AssertionError: More than one generic attribute with index 0 (pyglet-1.2alpha1)

[Doeke]

When trying to use a single generic+static_draw attribute. I had a look in vertexdomain.py, and it appears that static attributes end up being added before *and* after being grouped and interleaved:

            if usage == GL_STATIC_DRAW:

                # Group attributes for interleaved buffer

                static_attributes.append(attribute)

                attributes.append(attribute)

...

            attributes.extend(static_attributes)

Removing the line "attributes.append(attribute)" seems to fix the problem.

(btw, using generic attributes for position/normal is the correct way to do it now that gl_Normal etc are depreciated, is it not?)