1 files changed, 23 insertions, 0 deletions
diff --git a/src/core/hittable.rs b/src/core/hittable.rs
new file mode 100644
index 0000000..20c82f7
--- /dev/null
+++ b/src/core/hittable.rs
@@ -0,0 +1,23 @@
+use crate::core::{Vector3f, Ray};
+
+/// Returns the context of a intersection
+pub struct Intersection {
+    /// Normal vector at intersection
+    pub n: Vector3f,
+    pub p: Vector3f,
+}
+
+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 {
+    fn intersect(&self, ray: &Ray) -> Option<Intersection>;
+}