diff --git a/src/kiri/core/conf.js b/src/kiri/core/conf.js
index 117559f7..4df29f63 100644
--- a/src/kiri/core/conf.js
+++ b/src/kiri/core/conf.js
@@ -426,7 +426,8 @@ export const conf = {
                 camAreaSpindle: 1000,
                 camAreaTool: 1000,
                 camAreaMode: "clear",
-                camAreaOffset: "none",
+                camAreaTrace: "none",
+                camAreaSurface: "linear",
                 camAreaOver: 0.4,
                 camAreaDown: 1,
                 camAreaSpeed: 1000,
diff --git a/src/kiri/core/consts.js b/src/kiri/core/consts.js
index 1278f527..ca4ec075 100644
--- a/src/kiri/core/consts.js
+++ b/src/kiri/core/consts.js
@@ -126,6 +126,10 @@ const LISTS = {
         { name: "clear" },
         { name: "trace" },
         { name: "surface" }
+    ],
+    surftyp: [
+        { name: "linear" },
+        { name: "offset" },
     ]
 };
 
diff --git a/src/kiri/mode/cam/cl-ops.js b/src/kiri/mode/cam/cl-ops.js
index 52c855e6..fbef8211 100644
--- a/src/kiri/mode/cam/cl-ops.js
+++ b/src/kiri/mode/cam/cl-ops.js
@@ -669,7 +669,8 @@ export function createPopOps() {
         spindle: 'camAreaSpindle',
         tool: 'camAreaTool',
         mode: 'camAreaMode',
-        offset: 'camAreaOffset',
+        tr_off: 'camAreaTrace',
+        sr_typ: 'camAreaSurface',
         over: 'camAreaOver',
         down: 'camAreaDown',
         rate: 'camAreaSpeed',
@@ -685,7 +686,8 @@ export function createPopOps() {
     }).inputs = {
         tool: UC.newSelect(LANG.cc_tool, {}, "tools"),
         mode: UC.newSelect(LANG.mo_menu, {}, "opmode"),
-        offset: UC.newSelect(LANG.cc_offs_s, { title: LANG.cc_offs_l, show: isTrace }, "traceoff"),
+        tr_off: UC.newSelect(LANG.cc_offs_s, { title: LANG.cc_offs_l, show: isTrace }, "traceoff"),
+        sr_typ: UC.newSelect("pattern", { title: "pattern", show: isSurface }, "surftyp"),
         sep: UC.newBlank({ class: "pop-sep" }),
         menu: UC.newRow([
             UC.newButton("edge", traceAdd),
@@ -694,7 +696,7 @@ export function createPopOps() {
         outline: UC.newBoolean(LANG.cp_outl_s, undefined, { title: LANG.cp_outl_l, show: () => isClear() || isTrace() }),
         expand: UC.newInput(LANG.cp_xpnd_s, { title: LANG.cp_xpnd_l, convert: toFloat, units }),
         sep: UC.newBlank({ class: "pop-sep" }),
-        over: UC.newInput(LANG.cc_sovr_s, { title: LANG.cc_sovr_l, convert: toFloat, bound: UC.bound(0.001, 100.0), units, show: isClear }),
+        over: UC.newInput(LANG.cc_sovr_s, { title: LANG.cc_sovr_l, convert: toFloat, bound: UC.bound(0.001, 100.0), units, show: () => isClear() || isSurface() }),
         down: UC.newInput(LANG.cc_sdwn_s, { title: LANG.cc_sdwn_l, convert: toFloat, bound: UC.bound(0, 100.0), units, show: () => isClear() || isTrace() }),
         sep: UC.newBlank({ class: "pop-sep", show: isSurface }),
         refine: UC.newInput(LANG.cp_refi_s, { title: LANG.cp_refi_l, convert: toInt, show: isSurface }),
diff --git a/src/kiri/mode/cam/op-area.js b/src/kiri/mode/cam/op-area.js
index 7a78644e..fe6ff427 100644
--- a/src/kiri/mode/cam/op-area.js
+++ b/src/kiri/mode/cam/op-area.js
@@ -20,7 +20,7 @@ class OpArea extends CamOp {
     async slice(progress) {
         const pocket = this;
         let { op, state } = this;
-        let { tool, mode, down, over, follow, expand, offset, outline, smooth, tolerance } = op;
+        let { tool, mode, down, over, follow, expand, tr_off, sr_typ, outline, refine, smooth, tolerance } = op;
         let { ov_topz, ov_botz, ov_conv } = op;
         let { settings, widget, tabs, color } = state;
         let { addSlices, setToolDiam, cutTabs, healPolys, shadowAt, workarea } = state;
@@ -166,10 +166,10 @@ class OpArea extends CamOp {
                     let slice = newLayer();
                     let layers = slice.output();
                     let outs = [];
-                    if (offset === 'none') {
+                    if (tr_off === 'none') {
                         outs = [ area.clone().setZ(z) ];
                     } else {
-                        POLY.offset([ area ], offset === 'inside' ? [ -toolDiam / 2 ] : [ toolDiam / 2 ], {
+                        POLY.offset([ area ], tr_off === 'inside' ? [ -toolDiam / 2 ] : [ toolDiam / 2 ], {
                             count: 1, outs, flat: true, z, minArea: 0
                         });
                     }
@@ -191,7 +191,12 @@ class OpArea extends CamOp {
                 progress(proc, 'trace');
             } else
             if (mode === 'surface') {
+                if (sr_typ === 'linear') {
 
+                } else
+                if (sr_typ === 'offset') {
+
+                }
             }
         }