context reinit support

glscene.cpp

@@ -101,7 +101,20 @@ void Scene::clear() {
 	geometries.clear();
 	materials.clear();
 	emit __destroyed();
-	emit treeChanged();}
+	emit treeChanged();
+}
+
+
+void Scene::reinitAll() {
+	for (auto * i: geometries)
+		i->reinit();
+	for (auto * i: td_geometries)
+		i->reinit();
+	setTreeChanged();
+	mat_changed = lights_changed = true;
+	need_reload_materials = true;
+	tree_struct_changed = true;
+}
 
 
 void Scene::objectsCountInternal(int * cnt, ObjectBase * where) {