1 files changed, 4 insertions, 4 deletions
diff --git a/src/world/mod.rs b/src/world/mod.rs
index ef239db..f0ba8d2 100644
--- a/src/world/mod.rs
+++ b/src/world/mod.rs
@@ -4,17 +4,17 @@ pub mod shapes;
 mod scene;
 pub use scene::*;
 
-use std::rc::Rc;
+use std::sync::Arc;
 use crate::core::Hittable;
 use crate::material::Material;
 
 pub struct Object {
-    pub shape: Box<dyn Hittable>,
-    pub mat: Rc<dyn Material>,
+    pub shape: Box<dyn Hittable + Sync>,
+    pub mat: Arc<dyn Material + Sync + Send>,
 }
 
 impl Object {
-    pub fn new(mat: Rc<dyn Material>, shape: Box<dyn Hittable>) -> Self {
+    pub fn new(mat: Arc<dyn Material + Sync + Send>, shape: Box<dyn Hittable + Sync>) -> Self {
         Object {
             mat,
             shape,