proper fix for regrouping

src/mesh/api.js

@@ -362,14 +362,13 @@ let tool = {
         }
         api.log.emit(`regrouping ${models.length} model(s)`);
         let bounds = util.bounds(models);
-        let { mid} = bounds;
-        for (let m of models) {
-            m.ungroup();
-        }
-        mesh.api.group.new(models)
-            .centerModels()
-            .position(mid.x, mid.y, mid.z)
-            .select();
+        let { mid } = bounds;
+        Promise.all(models.map(m => m.ungroup())).then(() => {
+            mesh.api.group.new(models)
+                .centerModels()
+                .position(mid.x, mid.y, mid.z)
+                .select();
+        });
     },
 
     analyze(models, opt = { compound: true }) {

src/mesh/build.js

@@ -277,6 +277,7 @@ function ui_build() {
             h.div({ _: "edit", class: "head" }),
             // h.div({ class: "vsep" }),
             h.button({ _: 'duplicate', onclick: tool.duplicate }),
+            h.button({ _: '(re)group', onclick: tool.regroup }),
             h.button({ _: 'merge', onclick: tool.merge }),
             h.button({ _: 'mirror', onclick: tool.mirror }),
             h.button({ _: 'split', onclick: call.edit_split }),

src/mesh/model.js

@@ -185,6 +185,8 @@ mesh.model = class MeshModel extends mesh.object {
         geo._model_invalid = true;
         if (indices) geo.setIndex(new BufferAttribute(indices, 1));
         if (!normals) geo.computeVertexNormals();
+        // allows raycasting to work
+        geo.computeBoundingSphere();
         // persist in db so it can be restored on page load
         mapp.db.space.put(this.id, { file: this.file, mesh: vertices });
         // sync data to worker
@@ -410,15 +412,13 @@ mesh.model = class MeshModel extends mesh.object {
         this.group.remove(this, { free: false });
         this.group = undefined;
 
-        // get current world coordinates
-        // let { mid } = this.mesh.getBoundingBox();
-        // let { geometry } = this.mesh;
-        // move group center back to original center
-        // geometry.moveMesh(-mid.x, -mid.y, -mid.z);
-        // geometry.computeBoundingBox();
-        // this.move(mid.x, mid.y, mid.z);
-
-        return this;
+        return worker.model_duplicate({
+            matrix: this.matrix,
+            id: this.id,
+            opt: {}
+        }).then(data => {
+            this.reload(data);
+        });
     }
 
     // remove model from group and space