diff --git a/src/kiri-mode/cam/client.js b/src/kiri-mode/cam/client.js
index 7b476dfb..a678f038 100644
--- a/src/kiri-mode/cam/client.js
+++ b/src/kiri-mode/cam/client.js
@@ -1700,13 +1700,11 @@ CAM.init = function(kiri, api) {
         dogbone: 'camTraceDogbone',
         revbone: 'camTraceDogbone',
         merge:   'camTraceMerge',
-        select:  'camTraceMode',
         ov_topz: 0,
         ov_botz: 0,
         ov_conv: '~camConventional',
     }).inputs = {
         tool:     UC.newSelect(LANG.cc_tool, {}, "tools"),
-        select:   UC.newSelect(LANG.cc_sele_s, {title:LANG.cc_sele_l}, "select"),
         mode:     UC.newSelect(LANG.cu_type_s, {title:LANG.cu_type_l}, "trace"),
         offset:   UC.newSelect(LANG.cc_offs_s, {title: LANG.cc_offs_l, show:() => (poppedRec.mode === 'follow')}, "traceoff"),
         sep:      UC.newBlank({class:"pop-sep"}),
diff --git a/src/kiri-mode/cam/ops.js b/src/kiri-mode/cam/ops.js
index ab54b4f7..b025431d 100644
--- a/src/kiri-mode/cam/ops.js
+++ b/src/kiri-mode/cam/ops.js
@@ -1043,7 +1043,6 @@ class OpTrace extends CamOp {
                 .setLayer("trace follow", {line: color}, false)
                 .addPolys(slice.camLines)
         }
-
         function clearZnew(polys, z, down) {
             if (down) {
                 // adjust step down to a value <= down that
@@ -1095,30 +1094,6 @@ class OpTrace extends CamOp {
                 }
             }
         }
-
-        function clearZ(polys, z, down) {
-            let zs = down ? base.util.lerp(zTop, z, down) : [ z ];
-            let nested = POLY.nest(polys);
-            for (let poly of nested) {
-                for (let z of zs) {
-                    let slice = newSliceOut(z);
-                    slice.camTrace = { tool, rate, plunge };
-                    POLY.offset([ poly ], [ -toolDiam/2, -toolOver ], {
-                        count:999, outs: slice.camLines = [], flat:true, z,
-                        minArea: 0
-                    });
-                    if (tabs) {
-                        slice.camLines = cutTabs(tabs, POLY.flatten(slice.camLines, null, true), z);
-                    } else {
-                        slice.camLines = POLY.flatten(slice.camLines, null, true);
-                    }
-                    POLY.setWinding(slice.camLines, cutdir, false);
-                    slice.output()
-                        .setLayer("trace clear", {line: color}, false)
-                        .addPolys(slice.camLines)
-                }
-            }
-        }
         function similar(v1, v2, epsilon = 0.01) {
             return Math.abs(v1-v2) <= epsilon;
         }