circular collision shape of an actor?

Are actors always overlaping/colliding with other actors as squares?
I want to do and actor that follows a mouse position and when it overlaps other actor do something to them, but i want it to overlap as a circle - kind of like dragging a circle around the stage with your mouse and when an actor is inside that circle i want it to disaper for example?
Thanks in advance!
I want to do and actor that follows a mouse position and when it overlaps other actor do something to them, but i want it to overlap as a circle - kind of like dragging a circle around the stage with your mouse and when an actor is inside that circle i want it to disaper for example?
Thanks in advance!
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PHYSICS > COLLISION SHAPE > CIRCLE