Event at 30 meters

How do I make an object say something when it gets to a certain height above the ground? I'm looking for an object to say a message when it gets to 40 meters above ground level.

Thanks
Corporal Candour

default {
   state_entry() {
      llSetTimerEvent(0.2);
   }

   timer() {
      vector pos = llGetPos();
      if(pos.z >= (llGround(ZERO_VECTOR) + 30)) {
         llSay(0, "Hello World!");
         llSetTimerEvent(0);
      }
   }
}

This would check every 0.2 sec to see if the object is 30m or higher above ground level and say "Hello World!" and stop checking when it reaches the target height.

Try this:

default
{
      state_entry()
     {
          // Start the timer
          llSetTimerEvent(0.5);  // Deacrease this if you want it to detect the height faster
     }

      timer()
     {
          vector pos = llGetPos();
          if (pos.z >= 40)
          {
               llSay(0, "My message here!");
          }
     }

}