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LlSetLinkAlpha

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Wiki description

If a prim exists in the link set at link, set the Blinn-Phong alpha on face of that prim.

Caveats

  • llSetLinkAlpha will have no visible effect on faces with a PBR material. To work on faces both with and without a PBR material, use one of these snippets:
    • invisible 
      if (llIsLinkGLTFMaterial(LINK_THIS, ALL_SIDES)) {
    llSetLinkGLTFOverrides(LINK_THIS, ALL_SIDES, [OVERRIDE_GLTF_BASE_ALPHA_MODE, PRIM_GLTF_ALPHA_MODE_BLEND, OVERRIDE_GLTF_BASE_ALPHA, 0.0)]);
} else {
    llSetLinkAlpha(LINK_THIS, 0.0, ALL_SIDES);
}
    • visible 
      if (llIsLinkGLTFMaterial(LINK_THIS, ALL_SIDES)) {
    llSetLinkGLTFOverrides(LINK_THIS, ALL_SIDES, [OVERRIDE_GLTF_BASE_ALPHA_MODE, "", OVERRIDE_GLTF_BASE_ALPHA, "")]);
} else {
    llSetLinkAlpha(LINK_THIS, 1.0, ALL_SIDES);
}

Examples

// Make the entire object disappear for 5 seconds

default
{
    touch_start(integer num_detected)
    {
        // transparent
        llSetLinkAlpha(LINK_SET, 0.0, ALL_SIDES);
        llSetTimerEvent(5.0);
    }

    timer()
    {
        // opaque
        llSetLinkAlpha(LINK_SET, 1.0, ALL_SIDES);
        llSetTimerEvent(0.0);
    }
}
// when the object is touched,
// fade it out and back in again

default
{
    touch_start(integer num_detected)
    {
        // fade out
        float alpha = 1.0;
        while (alpha >= 0.0)
        {
            llSetLinkAlpha(LINK_SET, alpha, ALL_SIDES);
            alpha -= 0.001;
        }

        // fade in
        while (alpha < 1.0)
        {
            alpha += 0.001;
            llSetLinkAlpha(LINK_SET, alpha, ALL_SIDES);
        }
    }
}
// Makes selected prims in a linkset become transparent or visible on chat command. Give each prim a unique name.

list PrimList = ["ALL"];
// Start our prim list with a dummy entry, so that the index into this list will correspond directly to the link number
// By making the dummy entry 'ALL' we provide a match for that option too

default
{
    changed (integer change)
    {
	if (change & CHANGED_LINK)
	    llResetScript();
    }

    state_entry()
    {
	integer PrimCount = llGetNumberOfPrims();
	llListen(37, "", NULL_KEY, "");  		    //  listen to chat commands from anyone on channel 37
	integer i;
	for (i = 1; i <= PrimCount; ++i)
	    PrimList += llToUpper(llGetLinkName(i) );  	    // Build a list of upper-case link names, where list position equals link number
    }

    listen(integer channel, string name, key id, string msg)
    {
	list    TempList = llCSV2List( llToUpper(msg) );    // make a list from upper-case version of user command line
	integer ListLen  = llGetListLength (TempList);
	integer alpha    = (llList2String(TempList, 0) == "SHOW");
	// 'SHOW' sets selected prims visible, otherwise set them transparent
	// e.g.  HIDE,PLATE,SPOON,NAPKIN	            <---- makes named prims invisible
	// e.g.  SHOW,ALL                                   <---- makes all prims visible

	integer i;
	for (i = 1; i < ListLen; ++i)
	{
	    string  ThisPrim   = llStringTrim(llList2String(TempList, i), STRING_TRIM);
	    integer LinkNumber = llListFindList(PrimList, [ThisPrim]);
	    if (~LinkNumber)    // i.e. if LinkNumber != -1
	    {
		if (!LinkNumber)
		    LinkNumber = LINK_SET;   	// list position 0 is 'ALL'

		llSetLinkAlpha(LinkNumber, alpha, ALL_SIDES);
	    }
	}
    }
}

See also: functions

llGetAlpha — Gets the prim's alpha
llSetAlpha — Sets the prim's alpha
llGetColor — Gets the prim's color
llSetColor — Sets the prim's color
llSetLinkColor
llSetLinkTexture
llSetLinkPrimitiveParams
PRIM_COLOR — The equivilant parameter for llSetPrimitiveParams
PRIM_GLTF_BASE_COLOR — The equivilant PBR parameter for llSetPrimitiveParams

