flow and cut spheres...

 From:  macray
I'm not sure if this has been posted before so don't hang me if I overlooked some topic.

While testing the flow command I found something pretty strange:

Using an arc and revolving it 180 degrees and then use the flow to project something gives a different result than a sphere cut to 50%, giving me the same shape.

The flow around the sphere seems to ignore that there are parts not there anymore. (you can see that the hexagonal pattern is going all around even though there is no bottom half of the sphere anymore)

attached a picture illustrating this issue.
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