What the engine draws over the game and no script owns: the pickups that slide in, the assault course digits, and the lines of text the rest of the engine asks for.
Only what a script has to answer for is here. The lines of text are the engine's own, and a script neither reads nor writes them.
trx.overlay.has_letterbox (boolean). Whether the cinematic bars take any of the screen. It stays true while they
move, so a script can hold something back until they have gone. (read-only)trx.overlay.signals.letterbox (trx.signal.Signal). Says when the cinematic bars take the screen and when they give it back. True
while they are moving, so a script can hold something back until they have gone. (read-only)trx.overlay.signals.health_bar_forced (trx.signal.Signal). Says when something asks for Lara's health bar whatever else is on screen, which the inventory ring does while it shows a medipack. (read-only)