RE: [GD-Windows] From OGL To D3D

[Brian H. <bri...@py...>]

They also differ in handedness.  And the extra world matrix in D3D adds 
some complication (potentially -- I just keep it at identity).

Brian

At 10:30 PM 2/8/2002 -0600, Paul Bleisch wrote:

>OpenGL uses -1 < w < 1 for the clip space, while D3D
>uses 0 < w < 1 which for practical purposes means you
>have to scale (or divide) by two in some places to get
>exact visual similarity.  I don't remember the details
>either, but I think that was the biggest problem.
>
>Paul
>
>
> > -----Original Message-----
> > From: Brian Hook [mailto:bri...@py...]
> > Sent: Friday, February 08, 2002 11:00 AM
> > To: gam...@li...
> > Subject: Re: [GD-Windows] From OGL To D3D
> >
> >
> > At 11:49 AM 2/8/2002 -0500, Dave Smith wrote:
> > >Before I embark on this great quest of porting some of my
> > code from OGL
> > >to D3D, I would like to know if there are any good sites
> > that discuss
> > >this issue.
> >
> > No sites, unfortunately, at least that I'm aware of.
> >
> > If you're targeting DX8, then the transition should be fairly smooth
> > (depending on how much OGL you were using).  Most of the
> > state stuff has
> > direct analogs.  Probably the biggest area of confusion for
> > me was making
> > sure my matrices were matching correctly.  I don't remember the exact
> > details, but it took some trial and error before I figured
> > out how to map
> > an OpenGL projection matrix to the D3D one.
> >
> > Brian
> >
> >
> > _______________________________________________
> > Gamedevlists-windows mailing list
> > Gam...@li...
> > https://lists.sourceforge.net/lists/listinfo/gamedevlists-windows
> > Archives: http://sourceforge.net/mailarchive/forum.php?forum_id=555
> >
>
>_______________________________________________
>Gamedevlists-windows mailing list
>Gam...@li...
>https://lists.sourceforge.net/lists/listinfo/gamedevlists-windows
>Archives:
>http://sourceforge.net/mailarchive/forum.php?forum_idU5