Re: [Algorithms] indexed face list efficiency

[Tom v. D. <to...@mu...>]

Until you start coding on PS2 though... the damn machine doesn't even know
what indices are...


----- Original Message ----- 
From: "Tom Forsyth" <tom...@bl...>
To: <gda...@li...>
Sent: Friday, January 09, 2004 12:39 AM
Subject: RE: [Algorithms] indexed face list efficiency


> IMHO, the extra cost for using indices where they are not needed is
trivial
> - it's also a really rare occasion. But the extra complication in the
> rendering pipeline to handle both indexed and non-indexed is a hassle. I
> decided to just always use indexed primitives. Makes life so much simpler.
>
> TomF.
>
>
> > -----Original Message-----
> > From: gda...@li...
> > [mailto:gda...@li...] On
> > Behalf Of Jon Watte
> > Sent: 08 January 2004 17:22
> > To: gda...@li...
> > Subject: RE: [Algorithms] indexed face list efficiency
> >
> >
> >
> > > I am including cases where verticies have multiple texture
> > UV, so it is
> > > possible to have an object with 100% distinct verticies.
> > For example a
> > > tetrahedron with different textures on each side.
> >
> > I can see it now: Wild Tetrahedron Madness! Now with Fully
> > Unique Vertices!
> > :-)
> >
> > Anyway, yes, it's more efficient to use non-indexed
> > primitives when you have
> > no sharing, as you send more data. As for exactly where the
> > cross-over point
> > is, where saving transform outweighs the cost of indices,
> > varies wildly.
> > Choosing based on overall size seems a mechanism as good as
> > any, if you're
> > not willing to profile your target hardware (or you need
> > "ONE" solution for
> > "MANY" targets).
> >
> > Cheers,
> >
> > / h+
> >
> >
> >
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>
>
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