Move back to dynamic dispatch for object.shape

This will allow more general nesting, with the performance penalty of
dynamic dispatching.
This is implemented with the DynHittable for convenience.

1 files changed, 7 insertions, 1 deletions

diff --git a/src/world/shapes/sphere.rs b/src/world/shapes/sphere.rs
index 1df9c35..fc2cfe2 100644
--- a/src/world/shapes/sphere.rs
+++ b/src/world/shapes/sphere.rs
@@ -3,7 +3,7 @@
 //! Spheres are relatively easy to calculate intersections between
 use crate::{Float, NEAR_ZERO};
 use crate::core::{Ray, Vector3f, Bound3f};
-use crate::world::{Hittable, Intersection};
+use crate::world::{Hittable, DynHittable, Intersection};
 
 pub struct Sphere {
     radius: Float,
@@ -79,6 +79,12 @@ impl Hittable for Sphere {
     }
 }
 
+impl Into<DynHittable> for Sphere {
+    fn into(self) -> DynHittable {
+        DynHittable::new(Box::new(self))
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;