Re: [gl4java-usergroup] GLJPanel bug?

[Toshiyuki I. <is...@mi...>]

Thanks for your reply.

----- Original Message -----
From: "Sven Goethel" <sgo...@ja...>
Sent: Tuesday, December 11, 2001 11:24 AM


> On Tuesday 11 December 2001 02:44, Sven Goethel wrote:
> > On Monday 10 December 2001 21:30, NM...@th... wrote:
> > > Hi,
> > >
> > > Regarding your first issue...
> > >
> > > Try calling " gl.glTranslatef(0.0f,-1.0f,0.0f) " .
> >
> > the upside-down problem will be solved with this trick,
> > without any big performance lost ..
> >
> > so, i might should add this to the class into the init method ..
> >
> > if nobody complains (please vote), i will do so !
> >
> > i guess this is much faster, than the java image transformation ;-)
> >
> > thanxs to Noah
> >
>
> oops .. i guess i was to fast ..
>
> this is not a general purpose solution,
> a glRotatef neither ..
>
As my reply to Noah, I can't understand calling glTranslate.
Please tell me its meaning.
Here, I try to call 'gl.glScalef(1.0f, -1.0f, 1.0f)' after
initialize MODELVIEW matrix.
Then, the Panel shows the correct view without turning upside down.

> a general purpose solution would be, like Toshiyuki's one,
> but i am afraid that this one is a big performance lost ..
> even if it works nice !
>
> so, we must live with it, and the application should take care about it,
> or we better need a general purpose gl solution ..
>
> please send your ideas ..
>

I think so.
If any document about this problem (upside-down problem) is available,
maybe I didn't comfuse.
I wish to give some attension about this to users in FAQ, manual or API doc.

Regards,

--
Toshiyuki Ishimura