diff --git a/src/kiri/mode/cam/work/topo3.js b/src/kiri/mode/cam/work/topo3.js
index 3fa93c78..bae90312 100644
--- a/src/kiri/mode/cam/work/topo3.js
+++ b/src/kiri/mode/cam/work/topo3.js
@@ -799,7 +799,7 @@ export class Trace {
                     ok++;
                 }
             }
-            return ok === clips.length;
+            return ok > 0;
         }
 
     }