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/world/shapes/sphere.rs | 98 ----------------------------------------------
 1 file changed, 98 deletions(-)
 delete mode 100644 src/world/shapes/sphere.rs

(limited to 'src/world/shapes/sphere.rs')

diff --git a/src/world/shapes/sphere.rs b/src/world/shapes/sphere.rs
deleted file mode 100644
index 1df9c35..0000000
--- a/src/world/shapes/sphere.rs
+++ /dev/null
@@ -1,98 +0,0 @@
-//! Implements sphere
-//!
-//! Spheres are relatively easy to calculate intersections between
-use crate::{Float, NEAR_ZERO};
-use crate::core::{Ray, Vector3f, Bound3f};
-use crate::world::{Hittable, Intersection};
-
-pub struct Sphere {
-    radius: Float,
-    center: Vector3f,
-}
-
-impl Sphere {
-    pub fn new(radius: Float, center: Vector3f) -> Sphere {
-        Sphere {
-            radius,
-            center,
-        }
-    }
-
-    fn norm_at(&self, point: &Vector3f) -> Vector3f {
-        let mut v = *point - self.center;
-        v /= self.radius;
-        v
-    }
-}
-
-impl Hittable for Sphere {
-    // Implementation from ray tracing in a weekend
-    fn intersect(&self, ray: &Ray) -> Option<Intersection> {
-        let oc = ray.origin - self.center;
-        let a = ray.direction.len_squared();
-        let half_b = oc.dot(&ray.direction);
-        let c = oc.len_squared() - self.radius * self.radius;
-        let disc = half_b*half_b - a*c;
-
-        if disc < 0.0 {
-            None
-        } else {
-            let disc_sqrt = disc.sqrt();
-
-            let mut distance = -half_b - disc_sqrt;
-            if distance <= NEAR_ZERO {
-                distance = -half_b + disc_sqrt;
-            }
-            if distance <= NEAR_ZERO {
-                return None;
-            }
-
-            distance /= a;
-            let w = ray.at(distance);
-            Some(Intersection::new(
-                    self.norm_at(&w),
-                    w,
-                    ray,
-                    distance,
-                    ))
-        }
-
-    }
-
-    /// Box containing the circle
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use rendering::core::Vector3f;
-    /// use rendering::world::{Hittable, shapes::Sphere};
-    ///
-    /// let sph = Sphere::new(1.0, Vector3f::new(0.0));
-    /// let b = sph.bounding_box();
-    ///
-    /// assert!(b.min.x == -1.0 && b.min.y == -1.0 && b.min.z == -1.0);
-    /// assert!(b.max.x == 1.0 && b.max.y == 1.0 && b.max.z == 1.0);
-    fn bounding_box(&self) -> Bound3f {
-        let offset = Vector3f::new(self.radius);
-
-        Bound3f::new(self.center - offset, self.center + offset)
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn sphere_intersect() {
-        let sph = Sphere::new(2.0, Vector3f::new_xyz(2.0, 3.0, 4.0));
-
-        let ray = Ray {
-            origin: Vector3f::new_xyz(1.0, 0.0, 0.0),
-            direction: Vector3f::new_xyz(0.0, 1.0, 1.5).norm(),
-        };
-
-        let dist = sph.intersect(&ray).unwrap();
-        assert!((dist.t - 3.28).abs() < 0.01);
-    }
-}
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