diff --git a/src/kiri-mode/cam/client.js b/src/kiri-mode/cam/client.js
index 8bbecb2f..1d035f8b 100644
--- a/src/kiri-mode/cam/client.js
+++ b/src/kiri-mode/cam/client.js
@@ -508,7 +508,7 @@
             iw = int.object.widget;
             ic = int.point;
             // only near vertical faces
-            if (Math.abs(n.z) > 0.1) {
+            if (Math.abs(n.z) > 0.3) {
                 return;
             }
             showTab = createTabBox(iw, ic, n);