From 0f1e107ede5085aff017e8069697463598c5b512 Mon Sep 17 00:00:00 2001
From: Haoyu Qiu <timothyqiu32@gmail.com>
Date: Sat, 31 Jul 2021 02:25:05 +0800
Subject: Do nothing when dragging CSGBox handle perpendicular to the camera

---
 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 fc84c029ec..42f8b9f163 100644
--- a/modules/csg/csg_gizmos.cpp
+++ b/modules/csg/csg_gizmos.cpp
@@ -135,6 +135,12 @@ void CSGShape3DGizmoPlugin::set_handle(const EditorNode3DGizmo *p_gizmo, int p_i
 		Vector3 ra, rb;
 		Geometry3D::get_closest_points_between_segments(Vector3(), axis * 4096, sg[0], sg[1], ra, rb);
 		float d = ra[p_id];
+
+		if (Math::is_nan(d)) {
+			// The handle is perpendicular to the camera.
+			return;
+		}
+
 		if (Node3DEditor::get_singleton()->is_snap_enabled()) {
 			d = Math::snapped(d, Node3DEditor::get_singleton()->get_translate_snap());
 		}
-- 
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