Ghost Detector

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The following script detects "ghosted" avatars within sensor range.

Avatars sometimes become ghosted due to a longstanding server bug. Ghosted avatars are motionless and phantom: other avatars can walk through them without colliding. A ghosted avatar cannot be teleported home using estate management tools; the error is Could not find user to teleport home / estate owner request failed: teleporthomeuser. Their visual appearance may be partially or completely grayed; a cloud; or invisible. Although seemingly present (and detectable by llSensor and visible on the Mini-Map), ghosted avatars are in fact usually logged out and unable to log in (although sometimes they will be logged in on some other region). The only way to "rescue" a ghosted avatar is to restart the region it is in.

This code takes advantage of the fact that llKey2Name returns an empty string for ghosted avatars.

default
{
    touch_start(integer total_number)
    {
        llSensor("", NULL_KEY, AGENT, 96.0, PI );
    }
 
    sensor(integer num_detected) {
        integer i;
        for (i = 0; i < num_detected; i++) {
            key k = llDetectedKey(i);
            vector pos = llDetectedPos(i);
 
            if (llKey2Name(k) == "") {
                llOwnerSay("Ghosted avatar: " +
                 "secondlife:///app/agent/" + (string)k + "/about" +
                 " at secondlife://" + llEscapeURL(llGetRegionName()) + "/" +
                 (string)llRound(pos.x) + "/" +
                 (string)llRound(pos.y) + "/" +
                 (string)llRound(pos.z) + "/");
            }
        }
    }
 
    no_sensor() {
        llOwnerSay("...");
    }
}