self.front_face = r.direction().dot(outward_normal) < 0.0;
+        self.normal = if self.front_face {
+            *outward_normal
+        } else {
+            *outward_normal * -1.0
+        }
+    }
+}
+
+pub trait Hittable {
+    fn hit(&self, r: &Ray, t_min: f64, t_max: f64, rec: &mut HitRecord) -> bool;
+}