3 files changed, 7 insertions, 4 deletions
diff --git a/src/material/lambertian.rs b/src/material/lambertian.rs
index 8ef5e50..3df6522 100644
--- a/src/material/lambertian.rs
+++ b/src/material/lambertian.rs
@@ -1,5 +1,6 @@
 use super::Material;
-use crate::core::{Intersection, Ray, Spectrum};
+use crate::core::{Ray, Spectrum};
+use crate::world::Intersection;
 use crate::sample::Sampler;
 
 use std::rc::Rc;
diff --git a/src/material/mod.rs b/src/material/mod.rs
index c939385..7f920e2 100644
--- a/src/material/mod.rs
+++ b/src/material/mod.rs
@@ -1,4 +1,5 @@
-use crate::core::{Ray, Intersection, Spectrum};
+use crate::core::{Ray, Spectrum};
+use crate::world::Intersection;
 use crate::sample::Sampler;
 
 mod lambertian;
@@ -7,6 +8,6 @@ mod reflectant;
 pub use lambertian::Lambertian;
 pub use reflectant::Reflectant;
 
-pub trait Material {
+pub trait Material: Sync + Send {
     fn scatter(&self, ray: &Ray, i: &Intersection, sampler: &mut dyn Sampler) -> Option<(Spectrum, Ray)>;
 }
diff --git a/src/material/reflectant.rs b/src/material/reflectant.rs
index f4b110c..dea7aca 100644
--- a/src/material/reflectant.rs
+++ b/src/material/reflectant.rs
@@ -1,5 +1,6 @@
 use crate::Float;
-use crate::core::{Ray, Intersection, Spectrum, Vector3f};
+use crate::core::{Ray, Spectrum, Vector3f};
+use crate::world::Intersection;
 use super::Material;
 use crate::sample::Sampler;