[SciPy-User] Finding contour polygons without matplotlib?

Hi all, Is there a way in scipy+numpy to calculate the contour polygons of a field z=z(x,y) without invoking matplotlib? I would like to check whether two points lie within the same contour polygons, without invoking the contouring routine from matplotlib. I would like to avoid matplotlib for two reasons. Firstly the cluster on which I work does not have matplotlib, and secondly I would like to avoid the overhead of plotting that would inevitably accompany repeated calls to the matplotlib implementation of contour. Thanks, Sourish Basu