From da1c3949a449f3fafe579c62ff6b14ffd993a197 Mon Sep 17 00:00:00 2001
From: Julian T <julian@jtle.dk>
Date: Sun, 21 Feb 2021 18:01:56 +0100
Subject: Add 3d bounding box and merged SceneIntersection and Intersection

---
 src/world/hittable.rs | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 src/world/hittable.rs

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

diff --git a/src/world/hittable.rs b/src/world/hittable.rs
new file mode 100644
index 0000000..720a019
--- /dev/null
+++ b/src/world/hittable.rs
@@ -0,0 +1,33 @@
+use crate::core::{Vector3f, Bound3f, Ray};
+use crate::Float;
+use crate::material::Material;
+
+/// Returns the context of a intersection
+pub struct Intersection<'a> {
+    /// Normal vector at intersection
+    pub n: Vector3f,
+    pub p: Vector3f,
+    pub t: Float,
+    pub m: Option<&'a dyn Material>,
+}
+
+impl Intersection<'_> {
+    pub fn norm_against_ray(&self, r: &Ray) -> Vector3f {
+        if self.n.dot(&r.direction) < 0.0 {
+            self.n
+        } else {
+            -self.n
+        }
+    }
+}
+
+/// Defines a common trait for objects in the scene
+pub trait Hittable: Sync + Send {
+    /// Returns the intersection with ray
+    fn intersect(&self, ray: &Ray) -> Option<Intersection>;
+
+    /// Returns the axis alligned bounding box containing self
+    fn bounding_box(&self) -> Option<Bound3f> {
+        None
+    }
+}
-- 
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