/agdg/ - Amateur Game Development General

>>21366

Not an expert, but you'll probably need a lot of event handling.

Do you mean making the game react to the beat of a song? Cause Audiosurf does that, you might want to check out how it handles songs. You could extrapolate that way of handling it into the game. Necrodancer also does something similar.

Or are you talking about changing the beat of the song to react to the events of the game. That's actually really easy to do, as you are just changing the music file based on health/enemies/etc.

Check out https://docs.unrealengine.com/latest/INT/Engine/Audio/Overview/index.html for more info on the unreal audio stuff.

>>21370 here, allow me to elaborate.

I'm assuming you want something akin to The Legend of Zelda: The Wind Waker, where the battle music had trumpets/strings cutting in whenever the player landed a hit. There's also Metal Gear Rising: Revengeance, where boss battle music had two mixes (vocals and non-vocals), and the song cuts to the vocal version when the boss's weak point is exposed.

Basically, here's what the process looks like, from the POV of the music-playing code, so to speak.

>Wait for Enemy to send an event saying they got hit

>Determine if it's the player that hit them

>Play a sound effect

The enemy needs to send the Music Engine an "event" telling the Music Engine that someone got hit, who did the hitting, and (for the special fancy riff that plays during Parry Attacks in WW), what kind of hit it was.

Good news, UE4 already has this implemented. In fact, almost every modern game engine has one of these "event-handling" systems, and they are quite flexible. The trick is learning to use them.

If you're making your own engine, that's a bit more tricky, and beyond my expertise.

>>21378

>>21378

>There's also Metal Gear Rising: Revengeance, where boss battle music had two mixes (vocals and non-vocals), and the song cuts to the vocal version when the boss's weak point is exposed.

There is also Resonance of Fate, which started to play a more upbeat version of the same song whenever you entered Resonance mode.

This is done by either playing the "upbeat" or vocal channels of the song over the normal version at the same time, but reducing its volume to 0 until the point where you want to play the full version; or by making two versions of the same track and decrease the volume of one of the tracks at the same rate you increase the other one to swap the song.

How does the file system of a game like Guitar Hero or Dance dance revolution works?