Re: [PyOpenGL-Users] A puzzle regarding running PyOpenGL interactively

[<il...@ya...>]

I'm not sure about tk; but I use pygame interactively
a lot.

Maybe you need to call the buffer flip functions, or
define a redraw function?



In my code I have display objects with start, and stop
video method calls.  Which basically call
pygame.display.init() and pygame.display.quit() (
which opens and closes the display).

Then I have a draw method.

This all works nicely with nvidia drivers on linux.


I get the same behaviour with your tk example.


Sorry I'm of not much help.


 --- Perry Greenfield <pe...@st...> wrote: > We
have had problems with PyOpenGL for more recent
> releases
> of Redhat (e.g., 6.x,7.x, 8.x) that manifest
> themselves in odd ways.
> This is the simplest illustration of something that
> works for
> some OpenGL implementations and not others.
> 
> If you start an interactive Python session and types
> the following
> sequence of commmands:
> 
> >>> import OpenGL
> >>> from OpenGL.GL import *
> >>> from OpenGL.Tk import *
> >>> o=Opengl()
> 
> >>> Exception in Tkinter callback
> Traceback 
> [...]
> AttributeError: 'Opengl' instance has no attribute
> 'redraw'
> [window turns pink]
> 
> >>> glClearColor(1,0,0,0)
> >>> glClear(GL_COLOR_BUFFER_BIT)
> 
> On some installations, this results in a Tk window
> appearing, and
> the last command changes the background color to
> red.
> On other installstions, nothing happens with the
> last command.
> (Nor does the window turn pink on o=Opengl()).
> The above will not work for the default
> installations of OpenGL
> for Redhat 8 for example (The SGI library
> apparently).
> 
> [A natural question is why anyone would run OpenGL
> in this manner.
> We use OpenGL to generate plot windows from an
> interactive
> command line for a scientific command-line-oriented
> analysis
> environment. We do not use it in the usual way of
> generating
> a standalone GUI application. The above test
> illustrates the
> installations for which the plotting windows are
> nonfunctional
> or not]
> 
> Does anyone understand what it is that causes
> PyOpenGL to stop
> working with Python's interactive mode?
> 
> When we use Mesa instead on Redhat, it works.
> Unfortunately some
> users have NVIDIA cards that require the NVIDIA
> OpenGL library
> which does not work.
> 
> We would like to understand what the fundamental
> problem is and 
> whether there is any solution.
> 
> Thanks, Perry Greenfield
> 
> 
> 
> 

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