How do I detect an overlap of several instances of the same object ?

Hello !

I have several green squares in my scene (same object but several instances of it) and I have a circle that I can move.

I would like to activate an action when the circle is overlapping more than one square but I don't find the correct event.

Could someone help me ? Thanks a lot !

You could check if the circle is overlapping a square. Then set a variable to that square's UID. Then check again if the circle is overlapping a square but only ones that dont have the UID of the first one.

I think you can use expression ".Count" for the green squares, something like red circle is overlapping green and green.Count > 1

You could probably run a for each square loop

set global variable squarecount, then for each square if overlapping circle add 1 to that variable, so you should get exactly how many are overlapping.

Don't forget to reset thev ariable to 0 before the loop, otherwise it will just keep adding up

I'm not sure I understand BadMario. I put the .c3p file here if you want to take a look.

Here is my event sheet but it makes the global variable increase, it doesn't count the number of overlapping squares. :/

I'm surprised that there is no option in the "overlap" event to choose the number of instance to overlap in order to activate the action.

Might be simpler to just check the "PickedCount" expression under the overlapping condition.

+ Circle: Is overlapping Square

+ System: Square.PickedCount >= 2

-> (Do something)

I absolutely didn't know about this expression, thanks a lot Magistross !