fix shadow and lathe progress reporting

src/kiri/mode/cam/op-index.js

@@ -7,10 +7,6 @@ export class OpIndex extends CamOp {
         super(state, op);
     }
 
-    weight() {
-        return 3;
-    }
-
     async slice(progress) {
         let { op, state } = this;
 

src/kiri/mode/cam/op-shadow.js

@@ -21,10 +21,6 @@ class OpShadow extends CamOp {
         super(state, op);
     }
 
-    weight() {
-        return 3;
-    }
-
     async slice(progress) {
         let state = this.state;
 
@@ -68,7 +64,7 @@ class OpShadow extends CamOp {
                     .setLayer("shadow", {line: 0x888800, thin: true })
                     .addPolys(shadow, { thin: true });
             }
-            progress(0.5 + i / tzindex.length, 'shadow');
+            progress(0.5 + (i / tzindex.length) * 0.5, 'shadow');
         }
 
         if (devel && slices.length) {

src/kiri/mode/cam/topo4.js

@@ -203,13 +203,13 @@ export class Topo {
         await gpu.loadTerrain({
             triangles: vertices,
             boundsOverride,
-            onProgress(pct) { onupdate(pct/100) }
+            onProgress: (pct) => onupdate(pct / 1000)
         });
         let output = await gpu.generateToolpaths({
             xStep,
             yStep: 1,
             zFloor: zBottom,
-            onProgress(i,j) { onupdate(i/j) }
+            onProgress: (i,j) => onupdate(0.1 + i / j)
         });
         gpu.terminate();