Path update

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/LSL

path_update

Description

Event: path_update( integer type, list reserved ){ ; }

	Event ID
	Delay

Event description goes here.

• integer	type	–	A PU_*, it's the path event type
• list	reserved	–	Reserved; not currently used.

Constants	Value	Description
PU_SLOWDOWN_DISTANCE_REACHED	0x00	Character is near current goal.
PU_GOAL_REACHED	0x01	Character has reached the goal and will stop or choose a new goal (if wandering).
PU_FAILURE_INVALID_START	0x02	Character cannot navigate from the current location - e.g., the character is off the navmesh or too high above it.
PU_FAILURE_INVALID_GOAL	0x03	Goal is not on the navmesh and cannot be reached.
PU_FAILURE_UNREACHABLE	0x04	Goal is no longer reachable for some reason - e.g., an obstacle blocks the path.
PU_FAILURE_TARGET_GONE	0x05	Target (for llPursue or llEvade) can no longer be tracked - e.g., it left the region or is an avatar that is now more than about 30m outside the region.
PU_FAILURE_NO_VALID_DESTINATION	0x06	There's no good place for the character to go - e.g., it is patrolling and all the patrol points are now unreachable.
PU_EVADE_HIDDEN	0x07	Triggered when an llEvade character thinks it has hidden from its pursuer.
PU_EVADE_SPOTTED	0x08	Triggered when an llEvade character switches from hiding to running
PU_FAILURE_NO_NAVMESH	0x09	This is a fatal error reported to a character when there is no navmesh for the region. This usually indicates a server failure and users should file a bug report and include the time and region in which they received this message.
PU_FAILURE_DYNAMIC_PATHFINDING_DISABLED	0x0A	Triggered when a character enters a region with dynamic pathfinding disabled. Dynamic pathfinding can be toggled by estate managers via the 'dynamic_pathfinding' option in the Region Debug Console.
PU_FAILURE_PARCEL_UNREACHABLE	0x0B	Triggered when a character failed to enter a parcel because it is not allowed to enter, e.g. because the parcel is already full or because object entry was disabled after the navmesh was baked.
PU_FAILURE_OTHER	0xF4240	Other failure.

Caveats

• Note that if wandering, the "stop" (PU_GOAL_REACHED) type may never occur as a new goal may be chosen when near (PU_SLOWDOWN_DISTANCE_REACHED) the previous goal.
• When the character cannot navigate from the current position (PU_FAILURE_INVALID_START) llNavigateTo with the FORCE_DIRECT_PATH option may be helpful.

Examples

<lsl> create_wandering_character() { // Clear any previous character behaviors

   llDeleteCharacter();

// MAX_SPEED is @ 20 by default

   llCreateCharacter([
       CHARACTER_MAX_SPEED, 25.0,
       CHARACTER_DESIRED_SPEED, 15.0]);

   llWanderWithin(llGetPos(), <10.0, 10.0,  2.0>, []);

}

list get_pathupdate_failure_info(integer type) {

   if (type == PU_SLOWDOWN_DISTANCE_REACHED)
       return ["Near", FALSE];
   
   if (type == PU_GOAL_REACHED)
       return ["Stopping", FALSE];
   
   if (type == PU_FAILURE_INVALID_START)
       return ["Cannot path find from current location! Attempting "
               + "to go to the center of the region.", TRUE];

   if (type == PU_FAILURE_INVALID_GOAL)
       return ["Goal not on navmesh!", FALSE];
   
   if (type == PU_FAILURE_UNREACHABLE)
       return ["Goal unreachable!", FALSE];
   
   if (type == PU_FAILURE_TARGET_GONE)
       return ["Target gone!", FALSE];
   
   if (type == PU_FAILURE_NO_VALID_DESTINATION)
       return ["No place to go!", FALSE];
   
   if (type ==  PU_EVADE_HIDDEN)
       return ["Hiding from pursuer...", FALSE];
   
   if (type == PU_EVADE_SPOTTED)
       return ["Switched from hiding to running...", FALSE];
   
   if (type ==  PU_FAILURE_NO_NAVMESH)
       return ["Region has no nav mesh..", FALSE];
   
   if (type == PU_FAILURE_DYNAMIC_PATHFINDING_DISABLED)
       return ["Dynamic pathfinding is disabled in this region.", FALSE];

   if (type == PU_FAILURE_PARCEL_UNREACHABLE)
       return ["Parcel entry problem (is the parcel full?).", FALSE];

   if (type == PU_FAILURE_OTHER)
       return ["Hit an unspecified failure", FALSE];

   return ["Unknown failure", FALSE];

}

default {

   on_rez(integer start_param)
   {
       llResetScript();
   }

   state_entry()
   {
       create_wandering_character();
   }

   path_update(integer type, list reserved)
   {
       list params = get_pathupdate_failure_info(type);
       string info = llList2String(params, 0);
       integer /* boolean */ hasToMove = llList2Integer(params, 1);

       llInstantMessage(llGetOwner(), info);
       if (hasToMove)
       {
           vector currentPosition = llGetPos();
           llNavigateTo(<128.0, 128.0, llGround(<128.0, 128.0, 0.0> - currentPosition)>, [FORCE_DIRECT_PATH, TRUE]);
       }
   }

} </lsl>

See Also

Functions

• llCreateCharacter
• llDeleteCharacter
• llEvade
• llExecCharacterCmd
• llGetClosestNavPoint
• llFleeFrom
• llNavigateTo
• llPatrolPoints
• llPursue
• llUpdateCharacter
• llWanderWithin

Deep Notes

History

Date of Release 31/07/2012

Signature
event void path_update( integer type, list reserved );