1 files changed, 52 insertions, 0 deletions
diff --git a/src/hittable/hittable_list.rs b/src/hittable/hittable_list.rs
new file mode 100644
index 0000000..735509c
--- /dev/null
+++ b/src/hittable/hittable_list.rs
@@ -0,0 +1,52 @@
+use std::sync::Arc;
+
+use crate::hittable::{HitRecord, Hittable, AABB};
+use crate::ray::Ray;
+
+pub struct HittableList {
+    pub objects: Vec<Arc<dyn Hittable>>,
+}
+
+impl HittableList {
+    pub fn new() -> HittableList {
+        HittableList {
+            objects: Vec::new(),
+        }
+    }
+
+    pub fn clear(&mut self) {
+        self.objects.clear();
+    }
+
+    pub fn add(&mut self, object: Arc<dyn Hittable>) {
+        self.objects.push(object);
+    }
+}
+
+impl Hittable for HittableList {
+    fn hit(&self, ray: &Ray, t_min: f64, t_max: f64) -> Option<HitRecord> {
+        let mut record = None;
+        let mut closest_so_far = t_max;
+
+        for object in &self.objects {
+            let temp_rec = object.hit(ray, t_min, closest_so_far);
+            if let Some(hit_record) = &temp_rec {
+                closest_so_far = hit_record.t;
+                record = temp_rec;
+            }
+        }
+        record
+    }
+
+    fn bounding_box(&self, time_start: f64, time_end: f64) -> Option<AABB> {
+        let mut output_box: Option<AABB> = None;
+        for object in &self.objects {
+            let temp_box = object.bounding_box(time_start, time_end)?;
+            output_box = match output_box {
+                Some(aabb) => Some(aabb.surrounding_box(&temp_box)),
+                None => Some(temp_box.clone()),
+            };
+        }
+        output_box
+    }
+}