From 3ef8f4d918406eec6bdc29e0ebd883fabfac9b2e Mon Sep 17 00:00:00 2001
From: Julian T <julian@jtle.dk>
Date: Thu, 5 Aug 2021 15:44:40 +0200
Subject: Add picture for c5505ab84820248c6dba35fc06aef9e0ced183de

---
 src/material/dielectric.rs | 56 ----------------------------------------------
 1 file changed, 56 deletions(-)
 delete mode 100644 src/material/dielectric.rs

(limited to 'src/material/dielectric.rs')

diff --git a/src/material/dielectric.rs b/src/material/dielectric.rs
deleted file mode 100644
index c8dc279..0000000
--- a/src/material/dielectric.rs
+++ /dev/null
@@ -1,56 +0,0 @@
-use super::Material;
-use crate::core::{min, Vector3f, Spectrum, Ray};
-use crate::world::Intersection;
-use crate::sample::Sampler;
-use crate::Float;
-use crate::material::reflectant::reflect;
-
-pub struct Dielectric {
-    ratio: Float,
-}
-
-// Implementation from RTIOW
-fn refract(v: Vector3f, n: Vector3f, r_ratio: Float, cos_theta: Float) -> Vector3f {
-    let r_perp = (v + n * cos_theta) * r_ratio;
-    let r_parallel = n * (-(1.0 - r_perp.len_squared()).abs().sqrt());
-
-    r_perp + r_parallel
-}
-
-// Schlick Approximation, explained in RTIOW
-fn fresnel(cos: Float, ratio: Float) -> Float {
-    let mut r0 = (1.0-ratio) / (1.0+ratio);
-    r0 = r0 * r0;
-
-    r0 + (1.0-r0)*(1.0-cos).powi(5)
-}
-
-impl Dielectric {
-    pub fn new(ratio: Float) -> Self {
-        Self { ratio }
-    }
-}
-
-impl Material for Dielectric {
-    // Implementation from RTIOW
-    fn scatter(&self, ray: &Ray, i: &Intersection, sampler: &mut dyn Sampler) -> Option<(Spectrum, Ray)> {
-        let ratio = if i.front {1.0/self.ratio} else {self.ratio};
-
-        let ray_dir = ray.direction.norm();
-        let cos_theta = min((-ray_dir).dot(&i.n), 1.0);
-        let sin_theta = (1.0 - cos_theta*cos_theta).sqrt();
-
-        // Test if it is possible for the ray the retract or if it must reflect.
-        let cannot_refract = (ratio * sin_theta) > 1.0;
-        let direction = if cannot_refract || (fresnel(cos_theta, ratio) > sampler.get_sample()) {
-            reflect(ray_dir, i.n)
-        } else {
-            refract(ray_dir, i.n, ratio, cos_theta)
-        };
-
-        Some((
-                Spectrum::WHITE,
-                Ray::new(i.p, direction),
-             ))
-    }
-}
-- 
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