How to do this?

[Dimitri]

The idea I have is a very simple one... but let wait a little bit more, really... : - )

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Well, as it seems there is no any answer… so, let explain the idea:

It is all about having a command similar to the ‘cut’ one we already have for cutting edges… but in this case for cutting loops in as many parts we want…

We do select a loop and click ‘divide loop’… there opens a dialogue which asks the number of parts we want to cut the loop… we do give the number and click ‘ok’: the selected loop is cut in as many equal parts we want.

Having such a command in our disposition the case with the spiral here is quite easy to manage: imagine that we want to cut it into two equal parts… we do select all the horizontal loops (as in the first image below)… we do ‘cut’ them to two parts (there appears a new vertice in the midst of each of them - as in the second image)… and then we do say ‘connect’ and create a vertical loop between the newly produced vertices (as in the third image). And, finally, there it is… we do have the spiral divided into two exactly equal parts. The same procedure may be followed in the cases where we may need cutting it in much more parts also, as is easily understandable.

All the needed thing is a ‘divide loop’ command…