diff --git a/geometry/mesh.rs b/geometry/mesh.rs
index d54e77d..2807d0b 100644
--- a/geometry/mesh.rs
+++ b/geometry/mesh.rs
@@ -6,5 +6,5 @@ pub struct Mesh {
     pub position: Vec3, // Unimplemented
     // rotation: Quaternion,
     pub scale: f64, // Unimplemented
-    pub triangles: Vec<Box<Prim:Send+Share>>
+    pub triangles: Vec<Box<Prim+Send+Share>>
 }
diff --git a/geometry/prims/plane.rs b/geometry/prims/plane.rs
index e39e2c3..b06e6d8 100644
--- a/geometry/prims/plane.rs
+++ b/geometry/prims/plane.rs
@@ -9,7 +9,7 @@ pub struct Plane {
     pub b: f64,
     pub c: f64,
     pub d: f64,
-    pub material: Box<Material:Send+Share>
+    pub material: Box<Material+Send+Share>
 }
 
 impl Prim for Plane {
diff --git a/geometry/prims/sphere.rs b/geometry/prims/sphere.rs
index 33fa40c..bab2b6e 100644
--- a/geometry/prims/sphere.rs
+++ b/geometry/prims/sphere.rs
@@ -7,7 +7,7 @@ use vec3::Vec3;
 pub struct Sphere {
     pub center: Vec3,
     pub radius: f64,
-    pub material: Box<Material:Send+Share>
+    pub material: Box<Material+Send+Share>
 }
 
 impl Prim for Sphere {
diff --git a/geometry/prims/triangle.rs b/geometry/prims/triangle.rs
index f602edd..8e7c81a 100644
--- a/geometry/prims/triangle.rs
+++ b/geometry/prims/triangle.rs
@@ -11,13 +11,13 @@ pub struct Triangle {
     pub n0: Vec3,
     pub n1: Vec3,
     pub n2: Vec3,
-    pub material: Box<Material:Send+Share>
+    pub material: Box<Material+Send+Share>
 }
 
 impl Triangle {
     /// All three normals at vertices are perpendicular to the triangle plane
     #[allow(dead_code)]
-    pub fn auto_normal(v0: Vec3, v1: Vec3, v2: Vec3, material: Box<Material:Send+Share>) -> Triangle {
+    pub fn auto_normal(v0: Vec3, v1: Vec3, v2: Vec3, material: Box<Material+Send+Share>) -> Triangle {
         // let n = (v1 - v0).cross(&(v2 - v0));
         let n = (v1 - v0).cross(&(v2 - v0));
         Triangle {
diff --git a/my_scene.rs b/my_scene.rs
index c0ddc69..2508762 100644
--- a/my_scene.rs
+++ b/my_scene.rs
@@ -22,7 +22,7 @@ pub fn get_camera(image_width: int, image_height: int) -> Camera {
 
 #[allow(dead_code)]
 pub fn get_scene() -> Scene {
-    let mut lights: Vec<Box<Light:Send+Share>> = Vec::new();
+    let mut lights: Vec<Box<Light+Send+Share>> = Vec::new();
     // lights.push(box PointLight {position: Vec3 {x: 50.0, y: 20.0, z: 50.0}, color: Vec3::one()});
     lights.push(box SphereLight {position: Vec3 {x: 50.0, y: 80.0, z: 50.0}, color: Vec3::one(), radius: 10.0});
 
@@ -33,7 +33,7 @@ pub fn get_scene() -> Scene {
     let shiny   = PhongMaterial {k_a: 0.0, k_d: 0.5, k_s: 1.0, k_sg: 1.0, k_tg: 0.0, shininess: 50.0, ior: 1.0, ambient: Vec3::one(), diffuse: Vec3 {x: 1.0, y: 1.0, z: 1.0}, specular: Vec3::one(), transmission: Vec3::zero()};
     let refract = PhongMaterial {k_a: 0.0, k_d: 0.0, k_s: 1.0, k_sg: 0.0, k_tg: 1.0, shininess: 40.0, ior: 3.0, ambient: Vec3::one(), diffuse: Vec3 {x: 1.0, y: 1.0, z: 1.0}, specular: Vec3::one(), transmission: Vec3 {x: 0.8, y: 0.8, z: 0.8}};
 
