diff --git a/src/kiri-mode/cam/slice.js b/src/kiri-mode/cam/slice.js
index cf77f89a..0db00e4e 100644
--- a/src/kiri-mode/cam/slice.js
+++ b/src/kiri-mode/cam/slice.js
@@ -253,6 +253,7 @@ CAM.slice = function(settings, widget, onupdate, ondone) {
             new CAM.OPS.shadow(state, { type: "shadow", silent: true }).slice(progress => {
                 // console.log('reshadow', progress.round(3));
             });
+            widget.topo = undefined;
         }
         camOps.push(op);
         opSum += weight;
diff --git a/src/kiri-mode/cam/topo.js b/src/kiri-mode/cam/topo.js
index 6640a364..8779fdff 100644
--- a/src/kiri-mode/cam/topo.js
+++ b/src/kiri-mode/cam/topo.js
@@ -409,7 +409,8 @@ class Topo {
             ondone(newslices);
         }
 
-        let slicer = new kiri.cam_slicer(widget.getPoints(), {
+        let points = base.verticesToPoints(widget.getGeoVertices(true, true));
+        let slicer = new kiri.cam_slicer(points, {
             swapX: true, emptyok: true, notopok: true
         });
         let sindex = slicer.interval(resolution);