remove zlist() in mesh, test structuredClone for object.clone

notes.md

@@ -2,6 +2,9 @@
 
 ## `C` cosmetic, `F` functional, `P` performance, `B` bug fix
 
+* `F` experiment with structuredClone(), SharedArrayBuffer, createImageBitmap()
+* `F` test #private fields, array.at() for negative indices
+
 # Kiri:Moto
 
 * `B` origin (and bed size) bug (Onshape?) when switching device modes

src/add/array.js

@@ -218,7 +218,8 @@ String.prototype.reverse = function() {
 };
 
 Object.clone = function(o) {
-    return o ? JSON.parse(JSON.stringify(o)) : o;
+    return structuredClone(o);
+    // return o ? JSON.parse(JSON.stringify(o)) : o;
 };
 
 Object.toArray = function(o) {

src/mesh/model.js

@@ -449,15 +449,6 @@ mesh.model = class MeshModel extends mesh.object {
         });
     }
 
-    zlist(round = 2) {
-        return new Promise((resolve,reject) => {
-            let { id, matrix } = this;
-            worker.model_zlist({id, matrix, round}).then(data => {
-                resolve(data);
-            });
-        });
-    }
-
     // release from a group but remain in memory and storage
     // so it can be re-assigned to another group
     ungroup() {

src/mesh/work.js

@@ -172,19 +172,6 @@ let model = {
         return subs.toFloat32();
     },
 
-    // used to generate a list for split snapping
-    zlist(data) {
-        let { id, matrix, round } = data;
-        let zlist = {};
-        let pos = translate_encode(id, matrix);
-        for (let i=0, l=pos.length; i<l; ) {
-            let v1 = new Vector3(pos[i++], pos[i++], pos[i++]);
-            let z = v1.z.round(round || 2);
-            zlist[z] = '';
-        }
-        return Object.keys(zlist).map(v => parseFloat(v));
-    },
-
     // split a model along an axis at a given point
     // return two arrays of vertices for each resulting object
     split(data) {