Several changes to bounding boxes

For instance removed support for shapes without a bounding box, such as
planes

2 files changed, 59 insertions, 0 deletions

diff --git a/src/world/container/list.rs b/src/world/container/list.rs
new file mode 100644
index 0000000..c8e3fdd
--- /dev/null
+++ b/src/world/container/list.rs
@@ -0,0 +1,56 @@
+use crate::world::{Hittable, Intersection};
+use crate::core::{Bound3f, Ray};
+
+
+pub struct HittableList {
+    elems: Vec<Box<dyn Hittable>>,
+}
+
+impl HittableList {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    pub fn add(&mut self, h: Box<dyn Hittable>) {
+        self.elems.push(h);
+    }
+}
+
+impl Hittable for HittableList {
+    fn intersect(&self, ray: &Ray) -> Option<Intersection> {
+        let mut min: Option<Intersection> = None;
+
+        for e in self.elems.iter() {
+            if let Some(i) = e.intersect(&ray) {
+                match min {
+                    // Do nothing if distance is bigger than min
+                    Some(ref min_i) if min_i.t < i.t => {},
+                    // If no existing min or closer than
+                    _ => min = Some(i),
+                }
+            }
+        }
+
+        min
+    }
+
+    fn bounding_box(&self) -> Bound3f {
+        let mut bound: Bound3f = Bound3f::EMPTY;
+
+        for e in self.elems.iter() {
+            let eb = e.bounding_box();
+            bound = bound.combine(&eb);
+        }
+
+        bound
+    }
+}
+
+impl Default for HittableList {
+    fn default() -> Self {
+        Self {
+            elems: Vec::new(),
+        }
+    }
+}
+
diff --git a/src/world/container/mod.rs b/src/world/container/mod.rs
new file mode 100644
index 0000000..35d4693
--- /dev/null
+++ b/src/world/container/mod.rs
@@ -0,0 +1,3 @@
+mod list;
+
+pub use list::HittableList;