How to align points into a circle?

[bottleofram]

I don't really know how this tool is called but i saw in some other packages you can select points and execute a command that aligns them into a perfect, round circle.

Do we have a tool or a script for this in xsi?

Thanks.

[origin]

http://maxfoxlab.com/mx_roundish.html

or Circularize @ rray.de

[bottleofram]

Perfect. Thank you.