ft (wip): 10: dielectrics

src/objects/hit.rs

@@ -11,15 +11,17 @@ pub struct Hit {
     p: Vec3,
     n: Vec3,
     mat: Arc<dyn Material>,
+    front_face: bool,
 }
 
 impl Hit {
-    pub fn new(t: f32, p: Vec3, n: Vec3, mat: Arc<dyn Material>) -> Self {
+    pub fn new(t: f32, p: Vec3, n: Vec3, mat: Arc<dyn Material>, front_face: bool) -> Self {
         Self {
             t: t,
             p: p,
-            n: n,
+            n: if front_face { n } else { -n },
             mat: mat,
+            front_face: front_face,
         }
     }
 
@@ -39,6 +41,10 @@ impl Hit {
         self.mat.clone()
     }
 
+    pub fn front_face(&self) -> bool {
+        self.front_face
+    }
+
     pub fn hit_list<T: Hittable>(hittables: &Vec<T>, r: &Ray) -> Option<Hit> {
         let mut closest: Option<Hit> = None;
         for hittable in hittables {