Spent a few hours working on getting PyVRML97 (on which OpenGLContext is built) updated to use Cython instead of hand-coded C modules for the accelerators.  The transformation-matrix stuff worked pretty well, but so far the frustum-culling code isn't happy.  I'd like to get the rework done before releasing a new version of OpenGLContext (which really should, as was pointed out to me) happen some time soon.  Of course, Android development is sitting in the "should happen some time soon" pile too :) .