[directmusic] Re: 3d processor issues
- From: "Todor Fay" <todor@xxxxxxxxxxxxx>
- To: <directmusic@xxxxxxxxxxxxx>
- Date: Wed, 7 May 2003 09:06:46 -0700
DirectMusic's 3D does take advantage of hardware acceleration. After
all, it is writing to a DirectSound 3D buffer. The 3D mechanism is
dependent on the configuration of the user's computer, which could be
set to play 3D through headphones or different configurations of 2 or
more speakers.
Yes, 3D is quieter in DirectSound than regular stereo or mono. After
all, it needs to attenuate with distance from the Listener, so the only
way that 3D could possibly be as loud is if it is set up to be at the
same location as the Listener. There may be a slight additional
attenuation from the 3D algorithm. I can't remember.
Somebody on the Dugan's team can give the definitive answer, but I think
I'm right.
Todor
(DirectMusic / DirectSound lead in a former life.)
-----Original Message-----
From: directmusic-bounce@xxxxxxxxxxxxx
[mailto:directmusic-bounce@xxxxxxxxxxxxx] On Behalf Of Alexey Menshikov
Sent: Wednesday, May 07, 2003 7:58 AM
To: Jeanine Cowen
Subject: [directmusic] Re: 3d processor issues
Hello Jeanine,
Do you know how 3d sound works?
Its made with HRTF (Head Releated Transfer Function) which is exactly
your head/ears filter.
HRTFs are very distorts sound.
And as far as i know, only software 3d sound processing works in
directmusic. Or maybe its fixed in DX9 now.
Alexey Menshikov
Action Forms Ltd.
Wednesday, May 7, 2003, 5:54:04 PM, you wrote:
JC> Hello everyone,
JC> I just found your list! I've just started work on a game being
JC> developed with the DirectMusic engine, first time I've had
experience
JC> with it. Anyway, I'm noticing a couple of things, I looked through
JC> your archive and didn't see anything so excuse me if these have been
JC> addressed before.
JC> When sending sounds through the 3d processor two things are
happening
JC> 1.) There is a huge level drop when a sound is placed as 3d compared
JC> to a 2d version. The 2d version appears to be playing at full level,
JC> ie the level I get in soundforge. Once the sound is tagged as 3d
its
JC> level drops more than 6db (not measured just to my ears)
JC> 2.) There also seems to be some sort of weird eq curve that is
JC> emphasizing some high mids, I'd say aroung 3 or 4 k.
JC> Any information on all of this would be appreciated, even if its
just
JC> to say, yeah that's the way it is. I don't want to start making
JC> corrections to the sounds themselves until I figure out if its
JC> something in the engine.
JC> Thanks,
JC> JC
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