[ODE] Particle/cloth/skeleton (was: Re: Choleski factorization)

[Nicholas Francis]

Would be somewhat less great for all us on non-win platforms ;-)

Cheers,
Nicholas
(mac developer)

On mandag, mar 24, 2003, at 12:13 Europe/Copenhagen, gl wrote:

>> I've always wondered if it would make any sense to use Windows' 
>> Direct3D
> vector
>> and matrix operations on Win32 platforms.  If they by chance use SIMD
>> instructions etc, you'd get that for free, and in the distant future, 
>> when
> the
>> Pentium XXIV has single-cycle matrix multiplies, you'd get that for 
>> free
> with no
>> code changes.
>
> Be nice for all us win guys, that's for sure : ).  There is some 
> processor
> specific optimisation going on in D3DX (the DX utility library that 
> provides
> quat, matrix and various vector classes/functions, amongst others), 
> and yes,
> you do get it transparently and its updated over time.  Using that 
> library
> doesn't tie you to any other parts of DX in any way (eg. there are no
> rendering dependencies).
>
> It's not clear though exactly what they've optimised - their vec3
> equivialent doesn't use padding, so they probably only accelerate a few
> complex operations.  Matrices should be (you can use an aligned 
> version),
> not sure about quats.  They do intend to keep adding optimisations in 
> key
> areas though.
> --
> gl
>
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