Follower script

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.

<lsl>

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);     
   }

} </lsl> <lsl> //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);
   }

} </lsl>

=============================================================================================================================

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

//FOLLOWER SCRIPT

integer count;
key followee;

vector agent;

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 )
                 {
                     
                    
                     
                   
                   
                    // llRegionSay(-876543,(string)followee);//as you can see the same channel as tellChannel on the assigner script. This in case you need 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();
   }

} </lsl>
And here an example of the other script in the prim contents, that will assign followees
<lsl>

// 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();

} } </lsl>