Using framebuffers

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Dear Pyopengl users,

I am a beginner who studies OpenGL using PyOpenGL. I want to learn
post-processing effects and as the first step I want to be able to render a
scene into a FBO and then render that FBO on a quad that cover the whole
screen.

The python code I am running is this:
https://gist.github.com/vug/2c7953d5fdf750c727af249ded3e9018 I combined
parts from several tutorials I found on the internet.

I suspect that nothing is written to the texture of FBO. Sometimes I have a
solid black window, and sometimes there are random noise at some parts of
the window (probably this happens when texture buffer is not filled with
zeros).

I am using Python 3.5.0
numpy==1.11.0
PyOpenGL==3.1.0
PyOpenGL-accelerate==3.1.0

I appreciate if anyone can direct me on how to render on an offscreen
framebuffer via PyOpenGL.

Regards,
ugur

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<div dir=3D"ltr">Dear Pyopengl users,<div><br></div><div>I am a beginner wh=
o studies OpenGL using PyOpenGL. I want to learn post-processing effects an=
d as the first step I want to be able to render a scene into a FBO and then=
 render that FBO on a quad that cover the whole screen.</div><div><br></div=
><div>The python code I am running is this:=C2=A0<a href=3D"https://gist.gi=
thub.com/vug/2c7953d5fdf750c727af249ded3e9018">https://gist.github.com/vug/=
2c7953d5fdf750c727af249ded3e9018</a> I combined parts from several tutorial=
s I found on the internet.</div><div><br></div><div>I suspect that nothing =
is written to the texture of FBO. Sometimes I have a solid black window, an=
d sometimes there are random noise at some parts of the window (probably th=
is happens when texture buffer is not filled with zeros).=C2=A0</div><div><=
br></div><div>I am using Python 3.5.0</div><div><div>numpy=3D=3D1.11.0</div=
><div>PyOpenGL=3D=3D3.1.0</div><div>PyOpenGL-accelerate=3D=3D3.1.0</div></d=
iv><div><br></div><div>I appreciate if anyone can direct me on how to rende=
r on an offscreen framebuffer via PyOpenGL.</div><div><br></div><div>Regard=
s,</div><div>ugur</div></div>

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