Re: [Celestia-developers] Celestia 1.3.2 pre4

[Don G. <do...@do...>]

Hey Chris, quit finding bugs in everyone's graphics card drivers, will
ya <laughing>? If it IS the ATI drivers, it may be a while before it
gets fixed, since a new version just came out <sigh>.

Some further info: After a goto, when zooming OUT, little by little
... half of the object will suddenly be drawn okay (Earth at 50K km),
then further out the entire object is drawn okay.

Compile from CVS didn't change anything.

Added "GL_ARB_vertex_buffer_object" in "IgnoreGLExtensions" and it
works now. I left the commented line the way it was and simply a new
line with this statement.

Thanks for the tip regarding the troubleshooter hardware accel slider.

-Don G.


----- Original Message ----- 
From: "Chris Laurel" <cl...@ww...>
To: "Don Goyette" <do...@do...>
Cc: "Celestia Developers" <cel...@li...>
Sent: Thursday, February 26, 2004 3:02 AM
Subject: Re: [Celestia-developers] Celestia 1.3.2 pre4


> On Thu, 26 Feb 2004, Don Goyette wrote:
>
> > Hi Chris,
> >
> > Just tried a clean install of pre4 on WinXP Pro, with an ATI
Radeon
> > 9700 Pro (128 MB).
> >
> > The planets and moons are drawn with a ton of triangles growing,
> > shrinking, popping up, etc. and the surface cannot be seen.
>
> I modified lodspheremesh.cpp to take advantage of the
vertex_buffer_object
> OpenGL extension to render planet spheres faster.  The change
doesn't
> affect rendering of mesh files, so a bug in this code is consistent
with
> your report.  Actually, it may be a bug in the ATI OpenGL driver
that's at
> fault--the new code works fine on my system.  There are a couple
things
> that you can try.  First, try updating from the CVS server and
building
> Celestia yourself.  If that doesn't work, try adding
> ARB_vertex_buffer_object to the list of ignored GL extensions in
> celestia.cfg--that will have the effect of disabling the new sphere
> rendering path.
>
> > I ended up going into Troubleshooting and turning the hardware
> > acceleration down to the mid-point, where it says "Disable all
> > DirectDraw and Direct3D accelerations, as well as all cursor and
> > advanced drawing accelerations."
> >
> > >From this point on down the acceleration slider, it works fine,
but
> > VERY slow (obviously).
>
> Yeah . . . you just turned off hardware OpenGL, and forced Celestia
to use
> the software renderer.  For future reference, it's not worth
bothering
> going through the effort to adjust the acceleration slider.
Microsoft's
> software OpenGL implementation is so outdated that it's only very
rarely
> useful for debugging Celestia's rendering code.
>
> --Chris
>
>
>
>