force
Begins loading the resources of the given blocks and their children. If the resource had been loaded earlier and resulted in an error, it will be reloaded. Note: This function is useful for preloading resources before they are needed. Warning: For elements with a source set, all elements in the source set will be loaded.
Parameters
the blocks whose resources should be loaded. The given blocks don't require to have resources and can have children blocks (e.g. a scene block or a page block). Pass an empty list to load resources for every block currently known to the engine. Note: Returns once every resource has finished loading. The state of a block then reports the result of its fetch. A file that arrives but that the engine cannot decode keeps it pending.