Radius Trigger:

x
y
radius
low z (optional)
high z (required if low z is used)




This defines where the center point of your trigger is, how large it's radius is, and optionally, where it's high and low trigger areas are.

The low and high z values are to create a "3d" trigger -one that can be walked over or under without being triggered. The low z must be a value below high z (you cannot invert the low and high z values).

To create a trigger that covers the entire map, use x=0, y=0, and radius=-1 (-1 means everywhere).