Re: [PyOpenGL-Users] Problem with numpy arrays and OpenGL textures

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

Adeola Bannis wrote:
> Hi everyone,
>
> I'm doing a project using wxPython and pyopengl, and I seem to have a
> problem rendering textures. This is code that worked before my hard
> drive had a meltdown, but not since I re-installed everything.
>
> I've determined the problem is in the OpenGL part of my program. I do
> some calculations to generate a 2D numpy array that holds the image
> data, and pylab.imshow() shows me the image as it is meant to be. I
> used the same algorithm in Octave and MATLAB, and all are giving me
> the right picture.
>
> However, using pyOpenGL and the numpyhandler functions (http://cours-
> info.iut-bm.univ-fcomte.fr/docs/python/OpenGL/
> OpenGL.arrays.numpymodule.NumpyHandler-class.html) doesn't seem to
> work. I get a garbled screen pocked with black pixels. I am including
> my openGL code below. What am I doing wrong?
>
> And yes, I did make the dtype of my array 'float32'.
>   
When I alter your code to actually run (the attached script doesn't seem
to do anything) I wind up with a working script.  It does point to a bug
in the current PyOpenGL 3.0.0b1's handling of void pointer arrays (they
are supposed to auto-convert numpy arrays, but I had to explicitly
extract a void pointer to make it work).  I note that your spec for the
image size is wrong, you're adding 1 to the dimensions, which should not
be necessary, and could have the effect you described (garbled, with
black pixels).

I've attached what I'm running, so you can point out what's different.

Enjoy,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com