This more flexible 'filled' option is available for 3-D plotting, as well. See ?plot/options and ?plot3d/option.
To follow up on this discussion, updated polynomial arithmetic is one of the efficiency improvements in Maple 14: updates/Maple14/efficiency.
Roman describes this work in a series of primes posts, the most recent of which is here.
Thanks for bringing this display issue to our attention. Our developers are investigating the problem. (Alec, I hope you received my email on Friday.)
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