diff --git a/src/kiri-mode/cam/animate2.js b/src/kiri-mode/cam/animate2.js
index f9681c77..734c7f67 100644
--- a/src/kiri-mode/cam/animate2.js
+++ b/src/kiri-mode/cam/animate2.js
@@ -104,8 +104,8 @@ kiri.load(() => {
         geo.setIndex(new THREE.BufferAttribute(ia, 1));
         const mat = new THREE.MeshMatcapMaterial({
             flatShading: true,
-            transparent: false,
-            opacity: 1,
+            transparent: true,
+            opacity: 0.1,
             color: 0x888888,
             side: THREE.DoubleSide
         });
@@ -385,7 +385,7 @@ kiri.load(() => {
 
         stockSlices = [];
         const { x, y, z } = stock;
-        const sliceCount = 20;
+        const sliceCount = 1;
         const sliceWidth = stock.x / sliceCount;
         for (let i=0; i<sliceCount; i++) {
             let xmin = -(x/2) + (i * sliceWidth) + sliceWidth / 2;
diff --git a/src/kiri-mode/cam/client.js b/src/kiri-mode/cam/client.js
index ab72439f..a38381af 100644
--- a/src/kiri-mode/cam/client.js
+++ b/src/kiri-mode/cam/client.js
@@ -65,27 +65,32 @@ CAM.init = function(kiri, api) {
         return API.conf.get().process.camZBottom > 0;
     }
 
-    function setAnimationStyle(settings) {
-        let changed = isIndexed !== settings.process.camStockIndexed;
-        isIndexed = settings.process.camStockIndexed;
+    function setAnimationStyle() {
+        const { camStockIndexed, camStockOn } = current.process;
+        let newIndexed = camStockIndexed && camStockOn;
+        let changed = isIndexed !== newIndexed;
+        isIndexed = newIndexed;
         if (!isIndexed || !isCamMode) {
             for (let widget of API.widgets.all()) {
                 widget.setAxisIndex(0);
             }
         }
-        if (!(isCamMode && changed)) {
+        if (!isCamMode) {
             return;
         }
         if (isIndexed) {
-            settings.process.camZAnchor = "middle";
+            current.process.camZAnchor = "middle";
         }
         animVer = isIndexed ? 1 : 0;
         SPACE.platform.setVisible(!isIndexed);
+        $('cam-index').style.display = isIndexed ? '' : 'none';
+        if (!changed) {
+            return;
+        }
         for (let widget of api.widgets.all()) {
             widget.setIndexed(camStock && isIndexed ? camStock.scale.z : 0);
         }
         api.platform.update_top_z();
-        $('cam-index').style.display = isIndexed ? '' : 'none';
         // add or remove clock op depending on indexing
         const cp = current.process;
         if (!cp.ops) {
@@ -104,7 +109,7 @@ CAM.init = function(kiri, api) {
 
     api.event.on("widget.add", widget => {
         if (isCamMode) {
-            setAnimationStyle(api.conf.get());
+            setAnimationStyle();
         }
     });
 
@@ -173,7 +178,7 @@ CAM.init = function(kiri, api) {
         api.ui.camTabs.marker.style.display = hasTabs ? 'flex' : 'none';
         api.ui.camStock.marker.style.display = proc.camStockOn ? 'flex' : 'none';
         updateStock(settings, 'settings.saved.internal');
-        setAnimationStyle(settings);
+        setAnimationStyle();
         func.opRender();
     });
 
@@ -182,9 +187,11 @@ CAM.init = function(kiri, api) {
         if (!isCamMode) return;
         validateTools(settings.tools);
         restoreTabs(api.widgets.all());
-        setAnimationStyle(settings);
+        setAnimationStyle();
     });
 
+    api.event.on("boolean.click", api.platform.update_top_z);
+
     api.event.on([
         "init-done",
         "view.set",
diff --git a/src/kiri-mode/cam/ops.js b/src/kiri-mode/cam/ops.js
index 0b4f8c0d..42513d2d 100644
--- a/src/kiri-mode/cam/ops.js
+++ b/src/kiri-mode/cam/ops.js
@@ -481,6 +481,7 @@ class OpOutline extends CamOp {
             max: op.top ? zMax + ztOff : undefined
         };
         let indices = slicer.interval(op.down, intopt);
+console.log({slicer, indices, zBottom});
         let trueShadow = process.camTrueShadow === true;
         // shift out first (top-most) slice
         indices.shift();
diff --git a/src/kiri-mode/cam/slice.js b/src/kiri-mode/cam/slice.js
index 7f6d587a..373fe5f6 100644
--- a/src/kiri-mode/cam/slice.js
+++ b/src/kiri-mode/cam/slice.js
@@ -31,14 +31,22 @@ CAM.slice = function(settings, widget, onupdate, ondone) {
         proc = settings.process,
         stock = settings.stock || {},
         hasStock = stock.x && stock.y && stock.z && proc.camStockOn,
+        isIndexed = hasStock && proc.camStockIndexed,
         camOps = widget.camops = [],
         sliceAll = widget.slices = [],
         bounds = widget.getBoundingBox(),
-        wztop = widget.track.top,
-        ztOff = hasStock ? stock.z - wztop : 0,
-        zbOff = hasStock ? wztop - widget.track.box.d : 0,
-        zBottom = proc.camZBottom - zbOff,
-        zMin = Math.max(bounds.min.z, zBottom),
+        track = widget.track,
+        // widget top z as defined by setTopz()
+        wztop = track.top,
+        // distance between top of part and top of stock
+        ztOff = isIndexed ? 0 : (hasStock ? stock.z - wztop : 0),
+        // distance between bottom of part and bottom of stock
+        zbOff = isIndexed ? 0 : (hasStock ? wztop - track.box.d : 0),
+        // defined z bottom offset by distance to stock bottom
+        // keeps the z bottom relative to the part when z align changes
+        zBottom = isIndexed ? bounds.min.z : proc.camZBottom - zbOff,
+        // greater of widget bottom and z bottom
+        zMin = isIndexed ? bounds.min.z : Math.max(bounds.min.z, zBottom),
         zMax = bounds.max.z,
         zThru = proc.camZBottom ? 0 : (proc.camZThru || 0),
         zTop = zMax + ztOff,
@@ -141,7 +149,7 @@ CAM.slice = function(settings, widget, onupdate, ondone) {
     function setAxisIndex(degrees = 0, absolute = true) {
         axisIndex = absolute ? degrees : axisIndex + degrees;
         axisRotation = (Math.PI / 180) * axisIndex;
-        widget.setAxisIndex(-axisIndex);
+        widget.setAxisIndex(isIndexed ? -axisIndex : 0);
     }
 