See also: events

changed — CHANGED_COLOR

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/face

Original shared helper source (conditional wiki logic is not evaluated)
{{LSL Injection Test}}{{#if:

{{#vardefine:header|{{#var:header}}{{#if:{{{nc|}}}{{#pos:{{#var:moded}}|r}}||{{#switch:{{NAMESPACE}}|Template=|User=|[[Category:LSL Face{{#var:lang}}]][[Category:LSL Face{{#var:lang}}/{{#if:{{{return|}}}{{{returns|}}}|Get|Set}}]]}}}}}}

{{#vardefine:ALL_SIDES|{{LSL Const|ALL_SIDES|integer|-1|hex=0xFFFFFFFF}}}}

{{#vardefine:p_{{{1|none}}}_desc|{{LSLGC|Face{{#var:lang}}|face}} number{{#ifeq:{{{notall|}}}|*||<nowiki> </nowiki>or {{#var:ALL_SIDES}}}}}}

{{#vardefine:p_{{{1|none}}}_hover|face number{{#ifeq:{{{notall|}}}|*||<nowiki> </nowiki>or ALL_SIDES (-1)}}}}

{{#ifeq:{{{notall|}}}|*||{{#vardefine:facechoise|If {{LSLP|{{{1|none}}}}} is {{#var:ALL_SIDES}} then the {{#if:{{{2|}}}|{{{2|}}}|function}} {{#if:{{{get|}}}|{{{get|}}}|{{#if:{{{ALL_SIDES|}}}|{{{ALL_SIDES|}}}|works on all sides.}}}}}}}}

{{#vardefine:header_footnote|{{#var:header_footnote}}{{#if:{{{!footer|}}}||{{PBR}}
{{#var:facechoise}}{{PBR}}}}}}

{{#vardefine:caveats|{{#var:caveats}}{{#if:{{{!footer|}}}|
*{{#var:facechoise}}|}}{{#if:{{{return|}}}{{{returns|}}}|
*If {{LSLP|{{{1|none}}}}} indicates a face that does not exist the {{#if:{{{2|}}}|{{{2|}}}}} {{#if:{{{return|}}}|return is {{{return|}}}| returns {{{returns|}}}}}|
*The {{#if:{{{2|}}}|{{{2|}}}|function}} silently fails if its {{LSLP|{{{1|none}}}}} value indicates a face that does not exist.}}}}

}}<noinclude>
{| {{Prettytable}}
|-{{Hl2}}
! #var
! value
|-
{{VarPair|ALL_SIDES}}
|-
{{VarPair|p_{{{1|none}}}_desc}}
|-
{{VarPair|p_{{{1|none}}}_hover}}
|-
{{VarPair|facechoise}}
|-
{{VarPair|header_footnote}}
|-
{{VarPair|caveats}}
|}
</noinclude>

Template:LSL Function/link

Original shared helper source (conditional wiki logic is not evaluated)
<noinclude>{{Multi-lang|category=LSL}}</noinclude>{{LSL Injection Test}}{{#if:

{{#vardefine:header|{{#var:header}}
{{#switch:{{#if:{{{nc|}}}|Template|{{NAMESPACE}}}}|Template=|User=|}}}}

