pyopengl-users

[Pyopengl-users] patch to trackball.py

[Alastair (L. T. <liq...@op...>]

Hi PyOpenGL Developers,

First things first, Thanks for the OpenGL python class that you have all
created. It's very impressive indeed!

I have a few issues that I want to bring up,

1. trackball.py

I have been playing around with trackballing under C, and I find that
the trackball.py is horribly broken. It makes me wonder whether it was
included there by accident. After spending quite a bit of time looking
at it, I found that there were a fair number of bugs in it, which I have
fixed up.

The patch is attached. It's made against the PyOpenGL-2.0.44
OpenGL/trackball.py using diff -u.

Basically, the quaternion.py included has the scalar as the first
argument rather than the last as in most implementations. Other changes
are included in the patch - so I won't bore you guys here :)

2. Vertex Arrays in PyOpenGL 2.0.44

Are the working ? I just get seg faults everytime I try glDrawElement()
and others ? Maybe it's just me :)

Thanks guys,

Alastair
-- 
________________________________________________________________________
 Alastair Tse -=- https://www.liquidx.net/ -=- al...@cs...
     ___                                   -=- li...@op...
    /__/\  - opengl for ascii              -=- icq - 118396999
    \__\/  
" I'm sorry, our software is perfect.  The problem must be you."
  -- Dogbert

RE: [Pyopengl-users] patch to trackball.py

[Mike C. F. <mcf...@ho...>]

The Trackball in the base distribution (PyOpenGL) likely hasn't been used,
save possibly by some of the TK demos.  I use a different Trackball (and
Quaternion) implementation in OpenGLContext.  Suppose we need some tests for
the one in the base distribution.  Also need to work on unifying the two
some day I suppose.

Vertex arrays certainly work for me.  Can you tell us what your system
configuration is?  Do you have OpenGLContext installed?  If so, it's got
lots of tests in the tests directory that do basic vertex, normal, colour,
etceteras array drawing.  Those all run fine on my machine, so if they don't
on your machine it's likely a compilation or similar problem rather than
user error.

Thanks for the patches, I'll let Tarn do the integration, since it's his
module these days.  Enjoy,
Mike

-----Original Message-----
From: pyo...@li...
[mailto:pyo...@li...]On Behalf Of Alastair
(LiQUiDx) Tse
Sent: September 5, 2001 11:06
To: pyo...@li...
Subject: [Pyopengl-users] patch to trackball.py
...

1. trackball.py
...
2. Vertex Arrays in PyOpenGL 2.0.44

Are the working ? I just get seg faults everytime I try glDrawElement()
and others ? Maybe it's just me :)
...

RE: [Pyopengl-users] patch to trackball.py

[Alastair (L. T. <liq...@op...>]

Hi Mike

On 05 Sep 2001 18:25:20 -0400, Mike C. Fletcher wrote:
> The Trackball in the base distribution (PyOpenGL) likely hasn't been used,
> save possibly by some of the TK demos.  I use a different Trackball (and
> Quaternion) implementation in OpenGLContext.  Suppose we need some tests for

I just checked the changelog and it seems like trackball.py was only
added since the last point release. I'm happy that it least its working
now :). I was planning to use the OpenGLContext, but I was porting an
OpenGL program I was working on in C to Python to check out the
performance differences. So using plain OpenGL + GL* was more suitable
than figuring out OpenGLContext.

> Vertex arrays certainly work for me.  Can you tell us what your system
> configuration is?  Do you have OpenGLContext installed?  If so, it's got
> lots of tests in the tests directory that do basic vertex, normal, colour,

I've got OpenGLContext installed, maybe I'll have a look at those. The
demos in the OpenGL directory don't use vertex arrays at all (as far as
I grepped).

Thanks,

Alastair.

-- 
________________________________________________________________________
 Alastair Tse -=- https://www.liquidx.net/ -=- al...@cs...
     ___                                   -=- li...@op...
    /__/\  - opengl for ascii              -=- icq - 118396999
    \__\/  
" I'm sorry, our software is perfect.  The problem must be you."
  -- Dogbert