From f4208ad1e8bdf4eee09780cc5ea84977d615fdd1 Mon Sep 17 00:00:00 2001
From: Haoyu Qiu <timothyqiu32@gmail.com>
Date: Sat, 31 Jul 2021 02:25:05 +0800
Subject: [PATCH] Do nothing when dragging CSGBox handle perpendicular to the
 camera

(cherry picked from commit 0f1e107ede5085aff017e8069697463598c5b512)
---
 modules/csg/csg_gizmos.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/modules/csg/csg_gizmos.cpp b/modules/csg/csg_gizmos.cpp
index 4b17b17f60d..f70abb2265d 100644
--- a/modules/csg/csg_gizmos.cpp
+++ b/modules/csg/csg_gizmos.cpp
@@ -139,6 +139,12 @@ void CSGShapeSpatialGizmoPlugin::set_handle(EditorSpatialGizmo *p_gizmo, int p_i
 		Vector3 ra, rb;
 		Geometry::get_closest_points_between_segments(Vector3(), axis * 4096, sg[0], sg[1], ra, rb);
 		float d = ra[p_idx];
+
+		if (Math::is_nan(d)) {
+			// The handle is perpendicular to the camera.
+			return;
+		}
+
 		if (SpatialEditor::get_singleton()->is_snap_enabled()) {
 			d = Math::stepify(d, SpatialEditor::get_singleton()->get_translate_snap());
 		}