add model groups

src/mesh/group.js

@@ -0,0 +1,53 @@
+/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
+
+"use strict";
+
+(function() {
+
+gapp.register("mesh.group", [
+    "add.array",    // dep: add.array
+    "add.three",    // dep: add.three
+    "moto.license", // dep: moto.license
+    "mesh.model",   // dep: mesh.model
+]);
+
+let mesh = self.mesh = self.mesh || {};
+if (mesh.group) return;
+
+mesh.group = class MeshGroup {
+
+    // @param group {THREE.Group}
+    constructor(models) {
+        this.group = new THREE.Group();
+        this.models = [];
+        for (let model of (models || [])) {
+            this.add(model);
+        }
+    }
+
+    bounds() {
+        return new THREE.Box3().setFromObject(this.group);
+    }
+
+    // @param model {MeshModel}
+    add(model) {
+        model.group = this;
+        this.models.addOnce(model);
+        this.group.add(model.mesh);
+        moto.Space.update();
+    }
+
+    // @param model {MeshModel}
+    remove(model) {
+        model.group = undefined;
+        this.models.remove(model);
+        this.group.remove(model.mesh);
+        // auto-remove group when empty
+        if (this.group.children.length === 0) {
+            mesh.api.group.remove(this);
+        }
+        moto.Space.update();
+    }
+};
+
+})();