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FUNC_AREAPORTAL
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This is a non-visible object that divides the world into

areas that are seperated when this portal is not activated.

Usually enclosed in the middle of a door.

Example use: select func_door_rotating and open
Entity inspector. Find fields with "key"
and "value".

Key	target
Value	t94

Value is the targetname of func_areaportal.

Select func_areportal and open Entity inspector.

Key	targetname
Value	t94

Targetname of func_areaportal.

Key	style
Value	1

Style used as areaportal number.

Place func_areaportal in the middle of a door (func_door_rotating).