Alejandro Segovia wrote:
> Hi
>
> I've been working with VBO's to speed up my rendering time. I have an
> array loaded with vertex data up to the middle and from there to the
> end loaded with color data, but I'm having trouble setting the
> appropriate offset in the glColorPointer() call.
>
> I've tried several approaches but they either raise an exception or
> draw nothing. The only thing that seems to work is using None (which
> automatically gets converted to NULL).
>
This will be because it was creating a 1-element array of integers (the
offset) and then attempting to draw from it (duh).
> Does anyone know what would the correct idiom be for converting from
> an int into the offset "pointer" needed by PyOpenGL?
>
You need a ctypes.c_void_p( offset ), or if you're using
OpenGL.arrays.vbo.VBO, you can just pass (your_vbo + offset) which
creates an object whose array-value is ctypes.c_void_p( offset ). There
was a bug in a 3.0.0 release (I believe a beta) that prevented
interpreting the c_void_p( offset ) correctly. If it doesn't work, you
may need to update to a 3.0.1 beta.
HTH,
Mike
--
________________________________________________
Mike C. Fletcher
Designer, VR Plumber, Coder
http://www.vrplumber.com
http://blog.vrplumber.com
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