LlSitTarget

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/LSL

SitTarget

llSitTarget

Summary

Function: llSitTarget( vector offset, rotation rot );

238	Function ID
0.0	Forced Delay
10.0	Energy

Set the sit location for the prim. The sit location is relative to the prim's position and rotation.

• vector	offset	–	Additional position for the sit target in local prim coordinates.
• rotation	rot	–	Additional rotation for the sit target relative to the prim rotation.

If offset == <0.0, 0.0, 0.0> then the sit target is removed.

Specification

llSitTarget sets the position for the Agent Target (Advanced -> Character -> View Agent Target). The position of the target is based on rot and the offset^[1].

Caveats

• Once a sit target is removed llAvatarOnSitTarget will only return NULL_KEY.
• Removing or deactivating the script that sets the sit target will not remove the prim's sit target.
  • Sit target is a prim property and not dependent on a script for its continued existence.
• To remove sit target, use the following:

<lsl>llSitTarget(ZERO_VECTOR,ZERO_ROTATION);</lsl>

• Shift-copying a prim with a sit target, without a script that will set the sit target again, will not keep the sit target on the copy. (The copy is in the original location when shift-copying.)
• There is no way to remove the Sit option from the pie menu.
  • It will appear to be removed if the llSetSitText is set to a space " " or similar transparent string.
• Attachments cannot be sat upon.
• rot affects the position of the sit-target in a buggy way way.
  • To correct for the rot bug, simply subtract <0,0,0.4> from the position when rot is zero. See example below.
  • llSetLinkPrimitiveParams is a more difficult work-around.
  • Animations are relative to the Agent Target, but the Agent Target isn't described by the animation.
• llSitTarget does not update position of an already seated avatar.
  • UpdateSitTarget described below works around this problem. It works by converting the sit target information into a link position that is passed along to llSetLinkPrimitiveParams.
• offset is limited to 300.0 meters on each axis. The x, y and z components must be in the range [-300, 300.0]^[2].
  • If they are outside the acceptable range they are rounded to the closest limit.

All Issues ~ Search JIRA for related Bugs

Examples

<lsl>default {

   state_entry()
   {
       llSitTarget(<0.0, 0.0, 1.0>, ZERO_ROTATION); //The vector's components must not all be set to 0 for effect to take place.
   }

}</lsl> <lsl>default //example with work-around for llSetTarget rot bug { //place in any prim large enough to sit on at any angle

           //click once to choose a place to sit, a second time to sit there
   touch_start(integer num)
   {
       vector pos=llDetectedTouchPos(0);       //use touch to set sit target
       vector lft=llDetectedTouchBinormal(0);  //use normals to rotate avatar to
       vector up=llDetectedTouchNormal(0);     //sit upright
       rotation rot=llAxes2Rot(lft%up,lft,up)/llGetRot();  //rotate avatar to stand there
       vector siz=llGetAgentSize(llDetectedKey(0));
       pos += 0.65*siz.z*up;       //this places MY avatars feet close to the surface
       pos = (pos-llGetPos())/llGetRot();  //llSetTarget expects local co-ordinates
       if (rot!=ZERO_ROTATION) pos -=<0,0,0.4>;  //here is the work around
       llSitTarget(pos,rot);
       llSetClickAction(CLICK_ACTION_SIT);   //switch to sit for second click
   }
   changed(integer change)
   {
       if (llAvatarOnSitTarget()==NULL_KEY)    //if they unsit,
           llSetClickAction(CLICK_ACTION_TOUCH);   //go back to click mode
   }

}</lsl>

Useful Snippets

UpdateSitTarget

<lsl>//Sets / Updates the sit target moving the avatar on it if necessary. UpdateSitTarget(vector pos, rotation rot) {//Using this while the object is moving may give unpredictable results.

   llSitTarget(pos, rot);//Set the sit target
   key user = llAvatarOnSitTarget();
   if(user)//true if there is a user seated on the sittarget, if so update their position
   {
       vector size = llGetAgentSize(user);
       if(size)//This tests to make sure the user really exists.
       {
           //We need to make the position and rotation local to the current prim
           rotation localrot = ZERO_ROTATION;
           vector localpos = ZERO_VECTOR;
           if(llGetLinkNumber() > 1)//only need the local rot if it's not the root.
           {
               localrot = llGetLocalRot();
               localpos = llGetLocalPos();
           }
           pos.z += 0.4;
           integer linkNum = llGetNumberOfPrims();
           do{
               if(user == llGetLinkKey( linkNum ))//just checking to make sure the index is valid.
               {
                   llSetLinkPrimitiveParams(linkNum,
                                           [PRIM_POSITION, ((pos - (llRot2Up(rot) * size.z * 0.02638)) * localrot) + localpos,
                                            PRIM_ROTATION, rot * localrot / llGetRootRotation()]);
                   jump end;//cheaper but a tad slower then return
               }
           }while( --linkNum );
       }
       else
       {//It is rare that the sit target will bork but it does happen, this can help to fix it.
           llUnSit(user);
       }
   }
   @end;

}//Written by Strife Onizuka, size adjustment provided by Escort DeFarge</lsl>

GetSitTarget

<lsl>list GetSitTarget(integer prim, key av) {//WARNING: llGetObjectDetails can introduce an error that goes as far as the 5th decimal place!

//This is highly unlikely to be ever noticed unless compounded over time.
//Do not use while moving (like in a moving vehicle)!!!
   vector tp = llGetAgentSize(av);
   if(tp)
   {
       if(prim == LINK_THIS)//llGetLinkKey doesn't like LINK_THIS
           prim = llGetLinkNumber();
       
       list details = [OBJECT_POS, OBJECT_ROT];
       rotation f = llList2Rot(details = (llGetObjectDetails(llGetLinkKey(prim), details) + llGetObjectDetails(av, details)), 1);
       rotation r = llList2Rot(details, 3) / f;

       return [((llList2Vector(details, 2) - llList2Vector(details, 0)) / f) + (llRot2Up(r) * tp.z * 0.02638) - <0.0, 0.0, 0.4>, r];
   }
   return [];

}//Written by Strife Onizuka</lsl>

See Also

Events

•

changed

Functions

•	llSetSitText
•	llAvatarOnSitTarget
•	llUnSit

Deep Notes

Search JIRA for related Issues

Footnotes

1. ^ It is widely considered that the rot should not affect the position, unfortunately the sit target code is a  lava-flow. ~ SVC-2277
2. ^ The ranges in this article are written in Interval Notation.

Signature
function void llSitTarget( vector offset, rotation rot );