Follower script

From Second Life Wiki

This script is based on an extract from the Batman Follower v1.2. It is very basic. If you put it in an object, that object will keep moving toward a position offset from it's owner.

vector offset = < -1, 0, 1>;  //1 meter behind and 1 meter above owner's center.
 
default
{
    state_entry()
    {
        llSetStatus(STATUS_PHYSICS, TRUE);
        // Little pause to allow server to make potentially large linked object physical.
        llSleep(0.1);
        // Look for owner within 20 metres in 360 degree arc every 1 seconds.
        llSensorRepeat("", llGetOwner(), AGENT, 20.0, PI,1.0);
    }
    sensor(integer total_number)
    {   // Owner detected...
        // Get position and rotation
        vector pos   = llDetectedPos(0);
        rotation rot = llDetectedRot(0);
        // Offset back one metre in X and up one metre in Z based on world coordinates.
        // use whatever offset you want.
        vector worldOffset = offset;
        // Offset relative to owner needs a quaternion.
        vector avOffset = offset * rot;
 
        pos += avOffset;       // use the one you want, world or relative to AV.
 
        llMoveToTarget(pos,0.4);     
    }
}

//adding this script as a less laggy and more efficient way of doing the same as above
//this is for havok4's new functions
vector offset = < -1, 0, 1>;  //1 meter behind and 1 meter above owner's center.
 
default
{
    state_entry()
    {
        llSetStatus(STATUS_PHYSICS, TRUE);
        // Little pause to allow server to make potentially large linked object physical.
        llSleep(0.1);
        llSetTimerEvent(1.0);
    }
    timer()
    {
        list det = llGetObjectDetails(llGetOwner(),[OBJECT_POS,OBJECT_ROT]);//this will never fail less owner is not in the same sim
        // Owner detected...
        // Get position and rotation
        vector pos   = llList2Vector(det,0);
        rotation rot = (rotation)llList2String(det,1);
        // Offset back one metre in X and up one metre in Z based on world coordinates.
        // use whatever offset you want.
        vector worldOffset = offset;
        // Offset relative to owner needs a quaternion.
        vector avOffset = offset * rot;
 
        pos += avOffset;       // use the one you want, world or relative to AV.
 
        llMoveToTarget(pos,0.4);
    }
}

---

Less Laggy Follower

--Zelena DeCuir 01:13, 24 June 2012 (PDT)

This following is a bit less laggy, as it does not use sensor. This is completelly separate system from previous example.

//FOLLOWER SCRIPT
 
 integer count;
 key followee;
 
 
 position()
 {
   vector pos = llList2Vector(llGetObjectDetails(followee, [OBJECT_POS]),0);
 
 
                  llSetPos(pos); 
 
                   count += 1;
 
                    if (count > 50)
                    {
                        llResetScript();
                       // llSay(0,"resetting");
                    }
    position2();
    }
 
 
 
 position2()
 {
   vector pos = llList2Vector(llGetObjectDetails(followee, [OBJECT_POS]),0);
 
 
 
 
                   if (pos == <0,0,0> | pos.z > 1000 | pos.z < 800 )//this is to ensure some limitation how far the follower is following. In this case the roaming area is at 900m height. 
//So agents below 800 or above 1000ms are not followed. <0,0,0> means the avatar has teleported to other sim.
                  {
 
                     // llRegionSay(-876543,(string)followee);//as you can see the same channel as tellChannel on the assigner script. This in case some object needs to know we have stopped following and deleted ourselves
                      llSleep(1);
                      llDie();
                    }
 
 
 
                  llSetPos(pos); 
                   count += 1;
 
    position();// yes this script loops between position(); and position2(); 
 
    }
 
 
default
{
  state_entry()
  {
llSetStatus(STATUS_PHYSICS,FALSE);
llSetStatus(STATUS_PHANTOM,TRUE);
      llSleep(3);
      llMessageLinked(LINK_THIS,700,"who",""); //asks another script in contents who is wanted to be followed (maybe the other script has a listener, getting the to-be-followed agent from a central server or something)
     // llSay(0,"reseted");
 
  }
 
  link_message(integer sender_num, integer num, string message, key id)
    {
        if (num == 500)//the other script replies, giving us an agentkey to follow
        {
            // llfolloweeSay("I follow: " + (string) message);
            followee = (key)message;
           // llfolloweeSay("I will follow: " + (string) followee);
           // llSleep(1);
            if (followee != "")
            {
                llMessageLinked(LINK_THIS,600,"got it","");//we tell the other script we got the name and we are ready
 
 
           position();
 
            }
           return;
        }
    }
    on_rez(integer start_param)
    {
        llResetScript();
    }
 
 
}

And here an example of the other script in the prim contents, that will assign followees

// ASSIGNER SCRIPT
 
string agentkey;
integer deleteChannel = -4567; // the channel your whatever tells this follower to delete itself
integer listenID = -97654; // the channel your visitor list send names (to be assigned to be followed) to
integer tellChannel = -86443; //in case there is some object, who needs to know who we are following, this is the channel for it to listen
 
 
default
{
    state_entry()
    {
        agentkey = "";
       llListen(listenID,"",NULL_KEY,"");
 
 
        llSetTimerEvent(5);
    }
 link_message(integer sender_num, integer num, string msg, key id)
    {
         if (num == 700 && msg == "who") //the follower script asks us if we know who to follow
        {
              llMessageLinked(LINK_THIS,500,agentkey, "");
 
            }
 
        if (num == 600 && msg == "got it")//the follower script has told us the agent key is received
        {
                 llListenRemove(listenID);//we have all the data we need, no point listening anylonger (less laggy this way)
                 llSetTimerEvent(0);
 
                state secondary;
        }
 
    }//link_message end
 
 
on_rez(integer start_param)
{
    llResetScript();
}
 
 
timer()
{
   if (agentkey == "")
   {
       llRegionSay(-8765433,"who"); //we repeat this until we know who to follow
       return;
    }
     if (agentkey != "")
   {
 
       llMessageLinked(LINK_THIS,500,agentkey, "");//we pass our knowledge to the other script
 
        llRegionSay(tellChannel,agentkey);//in case your whatever needs to know who we are following
 
              llSleep(6);
       state secondary;
       return;
    }
 
}
 listen( integer channel, string name, key id, string message )
    {
        if (channel == listenID)
        {
             llListenRemove(listenID);
              //   llSay(0,"Listen removed, I´ve heard the command");
           agentkey = message;
            llMessageLinked(LINK_THIS,500, agentkey, "");
             llRegionSay(tellChannel,agentkey);// we've got this one to follow
 
           llSetTimerEvent(5);
           return;
        }
 
 
    }
 
}
 
 
 
state secondary
{
    state_entry()
    {
        llSetTimerEvent(0);
        llListen(deleteChannel,"","","");
    }
 
     listen( integer channel, string name, key id, string message )
    {
        if (channel == deleteChannel && message == agentkey)
        {
 
            llDie();
        }
 
    }
 
 
 
    link_message(integer sender_num, integer num, string msg, key id)
    {
         if (num == 700 && msg == "who")  //the follower script asks us if we know who to follow
        {
              llMessageLinked(LINK_THIS,500,agentkey, "");
 
            }
        if (num == 600 && msg == "got it")
        {
            return;
        }
 
 
}
on_rez(integer start_param)
{
    llResetScript();
}
}