The Boundary operator allows you to constrain particles to a tyIcon volume. Particles outside the volume can be set to loop within the boundary of the icon, be deleted, or test TRUE to satisfy the output condition.
Inside: particles will be tested to see if they are inside the boundary.
Outside: particles will be tested to see if they are outside the boundary.
Loop: particles that pass the boundary test will loop to the opposite side of the boundary.
Delete: particles that pass the boundary test will be deleted.
Test TRUE:: particles that pass the boundary test will satisfy the output condition.