     function addSlices(slices) {
@@ -232,7 +240,7 @@ CAM.slice = function(settings, widget, onupdate, ondone) {
                 // console.log('reshadow', progress.round(3));
             });
         }
-        tracker.rotation = axisRotation;
+        tracker.rotation = isIndexed ? axisRotation : 0;
         camOps.push(op);
         opSum += weight;
     }
diff --git a/src/kiri/init.js b/src/kiri/init.js
index 3c2219a6..c2213ae4 100644
--- a/src/kiri/init.js
+++ b/src/kiri/init.js
@@ -1918,12 +1918,12 @@ gapp.register("kiri.init", [], (root, exports) => {
             camStockOffset:      uc.newBoolean(LANG.cs_offs_s, onBooleanClick, {title:LANG.cs_offs_l, modes:CAM}),
             camStockClipTo:      uc.newBoolean(LANG.cs_clip_s, onBooleanClick, {title:LANG.cs_clip_l, modes:CAM}),
             camSep:              uc.newBlank({class:"pop-sep"}),
-            camStockIndexed:     uc.newBoolean(LANG.cs_indx_s, onBooleanClick, {title:LANG.cs_indx_l, modes:CAM, show: () => ui.camStockOn.checked}),
+            camStockIndexed:     uc.newBoolean(LANG.cs_indx_s, onBooleanClick, {title:LANG.cs_indx_l, modes:CAM, show:() => ui.camStockOn.checked}),
             camStockOn:          uc.newBoolean(LANG.cs_offe_s, onBooleanClick, {title:LANG.cs_offe_l, modes:CAM}),
 
             camCommon:           uc.newGroup(LANG.cc_menu, null, {modes:CAM}),
-            camZAnchor:          uc.newSelect(LANG.ou_zanc_s, {title: LANG.ou_zanc_l, action:zAnchorSave, modes:CAM, trace:true}, "zanchor"),
-            camSep:              uc.newBlank({class:"pop-sep"}),
+            camZAnchor:          uc.newSelect(LANG.ou_zanc_s, {title: LANG.ou_zanc_l, action:zAnchorSave, modes:CAM, trace:true, show:() => ui.camStockOn.checked && !ui.camStockIndexed.checked}, "zanchor"),
+            camSep:              uc.newBlank({class:"pop-sep", show:() => ui.camStockOn.checked && !ui.camStockIndexed.checked}),
             camZOffset:          uc.newInput(LANG.ou_ztof_s, {title:LANG.ou_ztof_l, convert:uc.toFloat, modes:CAM, units:true}),
             camZBottom:          uc.newInput(LANG.ou_zbot_s, {title:LANG.ou_zbot_l, convert:uc.toFloat, modes:CAM, units:true, trigger: true}),
             camZThru:            uc.newInput(LANG.ou_ztru_s, {title:LANG.ou_ztru_l, convert:uc.toFloat, bound:uc.bound(0.0,100), modes:CAM, units:true, show:() => { return ui.camZBottom.value == 0 }}),
diff --git a/src/kiri/platform.js b/src/kiri/platform.js
index 39421bf2..2adf2058 100644
--- a/src/kiri/platform.js
+++ b/src/kiri/platform.js
@@ -77,7 +77,7 @@ function platformUpdateOrigin() {
     space.platform.setRulers(ruler, ruler, 1 / api.view.unit_scale(), 'X', isBelt ? 'Z' : 'Y');
 
     let { x, y, z } = origin;
-    let oz = process.camStockIndexed ? z / 2 : z;
+    let oz = process.camStockIndexed && process.camStockOn ? z / 2 : z;
     if (controller.showOrigin && MODE !== MODES.SLA) {
         space.platform.setOrigin(x, y, oz, true);
     } else {