Crease sets and other sub-div options

The subdiv toolset looks amazing, though I am having trouble understanding some of the options.
How can I choose which edges become creased and which do not?
It looks like rhino makes some decisions depending on how the mesh was created.

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I have the same problem, how can I determine if an edge will be creased or not?
I understood that an option to crease edges will become available later, but how can I make sharp edges now?

Try to unweld a mesh edge.

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Thank you, that works

hmmm… it didn’t work for me. mind posting a screenshot?

Unweld the edges of a mesh and then make a subd object from the mesh, with the option creases=yes
see the differences between the ellipsoid with unwelded edges and without.

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