From 5bd104faabbcc44489fd9bbe40e7a214a8ed4a84 Mon Sep 17 00:00:00 2001
From: ramox81 <184937705+ramox81@users.noreply.github.com>
Date: Tue, 18 Aug 2026 16:09:09 +0300
Subject: [PATCH] fix(properties): normalize XLine direction edits

---
 src/entities/ray.rs | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/src/entities/ray.rs b/src/entities/ray.rs
index 47f4e7d06..952c97f2a 100644
--- a/src/entities/ray.rs
+++ b/src/entities/ray.rs
@@ -267,14 +267,17 @@ impl PropertyEditable for XLine {
                     self.set_direction(direction);
                 }
             }
-            "xl_dx" => {
-                self.direction.x = v;
-            }
-            "xl_dy" => {
-                self.direction.y = v;
-            }
-            "xl_dz" => {
-                self.direction.z = v;
+            "xl_dx" | "xl_dy" | "xl_dz" => {
+                let mut direction = self.direction;
+                match field {
+                    "xl_dx" => direction.x = v,
+                    "xl_dy" => direction.y = v,
+                    "xl_dz" => direction.z = v,
+                    _ => unreachable!(),
+                }
+                if direction.length_squared() > 1e-18 {
+                    self.set_direction(direction);
+                }
             }
             _ => {}
         }