ft (wip): random scene generation

src/objects/traits.rs

@@ -5,4 +5,7 @@ use crate::Vec3;
 pub trait Hittable {
     fn hit(&self, r: &Ray) -> Option<Hit>;
     fn normal_at(&self, p: &Vec3) -> Vec3;
+    // fn intersect<H: Hittable>(&self, o: &H) -> bool;
+    fn inside(&self, p: &Vec3) -> bool;
+    fn closest_on_surface(&self, p: &Vec3) -> Vec3;
 }