fixes in add.three and rename group's 3js object to group3

src/add/three.js

@@ -32,7 +32,7 @@
         },
         mid: {
             get: function() {
-                return this.dim.clone().mutiplyScalar(0.5).add(this.min);
+                return this.dim.clone().multiplyScalar(0.5).add(this.min);
             }
         }
     });
@@ -84,9 +84,9 @@
         let gap = this.attributes.position,
             pa = gap.array;
         for (let i=0; i < pa.length; i += 3) {
-            pa[i    ] -= x;
-            pa[i + 1] -= y;
-            pa[i + 2] -= z;
+            pa[i    ] += x;
+            pa[i + 1] += y;
+            pa[i + 2] += z;
         }
         gap.needsUpdate = true;
         return this;

src/mesh/api.js

@@ -192,7 +192,7 @@ let group = {
     // @param group {MeshGroup}
     add(group) {
         groups.addOnce(group);
-        space.world.add(group.group);
+        space.world.add(group.object);
         space.update();
         return group;
     },
@@ -200,7 +200,7 @@ let group = {
     // @param group {MeshGroup}
     remove(group) {
         groups.remove(group);
-        space.world.remove(group.group);
+        space.world.remove(group.object);
         space.update();
     }
 };
@@ -329,7 +329,7 @@ let api = mesh.api = {
 
     objects() {
         // return model objects suitable for finding ray intersections
-        return group.list().map(o => o.models).flat().map(o => o.object);
+        return group.list().map(o => o.models).flat().map(o => o.mesh);
     }
 };
 

src/mesh/group.js

@@ -28,7 +28,7 @@ mesh.group = class MeshGroup extends mesh.object {
     // @param group {MeshModel[]}
     constructor(models = [], id) {
         super(id);
-        this.group = new THREE.Group();
+        this.group3 = new THREE.Group();
         this.models = [];
         for (let model of models) {
             this.add(model);
@@ -40,14 +40,14 @@ mesh.group = class MeshGroup extends mesh.object {
     }
 
     get object() {
-        return this.group;
+        return this.group3;
     }
 
     // @param model {MeshModel}
     add(model) {
         model.group = this;
         this.models.addOnce(model);
-        this.group.add(model.mesh);
+        this.group3.add(model.mesh);
         space.update();
         call.model_add({model, group:this});
         worker.group_add({id: this.id, model:model.id});
@@ -67,7 +67,7 @@ mesh.group = class MeshGroup extends mesh.object {
             return;
         }
         this.models.remove(model);
-        this.group.remove(model.mesh);
+        this.group3.remove(model.mesh);
         // create message for listeners
         call.model_remove({model, group:this});
         // trigger sync with worker
@@ -75,7 +75,7 @@ mesh.group = class MeshGroup extends mesh.object {
         // ensure worker cleanup of model
         model.remove(true);
         // auto-remove group when empty
-        if (this.group.children.length === 0) {
+        if (this.group3.children.length === 0) {
             mesh.api.group.remove(this);
             // manage lifecycle with worker, mesh app caches, etc
             this.destroy();

src/mesh/model.js

@@ -102,6 +102,10 @@ mesh.model = class MeshModel extends mesh.object {
         meh.receiveShadow = true;
         meh.castShadow = true;
         meh.renderOrder = 1;
+        // center vertices then restore mesh object position
+        // let mid = meh.getBoundingBox().mid;
+        // geo.moveMesh(-mid.x, -mid.y, -mid.x);
+        // this.move(mid.x, mid.y, mid.x);
         // sets fallback opacity for wireframe toggle
         this.opacity(1);
         // this ref allows clicks to be traced to models and groups
@@ -227,6 +231,7 @@ mesh.model = class MeshModel extends mesh.object {
     }
 
     updateBoundsBox() {
+        if (this.group)
         mesh.util.defer(this.group.deferUBB);
     }
 

src/mesh/object.js

@@ -162,6 +162,7 @@ mesh.object = class MeshObject {
         this.updateBoundsBox();
         space.update();
         publish.matrix({ id: this.id, matrix: this.object.matrix });
+        return this;
     }
 };