Re: [PyOpenGL-Users] offscreen rendering problem with glInitFramebufferObjectEXT

[Revaz Y. <yve...@ep...>]

Dan Helfman wrote:
> Revaz Yves wrote:
>   
>> Dear List,
>>
>> I would like to use off-screen rendering with PyOpenGL.
>> According to the few informations I found on the web, one method is
>> to use a FrameBufferObject.
>>
>> Unfortunately, when initializing a new FrameBuffer :
>>
>> from OpenGL.GL.EXT.framebuffer_object import *
>> glInitFramebufferObjectEXT()
>>
>> I get :
>>     
>
> [error snipped]
>
> Have you tried initializing PyOpenGL first?
>
> When I try running those two lines of code on a machine that I know has 
> the frame buffer object extension, without initial PyOpenGL first, I get 
> the same error message.
>   
ok, fine ! now it works, after a

glutInitDisplayMode

which initialize OpenGL.
But how can I initialize OpenGL without creating a window ?

> In general, I would recommend using the frame buffer object extension 
> for off-screen rendering. 
ok, so I'm on the right way.
Any example will be welcome...

Cheers,

yves
> There are older techniques like p-buffers, but 
> they're more difficult to use. One downside of frame buffer objects is 
> that some older/cheaper graphics chipset drivers do not support them.
>
> Dan
>   


-- 
                                                 (o o)
--------------------------------------------oOO--(_)--OOo-------
  Yves Revaz
  Laboratory of Astrophysics EPFL
  Observatoire de Sauverny     Tel : ++ 41 22 379 24 28
  51. Ch. des Maillettes       Fax : ++ 41 22 379 22 05
  1290 Sauverny             e-mail : Yve...@ep...
  SWITZERLAND                  Web : http://www.lunix.ch/revaz/
----------------------------------------------------------------