From ff8d36336ef51a8c53528db913e5cee5605a5e22 Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Mon, 13 May 2019 09:13:31 +0800
Subject: [PATCH] add more check

---
 src/m_rotation.scad | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/m_rotation.scad b/src/m_rotation.scad
index 22fbad82..2f2ff0dd 100644
--- a/src/m_rotation.scad
+++ b/src/m_rotation.scad
@@ -78,7 +78,7 @@ function _xyz_rotation(a) =
     _m_zRotation(ang[2]) * _m_yRotation(ang[1]) * _m_xRotation(ang[0]);
 
 function m_rotation(a, v) = 
-    a == 0 ? [
+    (a == 0 || a == [0, 0, 0] || a == [0] || a == [0, 0]) ? [
         [1, 0, 0, 0],
         [0, 1, 0, 0],
         [0, 0, 1, 0],