From 56dc32cce361c1488b504f3dd43aeda5d68ad83e Mon Sep 17 00:00:00 2001
From: Nolan Darilek <nolan@thewordnerd.info>
Date: Tue, 7 Jan 2025 20:52:06 -0500
Subject: [PATCH] Ensure direction is normalized.

---
 src/visibility.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/visibility.rs b/src/visibility.rs
index b3dde56..2e26ca1 100644
--- a/src/visibility.rs
+++ b/src/visibility.rs
@@ -86,7 +86,7 @@ impl Viewshed {
                         } else {
                             let should_push = std::cell::RefCell::new(true);
                             let coord = Vec2::new(coord.x as f32 + 0.5, coord.y as f32 + 0.5);
-                            let dir = Dir2::new_unchecked((coord - *start).normalize());
+                            let dir = Dir2::new_unchecked((coord - *start).normalize_or_zero());
                             // println!("Casting from {coord} to {dir:?}");
                             spatial_query.cast_ray_predicate(
                                 *start,