llSetLinkAlpha
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Summary
Function: llSetLinkAlpha( integer link, float alpha, integer face );| 0.0 | Forced Delay |
| 10.0 | Energy |
If a prim exists in the link set at link, set alpha on face of that prim.
| • integer | link | – | Link number (0: unlinked, 1: root prim, >1: child prims and seated avatars) or a LINK_* flag
|
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| • float | alpha | – | from 0.0 (clear) to 1.0 (solid) (0.0 <= alpha <= 1.0) | |
| • integer | face | – | face number or ALL_SIDES |
If face is ALL_SIDES then the function works on all sides.
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Caveats
- The function silently fails if its face value indicates a face that does not exist.
Examples
<lsl> // 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);
}
} </lsl> <lsl> // when the object was touched // fade it out and back in again
default {
touch_start(integer num_detected)
{
// set whole object opaque (full alpha)
llSetLinkAlpha(LINK_SET, (float)TRUE, ALL_SIDES);
// fade out
float alpha = 1.0;
while (0.0 < alpha)
{
alpha -= 0.001;
llSetLinkAlpha(LINK_SET, alpha, ALL_SIDES);
}
// set whole object transparent (zero alpha)
llSetLinkAlpha(LINK_SET, (float)FALSE, ALL_SIDES;
// fade in
alpha = 0.0;
while (alpha < 1.0)
{
alpha += 0.001;
llSetLinkAlpha(LINK_SET, alpha, ALL_SIDES);
}
// set whole object opaque (full alpha)
llSetLinkAlpha(LINK_SET, (float)TRUE, ALL_SIDES);
}
} </lsl> <lsl> // Makes selected prims in a linkset become transparent or visible on chat command. Give each prim a unique name.
list PrimList; default {
state_entry()
{
integer NumLink = llGetNumberOfPrims();
llListen(37,"","","");
integer i;
for (i=1;i<=NumLink;++i)
{
PrimList += llGetLinkName(i);
}
}
listen( integer channel, string name, key id, string msg)
{
list temp = llCSV2List(msg);
integer len = llGetListLength (temp);
string Alpha = llToUpper(llList2String(temp,0));
integer i;
for (i=1;i<len;++i)
{
string ThisPrim = llStringTrim(llList2String(temp,i),STRING_TRIM);
integer idx = llListFindList(PrimList, [ThisPrim]);
if (~idx)
{
if (Alpha == "SHOW")
{
llSetLinkAlpha(idx+1, 1.0, ALL_SIDES); //Ex: SHOW,plate,spoon, napkin <---- makes named prims visible
}
else if (Alpha == "HIDE")
{
llSetLinkAlpha(idx+1,0.0, ALL_SIDES); //Ex: HIDE, butter knife, glass, fork, spoon <--- makes named prims transparent
}
}
else if (llToUpper(ThisPrim) == "ALL")
{
if (Alpha == "SHOW")
{
llSetLinkAlpha(LINK_SET, 1.0, ALL_SIDES); //Ex: SHOW, ALL <--- makes the entire linkset visible
}
else if (Alpha == "HIDE")
{
llSetLinkAlpha(LINK_SET, 0.0, ALL_SIDES); //Ex: HIDE, All <--- makes the entire linkset transparent
}
}
}
}
changed (integer change)
{
if (change & CHANGED_LINK)
{
llResetScript();
}
}
}</lsl>
Notes
Link Numbers
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 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 (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 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 unseating all avatars first.
Counting Prims & Avatars
There are two functions of interest when trying to find the number of prims and avatars on an object.
llGetNumberOfPrims()- Returns the number of prims and seated avatars.llGetObjectPrimCount(llGetKey())- Returns only the number of prims in the object but will return zero for attachments.
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.
}
Errata
If a script located in a child prim erroneously attempts to access link 0, it will get or set the property of the linkset's root prim. This bug (BUG-5049) is preserved for broken legacy scripts.
See Also
Events
| • | changed | – | CHANGED_COLOR |
Functions
| • | llGetLinkNumber | – | Returns the link number of the prim the script is in. | |
| • | 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 |
Articles
| • | Translucent Color |