From 44b46187a045035daf54f5ace55fb95d8cc775cf Mon Sep 17 00:00:00 2001
From: Bill Thiede <git@xinu.tv>
Date: Wed, 21 Jul 2021 20:45:33 -0700
Subject: [PATCH] world: add builder pattern.

---
 rtchallenge/src/world.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/rtchallenge/src/world.rs b/rtchallenge/src/world.rs
index 7aecc54..5db015e 100644
--- a/rtchallenge/src/world.rs
+++ b/rtchallenge/src/world.rs
@@ -1,3 +1,5 @@
+use derive_builder::Builder;
+
 use crate::{
     intersections::{prepare_computations, Intersections, PrecomputedData},
     lights::PointLight,
@@ -20,7 +22,8 @@ use crate::{
 /// assert_eq!(w.lights.len(), 0);
 /// ```
 
-#[derive(Clone, Debug, Default)]
+#[derive(Builder, Clone, Debug, Default)]
+#[builder(default)]
 pub struct World {
     pub lights: Vec<PointLight>,
     pub objects: Vec<Shape>,