type limit on parent view - form

[Shotfree]

good evening to all, I would like to ask if there is a possibility to assign a form different from the classic circle or ellipse to the line of delimitation of the sight. In particular, I would like to know if there is the possibility of assigning a rectangular / square shape instead of the circle, ellipses or splines.
Thank you for your help!

 

[AndreaTerzi]

Nothing.

 

[Shotfree]

Nothing.

thanks for the information % 1, I suspect there was no possibility of changing geometry, but did I even try?