Agent detection problem/error

I'm using llSensorRepeat in a security system. It detects agents within a set range, and deals with them after several warnings - the usual thing. It uses llOverMyLand to ensure that it doesn't warn or eject wrongly. It works fine unless the range crosses a sim boundary, when it detects *and deals with* agents who are in range, regardless of whose land they are on.

In tests, I've found that the error occurs only when the agent is opposite the land, and not when it is within range but not opposite the land.

Is there a way of dealing with this? Perhaps a way of knowing which sims the object and the agent are in?

There is a bug with llSensorRepeat and a bug with llOverMyLand which come together to give you this problem. I ran into it about a year ago when I was working on a security bot.

You need to sort of double-check that the 'target' is in the same sim, so that you can trust the 'over my land' reading. Use one of the functions that gives you info on the agent, that only work if they are in the same sim. I used llGetAgentInfo as this will return a zero if the agent is not in the same simulator.

-Atashi

Thank you, Atashi. It's appreciated.

You can also use llGetPos() and llDetectedPos() to test whether: 1.) the detected avatar is in the object's sim (x, y, and z components of its location are between 0.0 and 256.0) and possibly 2.) double-check the distance using something like llVecDist() since sensors (maybe only repeated ones?) can sometimes return targets outside their detection range.

an alternative is to run llSensor through the timer event, instead of using llSensorRepeat, which should avoid getting results from off the sim