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A cubic surface with an uniplanar
(U7 or D5) double point.
See Cubic Surface Homepage.
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All images are created by Oliver Labs using the software surf written by Stephan Endrass and others.
Here is the surf source code of the image above.
Oliver Labs: my homepage: OliverLabs.net, my e-mail: suse TheAtSymbol OliverLabs.net