pub fn install_extract_pipeline(app: &mut App)Expand description
Install the pipeline that turns the main world into a paintable scene: the
built-in extractors, the dirty roll-up that decides whether a tick extracts
at all, and the Prepare systems that cull what was extracted and fold the
rest into the retained node tree.
A render backend calls this when it installs itself. An app with no render backend, such as the browser runtime or a server render, never does, and so carries none of it: the page’s own engine lays out and paints there.
The built-in chain goes ahead of whatever a plugin already appended with
App::add_extract_fn, so stash_hidden_entities still runs first and
primes the hierarchy memos for the rest. Installing twice is a no-op, which
is what lets an offscreen renderer sit beside a window in one app without
doubling the chain.