[ODE] More speed???

[Flavien Brebion]

The reasons NOT to use DX have been mentionned before:

- "very good and fast maths libraries on a windows platform". You said
it yourself: Windows. This means developping a specific solution for
Linux or other OSes, as i guess D3DX is not available for those. So
since you'll be developping a specific solution anyway, why just not
make it portable and use this specific solution for windows too ?

- not inlining calls for a maths library is going to have a major
impact on performance, cancelling the benefits of using D3DX in the
first place.

DirectX has components for 2D and 3D graphics, user input, sound
and musics, networking, videos, etc.. but nothing for physics or
collisions. It does not make sense to use a small component like
the D3DX maths library while 99% of the rest of the API will not be
used at all. If you really want to use a 3rd party optimized maths
library, i'm sure it's possible to find a good, open-source and
portable alternative on the net. Just my opinion.

F. Brebion


-----Original Message-----
From: ode-bounces at q12.org [mailto:ode-bounces at q12.org]On Behalf Of
DjArcas
Sent: Friday, November 07, 2003 12:27 PM
To: fmarmond at eprocess.fr; Gary R. Van Sickle
Cc: ode at q12.org
Subject: Re: [ODE] More speed???


DirectX is NOT a graphics API, it is a suite of hardware abstraction
utilities to let you write multimedia applications. DirectX is a hell of a
lot more than Direct3d.

I can see no reason against using their very good and fast maths libraries
on a windows platform - even if you use OpenGL for some odd reason, you can
still use directinput, directsound, etc.

Admittedly, yes, we are then relying on a non open source system, but there
is no denying that it's good!

Adam

----- Original Message -----
From: "Frederic Marmond" <fmarmond at eprocess.fr>
To: "Gary R. Van Sickle" <g.r.vansickle at worldnet.att.net>
Cc: <ode at q12.org>
Sent: Friday, November 07, 2003 7:53 AM
Subject: Re: [ODE] More speed???


> >
> >
> >[..]
> >I've said this before, but one way of doing this pretty easily would be
to use
> >Windows' DirectX vector and matrix manipulation functions, which take
care of
> >all such craziness for you.  Yes, that would leave the Unii out in the
cold
> >(unless there's a Unix DirectX clone out there somewhere), but it'd be an
easy
> >way to start.  And you could always create a small Unix SIMD
DirectX-compatible
> >library later.
> >
> >
> NO NO NO!!!
> please, keep in mind that ODE is 'ONLY' the PHYSIC ENGINE.
> So, any reference to a graphic API must be avoided (exept for exemple,
> testing, ...) But not in the core!
> Please, keep DirectX out of this!
> (plus, you would loose the 'O' of ODE, which means 'Open'... ;))
>
> Fred
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