rtiow: stub triangles shape created from STLs.

rtiow/renderer/src/aabb.rs

@@ -2,7 +2,7 @@ use std::fmt;
 
 use crate::{ray::Ray, vec3::Vec3};
 
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Copy, Clone, PartialEq)]
 pub struct AABB {
     bounds: [Vec3; 2],
 }