pyopengl-users

[PyOpenGL-Users] NullFunctionError when calling glGenVertexArrays

[Jon N. <jo...@gm...>]

Hi all,

I'm having problems using the function glGenVertexArrays despite the fact
that I've correctly imported OpenGL.GL.ARB.vertex_array_object. Here's the
output I get from my (simple) program:

Traceback (most recent call last):
  File "cube.py", line 24, in <module>
    batch.begin(GL_TRIANGLES, 36)
  File "cube.py", line 20, in begin
    glGenVertexArrays(1, self.vertexArrayObject)
  File "c:\Python26\lib\site-packages\OpenGL\platform\baseplatform.py", line
340
, in __call__
    self.__name__, self.__name__,
OpenGL.error.NullFunctionError: Attempt to call an undefined function
glGenVerte
xArrays, check for bool(glGenVertexArrays) before calling

If it makes any difference, I'm on Windows 7. Any ideas?


Thank you,
Jon Nye

Re: [PyOpenGL-Users] NullFunctionError when calling glGenVertexArrays

[Ian M. <geo...@gm...>]

Hi,

I always recommend using the OpenGL.arrays package:

from OpenGL.arrays import vbo
#...
myVbo = vbo.VBO(numpy.array(n_by_3_list,"f"),usage='GL_STATIC_DRAW')
#...
glVertexPointerf(myVbo)

Ian