From 3deef4d969dd50ddf540b80fe43ef16af5c17169 Mon Sep 17 00:00:00 2001
From: Nat Lasseter <user@4574.co.uk>
Date: Mon, 24 Jun 2024 22:51:51 +0100
Subject: Chapter 11

---
 hittable.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'hittable.go')

diff --git a/hittable.go b/hittable.go
index 42599ab..ac5e996 100644
--- a/hittable.go
+++ b/hittable.go
@@ -11,12 +11,14 @@ type HitRecord struct {
   P Vec3
   N Vec3
   T float64
+  F bool
   Mat Material
 }
 
 func (rec *HitRecord) SetFaceNormal(r Ray, out_n Vec3) {
-  if r.Direction.Dot(out_n) < 0 {
-    rec.N = out_n
+  rec.F = r.Direction.Dot(out_n) < 0;
+  if rec.F {
+    rec.N = out_n;
   } else {
     rec.N = out_n.Neg();
   }
-- 
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