LlAvatarOnLinkSitTarget

Function notes

If the prim lacks a sit target or there is no avatar sitting on the prim, then NULL_KEY is returned.

Return value notes

Returns a key that is the UUID of the user seated on the prim.

Caveats

A prim does not have a sit target unless llSitTarget/llLinkSitTarget has been called with a nonzero vector as the first argument.
The root link number changes from zero to one when someone sits on an unlinked prim.
- So (llAvatarOnLinkSitTarget( 0) == NULL_KEY) is always true. Nobody ever sits on link number 0

Examples

// Unseat a second avatar on this object

string one_sitter_message = "Hey!  I don't take passengers.";

default
{
    state_entry()
    {
        // Sit target 1 is your sit target on the root prim
        llLinkSitTarget(1,<0.0,0.0,0.5>,ZERO_ROTATION);
        // Sit target 2 is the target on child prim 2, a small transparent prim inside the object
        llLinkSitTarget(2, <0.0,0.0,0.1>,ZERO_ROTATION);
    }

    changed(integer change)
    {
        if (change & CHANGED_LINK)
        {
            // An avatar on child prim 2, whether seated by choice or by redirection after sit target 1 is occupied, will be unseated.
            if (llAvatarOnLinkSitTarget(2))
            {
                llRegionSayTo(llAvatarOnLinkSitTarget(2),PUBLIC_CHANNEL, one_sitter_message);
                llUnSit(llAvatarOnLinkSitTarget(2));
            }
            // Now pay attention to the avatar on the root prim.                                
            key agent = llAvatarOnLinkSitTarget(1);
            if (agent)
            {
                llRegionSayTo(agent,PUBLIC_CHANNEL,"Hello!");
            }
        }
    }
}

Notes

The position of an avatar on a sit target can be determined with the use of llGetObjectDetails (see llSitTarget for an example).

If an object has multiple seats (each seat has a script that sets a sit target with llSitTarget, 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.

History

Date of Release 10/08/2011

Shared wiki helpers

The original page also injects shared parameter notes, caveats or issue information through these helpers. Their conditional MediaWiki logic is not reproduced here; inspect the preserved helper source for additional material.

Template:LSL Function/link

Original shared helper source (conditional wiki logic is not evaluated)

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{{{!}} {{Prettytable|style=margin-top:0;}}
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! colspan="2" {{!}}Flag
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{{!}} {{LSL Const|LINK_ROOT|integer|1|c={{{verb|refers to}}} the root prim in a multi-prim linked set}}
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{{!}} {{{verb|refers to}}} the [[Link#Root_Prim|root]] prim in a multi-prim linked set{{Footnote|handle=LINK_ROOT|LINK_ROOT does not work on single [[prim]] [[object|objects]]. Unless there is an avatar sitting on the [[object]].}}
{{#if:{{{nogroup|}}}||{{!}}-
{{!}} {{LSL Const|LINK_SET|integer|-1|c={{{verb|refers to}}} all prims}}
{{!}} {{#var:value}}
{{!}} {{#var:comment}}
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{{!}} {{LSL Const|LINK_ALL_OTHERS|integer|-2|c={{{verb|refers to}}} all other prims}}
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{{#if:{{{nogroup|}}}||{{!}} {{LSL Const|LINK_ALL_CHILDREN|integer|-3|c={{{verb|refers to}}} all children, (everything but the root)}}
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{{!}} {{{verb|refers to}}} all children, (everything but the [[Link#Root_Prim|root]])}}
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{{!}} {{LSL Const|LINK_THIS|integer|-4|c={{{verb|refers to}}} the prim the script is in}}
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{{!}} {{{verb|refers to}}} the [[prim]] the [[script]] is in
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{{#vardefine:link_constants|*}}
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{{#vardefine:p_{{{1|}}}_desc|[[Link]] number ({{#if:{{{nounlinked|}}}||0: {{HoverText|unlinked|When an object is made up of only one prim, and there are no avatars seated upon it, the link number of the (root) prim is zero.}},&#32;}}1: {{HoverText|[[Link#Root_Prim|root]] prim|When an object is made up of multiple prims or there is an avatar seated upon the object, the root prim's link number is one}}, &gt;1: child prims{{#if:{{{noavatar|}}}||&#32;and {{HoverText|seated avatars|Avatars sitting on objects are assigned link numbers. They are always greater than prim link numbers.}}}}) {{#if:{{{nlf|}}}||or a <code>LINK_*</code> [[flag]]}}{{{2|}}}&#32;}}
{{#vardefine:p_{{{1|}}}_hover|Link number ({{#if:{{{nounlinked|}}}||0: unlinked,&#32;}}1: root prim, &gt;1: child prims{{#if:{{{noavatar|}}}||&#32;and seated avatars}}) {{#if:{{{nlf|}}}||or a LINK_* flag}}{{#if:{{{3|}}}|{{{3|}}}|{{{2|}}}}}&#32;}}

