Re: [Flightgear-devel] 0.7.9pre2

[zovier]

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On Wed, Feb 13, 2002 at 08:24:14PM -0600, Curtis L. Olson wrote:

 the moon is using a blend mode other than the default blend mode
 so that we can blend it into the gradient sky.

Thanks, that was exactly the information I needed to get me
started.

In my first try I changed the call to glBlendFunc():

In SimGear-0.0.17pre2/simgear/src/sky/moon.cxx: sgMoonOrbPreDraw()

 - line 55: glBlendFunc ( GL_SRC_ALPHA, GL_ONE ) ;
 + line 55: glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;

That worked, but made the moon look ugly. I could have been
satisfied at this point and take the ugly moon for granted.
However, on a hunch, I changed line 55 back and in
sgMoonOrbPostDraw() uncommented line 65:

 - line 65: // glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 + line 65: glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;

That works, _and_ produces a nice moon. So it appears that the
problem lies not with the blend function itself, but in the way
it is (not) handled by glPushAttrib()/glPopAttrib().

Does anyone object to leaving line 65 uncommented for now? Any
leads for a more permanent solution?


 Yes, I wish there was more choice in the 3d graphics world.  You could
 always try an ATI card.

I'd love to. Please send plenty of money. :)

 I personally have very few complaints about my nvidia card.

If it works, it works. As long as it is supported. Not a problem
if you have enough financial room for regular upgrades, and don't
care what happens to your old cards.

And that's all I'm going to say about it on-list.

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From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject: Re: [Flightgear-devel] 0.7.9pre2
In-Reply-To: [EMAIL PROTECTED]; from [EMAIL PROTECTED] on 
Wed, Feb 13, 2002 at 08:24:14PM -0600
X-S-Issue: [EMAIL PROTECTED] 2002/02/14 13:42:54 
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Re: [Flightgear-devel] 0.7.9pre2

[zovier]

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On Wed, Feb 13, 2002 at 04:19:00PM -0600, Curtis L. Olson wrote:

 From your image, it really looks like you may have a driver bug.

Yes, that is indeed likely. However, it doesn't appear to be a
memory issue. The problem is very specifically triggered by the
moon entering the active view. I have flown fgfs far and wide
with --disable-skyblend, which works just fine. No moon, no
problem. So what I'd like to know is what's so special about that
moon.

I tried running with --disable-textures, same result. (But this
option doesn't affect moon texturing.)

 Do you know if there is a more recent version of your voodoo2 driver
 available to install?

Do you know how hard it is to _find_ a voodoo2 driver these days?
Some time ago a big company, which shall remain nameless, bought
3dfx. They have now opted to yank the 3dfx site, and all support
for old cards with it. (That alone is reason enough not to buy
their cards.)

 How much memory does your voodoo2 have?

Hard to tell. It was a gift, and I have no idea how to probe it.
These cards usually have 8 megs, or if I'm lucky, 12.

- --
Regards,()
=Martin=   ASCII Ribbon Campaign Against HTML Mail  /\

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From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject: Re: [Flightgear-devel] 0.7.9pre2
In-Reply-To: [EMAIL PROTECTED]; from [EMAIL PROTECTED] 
on Wed, Feb 13, 2002 at 04:19:00PM -0600
X-S-Issue: [EMAIL PROTECTED] 2002/02/14 02:21:52 
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