Invisible War’s sound is designed to work with the graphics and physics to create a
more realistic feeling game world. The new sound system isn’t based on scripts
(i.e., if barrel X gets pushed it makes sound A, and if it is thrown it makes sound B when it hits something).
Instead, IW incorporates physics sound and sound propagation. This means that textures, objects,
and AI interact. What you get is a realistic sounding experience. A metal barrel scraping
against a concrete wall sounds different than a barrel scraping against a metal pipe or a barrel
rolling on carpet. You no longer have to re-learn how sound is produced in the game
because it’s just like you would expect it to be in real life.
And this all works in conjunction with the AI. They can HEAR. Instead of guards
magically knowing where you are when you make noise, the sound propagation system
allows sound to only carry realistically. Sound travels down hallways and out windows,
but the guy on the other side of a bulkhead can’t hear you knock over a barrel.
It goes for both sides, too. Gone are the days when you could eavesdrop on a conversation
behind a solid steel warehouse wall (unless the devs decide to make a BioMod for that...)
It should be much more fun and rewarding to use sounds to trick the AI now. You just
have to think of how you would do it in real life. Throw a gas grenade into dark room
and a guard will go into that room to investigate the sound, only to have the grenade knock him out.
There is even an object that imitates voices. Hide it anywhere for the perfect distraction!
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