add mirroring, exclude normals from bounds, fix paint selection update

src/mesh/group.js

@@ -108,6 +108,13 @@ mesh.group = class MeshGroup extends mesh.object {
         return this.centerXY().floor();
     }
 
+    scale(x = 1, y = 1, z = 1) {
+        for (let m of this.models) {
+            m.scale(x, y, z);
+        }
+        return this;
+    }
+
     // center objects to group bounds
     // dependent on first being added to world/scene
     centerModels() {
@@ -141,6 +148,11 @@ mesh.group = class MeshGroup extends mesh.object {
             model.select(...arguments);
         }
     }
+
+    // ok, this is confusing, but necessary for now :/
+    setSelected() {
+        super.select();
+    }
 };
 
 })();