From 952ed8bf810916919e8fddc03957f546311a89aa Mon Sep 17 00:00:00 2001
From: Bill Thiede <git@xinu.tv>
Date: Wed, 21 Jul 2021 19:41:14 -0700
Subject: [PATCH] intersections: implement a PartialEq that handles floats.

---
 rtchallenge/src/intersections.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/rtchallenge/src/intersections.rs b/rtchallenge/src/intersections.rs
index 2802eb4..d0b16d9 100644
--- a/rtchallenge/src/intersections.rs
+++ b/rtchallenge/src/intersections.rs
@@ -7,11 +7,16 @@ use crate::{
     Float, EPSILON,
 };
 
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone)]
 pub struct Intersection<'i> {
     pub t: Float,
     pub object: &'i Shape,
 }
+impl<'i> PartialEq for Intersection<'i> {
+    fn eq(&self, rhs: &Intersection) -> bool {
+        ((self.t - rhs.t).abs() < EPSILON) && (self.object == rhs.object)
+    }
+}
 
 impl<'i> Intersection<'i> {
     /// Create new `Intersection` at the given `t` that hits the given `object`.