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I just tweaked the example at http://matplotlib.org/examples/mplot3d/hist3d_demo.html by replacing dx and dy with 1.
Same thing for dx,dy=.5
Thanks, sorry for the noise then. I'll use Mayavi for now.
* removed stacked 3d bar charts
they are too buggy and unlikely to work any time soon (see matplotlib/matplotlib#155/ and matplotlib/matplotlib#1292/)
* further cleanup/simplify charting code (in part thanks to the removal of stacked bar3d)