diff --git a/src/kiri/mode/cam/topo3.js b/src/kiri/mode/cam/topo3.js
index 262fa309..37120093 100644
--- a/src/kiri/mode/cam/topo3.js
+++ b/src/kiri/mode/cam/topo3.js
@@ -108,7 +108,6 @@ export class Topo {
         }
 
         if (webGPU) {
-            console.log({ tool });
             // invert tool Z offset for gpu code
             let toolBounds = new THREE.Box3();
             let toolPos = tool.profile.slice();
@@ -155,6 +154,7 @@ export class Topo {
                 onProgress(pct) { console.log({ pct }); onupdate(pct/100, 100) }
             });
             let { numScanlines, pointsPerLine, pathData } = output;
+            let { positions, gridWidth } = terrainData;
             let xmult = xStep * resolution;
             let ymult = yStep * resolution;
             let xoff = wbounds.min.x;
@@ -179,7 +179,7 @@ export class Topo {
                 let skip = 0;
                 let lp;
                 for (let p of points) {
-                    if (inside && positions[p.ty * terrain.gridWidth + p.tx] < zBottom - epsilon) {
+                    if (inside && positions[p.ty * gridWidth + p.tx] < zBottom - epsilon) {
                         if (poly.length > 1) {
                             lines.push(poly);
                             poly = newPolygon().setOpen();
diff --git a/src/kiri/mode/cam/topo4.js b/src/kiri/mode/cam/topo4.js
index 86cf2a5d..1fd15de6 100644
--- a/src/kiri/mode/cam/topo4.js
+++ b/src/kiri/mode/cam/topo4.js
@@ -71,8 +71,9 @@ export class Topo {
 
         onupdate(0, "lathe");
 
+        const parts = webGPU ? [ 0.8, 0.2 ] : [ 0.25, 0.75 ];
         const range = this.range = { min: Infinity, max: -Infinity };
-        const slices = this.sliced = await this.slice(scale(onupdate, 0.25, 0));
+        const slices = this.sliced = await this.slice(scale(onupdate, parts[0], 0));
 
         for (let slice of slices) {
             range.min = Math.min(range.min, slice.z);
@@ -82,7 +83,7 @@ export class Topo {
                 .addPolys(slice.topPolys());
         }
 
-        const lathe = await this.lathe(scale(onupdate, 0.75, 0.25));
+        const lathe = await this.lathe(scale(onupdate, parts[1], parts[0]));
 
         onupdate(1, "lathe");
         ondone(lathe);
@@ -191,7 +192,8 @@ export class Topo {
         boundsOverride.max.x -= offEnd * unit;
         let terrainData = await gpu.rasterizeModel({
             triangles: vertices,
-            boundsOverride
+            boundsOverride,
+            onProgress(pct) { onupdate(pct/100) }
         });
         let output = await gpu.generateToolpaths({
             terrainData,
diff --git a/src/kiri/run/worker.js b/src/kiri/run/worker.js
index 27e8b570..f5ebdf5e 100644
--- a/src/kiri/run/worker.js
+++ b/src/kiri/run/worker.js
@@ -69,7 +69,6 @@ self.uuid = ((Math.random() * Date.now()) | 0).toString(36);
  * @returns {RasterPath}
  */
 self.get_raster_gpu = async function({ mode, resolution, rotationStep }) {
-    console.log({ mode, resolution, rotationStep });
     let gpu = new RasterPath({
         mode,
         resolution,