Re: [PyOpenGL-Users] My PyOpenGL problems

[Richard J. <ric...@op...>]

On Sat, 17 Nov 2001 17:54, Jan Ekholm wrote:
> On Sat, 17 Nov 2001, Richard Jones wrote:
> >On Thu, 15 Nov 2001 18:17, Jan Ekholm wrote:
> >> The surfaces work ok now, I got pyopengl installed ok and even hw
> >> acceleration working on my ancient Matrox G450.
> >
> >Hey, I'm running a G400, which I hardly consider ancient :)
>
> I have a G200 at home, and that one sure is ancient. It would be fun to
> ttest with some really new card, such as some top notch GForce3

I remember when quake3 came out, and all I had was a G200. Ran just fine :)


> >> I must say that the speed
> >> is pretty impressive too, so pyopengl seems like a very good thing.
> >
> >Yes - I'm hitting slowdowns, and I'd like to figure out if it's because
> > I'm either:
> >  1. doing too much Python
> >  2. overloading the G400 with draw commands.
>
> It also seems to matter a great deal what you do. I experimented with
> various ways to apply textures, and when using GL_DECAL things slowed down
> to a crawl. It was one single texture used as a background for the scene.
> GL_MODULATE and GL_REPLACE was at least 10x faster. Either that mode is
> terribly slow to do, or it just isn't accelerated at all in the Matrox
> drivers.

Yeah - I'm still learning about the various texture modes. I have the Red 
Book, but haven't read the section on texturing yet. Just played with display 
lists to get little trees on the landscape :)


> I'd say that less Python is always better, but tweaking and OpenGL app for
> performnce is a nvere-ending task. There's always something more that can
> be done.

Yeah, I have a couple of loops in my code - the Exhaust is one of them. Once 
things settle down a little, I'll experiment with moving some of them out 
into C. I've done a fair bit of C extension writing, so it shouldn't be too 
painful.


> >> 	http://www.infa.abo.fi/~chakie/cm/snapshot14.jpg
> >
> >How are you taking the screenshots?
>
> ksnapshot. I suppose any app would do (xv, display etc), but I just like
> that one.

*smacks forehead* sorry, dumb question ;)


> Is there any chance I could have a peek anyway? Or at least a shot or two?
> I'm always interested in learning from others. The heightmap approach is
> probably a very common one, I use it myself. Is your terrain textured,
> colored or both?

It's textured from the colour map ;)

Screenshots, code and ramblings about it all:
  http://goanna.adroit.net/~richard/ufo/


    Richard