ft: normal mapping

src/objects/materials/dielectric.rs

@@ -30,7 +30,7 @@ impl Dielectric {
 }
 
 impl Material for Dielectric {
-    fn scatter(&self, hit: &Hit, ray: &Ray) -> Option<(Ray, Colour)> {
+    fn scatter(&self, hit: &Hit, ray: &Ray) -> Option<(Option<Ray>, Colour)> {
         let ri = if hit.front_face() {
             1. / self.refraction_index
         } else {
@@ -51,6 +51,6 @@ impl Material for Dielectric {
         } else {
             unit.refract(hit.n(), ri)
         };
-        Some((Ray::new(*hit.p(), dir), Colour::new(1., 1., 1.)))
+        Some((Some(Ray::new(*hit.p(), dir)), Colour::new(1., 1., 1.)))
     }
 }