Compound zones of "union" or "intersection" type

A compound zone of "union" or "intersection" type is a zone formed by the union or intersection of several simple or compound zones.

Create a compound zone of the "union" or "intersection" type:

1.Click on the button to open the editing window of a compound zone:

2.Choose the "Union" or "Intersection" type

	Name :
	The name of the zone

Zone entry settings :

Allows you to configure the conditions that define the entry and exit of the zone:

The animal's center : the animal is considered to be in the zone when its center of gravity is in the zone.

A percentage of the surface of the animal : The entrance and the exit of the zone are determined according to the percentage of the surface of the animal located in the zone.

In the example opposite, the animal is considered to enter the zone when more than 70% of its surface is inside the zone. It comes out of it when there is less than 50% of its surface inside the zone.

The output percentage value must be less than the input percentage value.

The difference between the 2 values (here: 20%) makes it possible to avoid spurious entries/exits when the animal is close to the edge of the zone.

The position of the animal's head : the animal is considered to be in the zone when its head is in the zone.

To be able to use the position of the animal's head as an entry criterion in the zone, you must validate the "Detect the animal's head" option in the " General " tab of the " Protocol " dialog box.

	Background :
	Color and style of the background.

	Union / Intersection :
	The Boolean operation defining the combination of zones.

	List of zones :
	Click the checkboxes to select the zones forming the combination. For each zone, it is possible to choose either the inside or the outside of the zone.