<includeonly>
{{#ifeq:{{#var:article-type}}|event||{{#if:{{#pos:{{#var:moded}}|r}}{{#pos:{{#var:moded}}|u}}||{{#vardefine:hidden-text|{{#var:hidden-text}}
{{LSLC|Link{{#var:lang}}}}{{#if:{{{mode|}}}|{{LSLC|Link/{{{mode}}}{{#var:lang}}}}}}
}}}}}}
</includeonly>

{{#if:{{{nlf|}}}{{{noconst|}}}{{#var:link_constants}}||
{{#vardefine:constants_nb|
{{{!}} style={{{ostyle|}}}
{{!}}- valign="top"
{{!}}
{{{!}} {{Prettytable|style=margin-top:0;}}
{{!}}-{{Hl2}}
! colspan="2" {{!}}Flag
!Description
{{!}}-
{{!}} {{LSL Const|LINK_ROOT|integer|1|c={{{verb|refers to}}} the root prim in a multi-prim linked set}}
{{!}} {{#var:value}}
{{!}} {{{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}}
{{!}}-
{{!}} {{LSL Const|LINK_ALL_OTHERS|integer|-2|c={{{verb|refers to}}} all other prims}}
{{!}} {{#var:value}}
{{!}} {{#var:comment}}}}
{{!}}}
{{!}}
{{{!}} {{Prettytable|style=margin-top:0;}}
{{!}}-{{Hl2}}
! colspan="2" {{!}}Flag
!Description
{{!}}-
{{#if:{{{nogroup|}}}||{{!}} {{LSL Const|LINK_ALL_CHILDREN|integer|-3|c={{{verb|refers to}}} all children, (everything but the root)}}
{{!}} {{#var:value}}
{{!}} {{{verb|refers to}}} all children, (everything but the [[Link#Root_Prim|root]])}}
{{!}}-
{{!}} {{LSL Const|LINK_THIS|integer|-4|c={{{verb|refers to}}} the prim the script is in}}
{{!}} {{#var:value}}
{{!}} {{{verb|refers to}}} the [[prim]] the [[script]] is in
{{!}}}
{{!}}}
{{#var:constants_nb}}}}
{{#vardefine:link_constants|*}}
}}

{{#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}}}}
}}}}

{{#if:{{#var:link_stuff}}||
{{#vardefine:link_stuff|*}}
{{#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.}}}}
}}

}}<noinclude>
{| {{Prettytable}}
|-{{Hl2}}
! #var
! value
|-
{{VarPair|p_{{{1|}}}_desc}}
|-
{{VarPairTable|also_functions}}
|-
{{VarPair|constants_nb}}
|-
{{VarPair|notes}}
|}
</noinclude>

Template:LSL Function/alpha

Original shared helper source (conditional wiki logic is not evaluated)
{{LSL Injection Test}}{{#if:

{{#vardefine:p_{{{1|none}}}_hover|from 0.0 (clear) to 1.0 (solid) (0.0 &lt;{{=}} {{{1|none}}} &lt;{{=}} 1.0)}}
{{#vardefine:p_{{{1|none}}}_desc|from 0.0 (clear) to 1.0 (solid) (0.0 &lt;{{=}} {{LSLP|{{{1|none}}}}} &lt;{{=}} 1.0)}}

{{#vardefine:also_articles|{{#var:also_articles}}
{{LSL DefineRow||{{LSLGC|Alpha|Translucent Color}} {{#switch:{{#if:{{{nc|}}}|Template|{{NAMESPACE}}}}|Template=|User=|{{LSLC|Alpha}}}}}}}}

}}<noinclude>
{| {{Prettytable}}
|-{{Hl2}}
! #var
! value
|-
{{VarPair|p_{{{1|none}}}_desc}}
|-
{{VarPair|p_{{{1|none}}}_hover}}
|-
{{VarPairTable|also_articles}}
|}
</noinclude>
Original wiki source

Some wiki templates and tables need their original context. View this article on the Second Life Wiki. Technical wording and examples are retained from the source; historical guidance may differ from current behavior.