Started materials module.

src/lib.rs

@@ -2,5 +2,6 @@ pub mod camera;
 pub mod colour;
 pub mod image;
 pub mod integrators;
+pub mod materials;
 pub mod raycasting;
 pub mod scene;

src/materials.rs

@@ -0,0 +1,8 @@
+use nalgebra::RealField;
+
+use super::colour::ColourRGB;
+
+pub struct PhongMaterial<T: RealField> {
+    pub colour: ColourRGB<T>,
+    pub smoothness: T,
+}