LlSitTarget

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/LSL

SitTarget

llSitTarget

Summary

Function: llSitTarget( vector offset, rotation rot );

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:

llSitTarget(ZERO_VECTOR, ZERO_ROTATION);

• 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 menu.
  • It will appear to be removed if the llSetSitText is set to a space " " or similar transparent string.
• Attachments cannot be sat upon (see SVC-6100 to vote for such a feature).
• rot affects the position of the sit target in a buggy 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.
• If an object has multiple seats (each seat has a script that sets a sit target, or the linkset has a script that assigns several llLinkSitTargets), the following method determines which sit target an avatar ends up at:
  • If the prim that is clicked on has a sit target and that sit target is not full, that sit target is used.
  • If the prim that is clicked on has no sit target, and one or more other linked prims have sit targets that are not full, the sit target of the prim with the lowest link number will be used.

Examples

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.
    }
}

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, 0.0, 0.4>;  //here is the workaround
        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
    }
}

Useful Snippets

UpdateSitTarget

This function is primarily for use in objects that need to move seated avatars. It is most useful in poseballs, furniture and vehicles (just not while they are moving). There is also a UpdateLinkSitTarget() version of the function that can be found at: User:Strife_Onizuka/UpdateLinkSitTarget.

//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 sit target; 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();
            }
            integer linkNum = llGetNumberOfPrims();
            do
			{
                if (user == llGetLinkKey(linkNum))//just checking to make sure the index is valid.
                {
                    //<0.008906, -0.049831, 0.088967> are the coefficients for a parabolic curve that best fits real avatars. It is not a perfect fit.
                    float fAdjust = ((((0.008906 * size.z) + -0.049831) * size.z) + 0.088967) * size.z;
                    llSetLinkPrimitiveParamsFast(linkNum,
                        [PRIM_POS_LOCAL, (pos + <0.0, 0.0, 0.4> - (llRot2Up(rot) * fAdjust)) * localrot + localpos,
                         PRIM_ROT_LOCAL, rot * localrot]);
                    jump end;//cheaper but a tad slower than return
                }
            } while(--linkNum);
        }
        else
        {//It is rare that the sit target will bork, but if it does happen, this can help to fix it.
            llUnSit(user);
        }
    }
    @end;
}//Written by Strife Onizuka, size adjustment and improvements provided by Talarus Luan

GetSitTarget

This function is primarily for configuring sittargets for furniture. Sit an avatar on a box, position the box where you want them and use this function to read the sittarget so that it can be coded into the furniture. See /GetSitTarget for an example.

list GetSitTarget(integer prim, key av)
{//WARNING: This function is very good but not perfect. Do not repeatedly pass GetSitTarget to llSitTarget or UpdateSitTarget.
 //Do not use this on moving avatars or objects, the results will very likely be wrong.
    vector tp = llGetAgentSize(av);
    if (tp)
    {//llGetObjectDetails is used so the av is not required to be seated on the object with the sit target.
        list details = llGetLinkPrimitiveParams(prim, [PRIM_POSITION, PRIM_ROTATION]) + llGetObjectDetails(av, [OBJECT_POS, OBJECT_ROT]);
        rotation f = llList2Rot(details, 1);
        rotation r = llList2Rot(details, 3) / f;
        float fAdjust = ((((0.008906 * tp.z) + -0.049831) * tp.z) + 0.088967) * tp.z;
        return [((llList2Vector(details, 2) - llList2Vector(details, 0)) / f) + (llRot2Up(r) * fAdjust) - <0.0, 0.0, 0.4>, r];
    }
    return [];
}//Written by Strife Onizuka, size adjustment provided by Talarus Luan

See Also

Events

•

changed

Functions

•	llLinkSitTarget
•	llSetSitText
•	llAvatarOnSitTarget
•	llAvatarOnLinkSitTarget
•	llUnSit

Deep Notes

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 );

Haiku
The seats all taken. Perch on the tailgate I try. On the hood I sit.