{{#if:{{{nocaveats|}}}||{{#if:{{{noavatar|}}}|
{{#vardefine:caveats|
*{{LSLP|{{{1|}}}}} cannot be a {{HoverText|seated avatar|Avatars sitting on objects are assigned link numbers. They are always greater than link numbers of prims.}}.
{{#var:caveats}}}}
}}{{#if:{{{nogroup|}}}|
{{#vardefine:caveats|
*{{LSLP|{{{1|}}}}} needs to be either an actual [[llGetLinkNumber|link number]] or a link constants that equate to a single prim, such as [[LINK_ROOT]] and [[LINK_THIS]].
**[[LINK_SET]], [[LINK_ALL_CHILDREN]] and [[LINK_ALL_OTHERS]] will not work.
{{#var:caveats}}}}
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{{#if:{{#var:link_stuff}}||
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{{#vardefine:notes|
<h3>Link Numbers</h3>
Each prim that makes up an [[object]] has an address, a link number. To access a specific [[prim]] in the [[object]], the [[prim]]'s link number must be known. In addition to [[prim|prims]] having link numbers, avatars seated upon the [[object]] do as well.
* If an [[object]] consists of only one [[prim]], and there are no avatars seated upon it, the ([[Link#Root_Prim|root]]) [[prim]]'s link number is zero.
* However, if the [[object]] is made up of multiple prims or there is an avatar seated upon the [[object]], the [[Link#Root_Prim|root]] [[prim]]'s link number is one.

When an avatar sits on an [[object]], it is added to the end of the link set and will have the largest link number. In addition to this, while an avatar is seated upon an object, the object is unable to link or unlink prims without [[llUnSit|unseating]] all avatars first.
<h4>Counting Prims & Avatars</h4>
There are two functions of interest when trying to find the number of prims and avatars on an object.
* <code>[[llGetNumberOfPrims]]()</code> - Returns the number of [[prim|prims]] and seated avatars.
* <code>[[llGetObjectPrimCount]]([[llGetKey]]())</code> - Returns only the number of [[prim|prims]] in the [[object]] but will return zero for attachments.

<syntaxhighlight lang="lsl2">integer GetPrimCount() { //always returns only the number of prims
    if(llGetAttached())//Is it attached?
        return llGetNumberOfPrims();//returns avatars and prims but attachments can't be sat on.
    return llGetObjectPrimCount(llGetKey());//returns only prims but won't work on attachments.
}</syntaxhighlight>See [[llGetNumberOfPrims]] for more about counting prims and avatars.

<h4>Errata</h4>
If a script located in a [[Link#Child_Prim|child]] prim erroneously attempts to access link 0, it will get or set the property of the linkset's [[Link#Root_Prim|root]] prim.  This bug ({{jira|BUG-5049}}) is preserved for broken legacy scripts. {{PBR}}
{{#var:notes}}
}}

{{#vardefine:also_functions|{{#var:also_functions}}
{{LSL DefineRow||[[llGetLinkNumber]]|Returns the link number of the [[prim]] the script is in.}}}}
}}

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LlAvatarOnLinkSitTarget

Function notes

Return value notes

Caveats

Examples

Notes

See also: functions

See also: events

See also: articles

History

Shared wiki helpers