-    let mut prims: Vec<Box<Prim:Send+Share>> = Vec::new();
+    let mut prims: Vec<Box<Prim+Send+Share>> = Vec::new();
     prims.push(box Plane {a: 0.0,  b:  0.0, c: 1.0, d: 0.0,   material: box grey  }); // Ahead
     prims.push(box Plane {a: 0.0,  b: -1.0, c: 0.0, d: 100.0, material: box grey  }); // Bottom
     prims.push(box Plane {a: 0.0,  b:  1.0, c: 0.0, d: 0.0,   material: box grey  }); // Top
@@ -66,7 +66,7 @@ pub fn get_bunny_camera(image_width: int, image_height: int) -> Camera {
 
 #[allow(dead_code)]
 pub fn get_bunny_scene() -> Scene {
-    let mut lights: Vec<Box<Light:Send+Share>> = Vec::new();
+    let mut lights: Vec<Box<Light+Send+Share>> = Vec::new();
     lights.push(box SphereLight {position: Vec3 {x: 200.0, y: -200.0, z: 100.0}, color: Vec3::one(), radius: 40.0});
     lights.push(box SphereLight {position: Vec3 {x: -95.0, y: 20.0, z: 170.0}, color: Vec3{x: 0.5, y: 0.5, z: 0.3}, radius: 15.0});
 
@@ -74,7 +74,7 @@ pub fn get_bunny_scene() -> Scene {
     let green = CookTorranceMaterial {k_a: 0.0, k_d: 0.5, k_s: 0.5, k_sg: 0.2, k_tg: 0.0, gauss_constant: 50.0, roughness: 0.3, ior: 1.5, ambient: Vec3::one(), diffuse: Vec3 {x: 0.2, y: 0.7, z: 0.2}, specular: Vec3::one(), transmission: Vec3::zero()};
     let shiny = CookTorranceMaterial {k_a: 0.0, k_d: 0.2, k_s: 0.5, k_sg: 0.8, k_tg: 0.0, gauss_constant: 50.0, roughness: 0.1, ior: 1.5, ambient: Vec3::one(), diffuse: Vec3 {x: 0.9, y: 0.9, z: 0.1}, specular: Vec3 {x: 0.9, y: 0.9, z: 0.1}, transmission: Vec3::zero()};
 
-    let mut prims: Vec<Box<Prim:Send+Share>> = Vec::new();
+    let mut prims: Vec<Box<Prim+Send+Share>> = Vec::new();
     prims.push(box Plane {a: 0.0, b: 0.0, c: 1.0, d: -10.0, material: box green});
     prims.push(box Sphere {center: Vec3 {x: -75.0, y: 60.0, z: 50.0}, radius: 40.0, material: box shiny});
     prims.push(box Sphere {center: Vec3 {x: -75.0, y: 60.0, z: 140.0}, radius: 40.0, material: box shiny});
diff --git a/scene/scene.rs b/scene/scene.rs
index 75b931e..d668d32 100644
--- a/scene/scene.rs
+++ b/scene/scene.rs
@@ -3,7 +3,7 @@ use light::Light;
 use vec3::Vec3;
 
 pub struct Scene {
-    pub lights: Vec<Box<Light:Send+Share>>,
-    pub prims: Vec<Box<Prim:Send+Share>>,
+    pub lights: Vec<Box<Light+Send+Share>>,
+    pub prims: Vec<Box<Prim+Send+Share>>,
     pub background: Vec3
 }
diff --git a/util/import.rs b/util/import.rs
index 0aebc90..26a2048 100644
--- a/util/import.rs
+++ b/util/import.rs
@@ -13,7 +13,7 @@ pub fn from_obj(position: Vec3, scale: f64, material: CookTorranceMaterial /*Box
 
     let mut vertices: Vec<Vec3> = Vec::new();
     let mut normals: Vec<Vec3> = Vec::new();
-    let mut triangles: Vec<Box<Prim:Send+Share>> = Vec::new();
+    let mut triangles: Vec<Box<Prim+Send+Share>> = Vec::new();
 
     for line_iter in file.lines() {
         let line: String = match line_iter {