ft (wip): 10: dielectrics

src/objects/materials/dielectric.rs

@@ -0,0 +1,30 @@
+use crate::{
+    objects::{hit::Hit, materials::traits::Material},
+    ray::Ray,
+    vec3::Colour,
+};
+
+pub struct Dielectric {
+    refraction_index: f32,
+}
+
+impl Dielectric {
+    pub fn new(refraction_index: f32) -> Self {
+        Self {
+            refraction_index: refraction_index,
+        }
+    }
+}
+
+impl Material for Dielectric {
+    fn scatter(&self, hit: &Hit, ray: &Ray) -> Option<(Ray, Colour)> {
+        let ri = if hit.front_face() {
+            1. / self.refraction_index
+        } else {
+            self.refraction_index
+        };
+        let unit = ray.dir().get_unit();
+        let refr = unit.refract(hit.n(), ri);
+        Some((Ray::new(*hit.p(), refr), Colour::new(1., 1., 1.)))
+    }
+}