Difference between revisions of "LlSetLinkAlpha"

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m (added example for fading out and back in an object)
m (broke some lines for better readability on older screens)
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default
 
default
 
{
 
{
    state_entry()
+
    changed (integer change)
    {
+
    {
          integer NumLink = llGetNumberOfPrims();
+
        if (change & CHANGED_LINK)
          llListen(37,"","","");
+
            llResetScript();
          integer i;
+
    }
          for (i=1;i<=NumLink;++i)
+
 
          {
+
    state_entry()
              PrimList += llGetLinkName(i);  
+
    {
          }
+
        integer NumLink = llGetNumberOfPrims();
    }
+
 
    listen( integer channel, string name, key id, string msg)
+
        llListen(37, "", NULL_KEY, "");
    {
+
 
          list temp = llCSV2List(msg);
+
        integer i;
          integer len = llGetListLength (temp);
+
        for (i = 1; i <= NumLink; ++i)
          string Alpha = llToUpper(llList2String(temp,0));
+
            PrimList += llGetLinkName(i);
          integer i;
+
    }
          for (i=1;i<len;++i)
+
 
          {
+
    listen(integer channel, string name, key id, string msg)
                string ThisPrim = llStringTrim(llList2String(temp,i),STRING_TRIM);
+
    {
                integer idx = llListFindList(PrimList, [ThisPrim]);
+
        list temp = llCSV2List(msg);
                if (~idx)
+
        integer len = llGetListLength (temp);
              {
+
        string Alpha = llToUpper(llList2String(temp, 0));
                    if (Alpha == "SHOW")
+
 
                    {
+
        integer i;
                        llSetLinkAlpha(idx+1, 1.0, ALL_SIDES); //Ex:  SHOW,plate,spoon, napkin  <---- makes named prims visible
+
        for (i = 1; i < len; ++i)
                    }
+
        {
                    else if (Alpha == "HIDE")
+
            string ThisPrim = llStringTrim(llList2String(temp, i), STRING_TRIM);
                     {
+
            integer idx = llListFindList(PrimList, [ThisPrim]);
                        llSetLinkAlpha(idx+1,0.0, ALL_SIDES); //Ex:  HIDE, butter knife, glass, fork, spoon  <--- makes named prims transparent
+
            if (~idx)
                    }
+
            {
              }
+
                //Ex:  SHOW,plate,spoon, napkin  <---- makes named prims visible
              else if (llToUpper(ThisPrim) == "ALL")
+
                if (Alpha == "SHOW")
              {
+
                     llSetLinkAlpha(idx + 1, 1.0, ALL_SIDES);
                    if (Alpha == "SHOW")
+
 
                     {
+
                //Ex:  HIDE, butter knife, glass, fork, spoon  <--- makes named prims transparent
                        llSetLinkAlpha(LINK_SET, 1.0, ALL_SIDES); //Ex:  SHOW, ALL <--- makes the entire linkset visible
+
                else if (Alpha == "HIDE")
                    }
+
                llSetLinkAlpha(idx + 1, 0.0, ALL_SIDES);
                    else if (Alpha == "HIDE")
+
            }
                     {
+
            else if (llToUpper(ThisPrim) == "ALL")
                        llSetLinkAlpha(LINK_SET, 0.0, ALL_SIDES); //Ex:  HIDE, All  <--- makes the entire linkset transparent
+
            {
                    }
+
                //Ex:  SHOW, ALL  <--- makes the entire linkset visible
              }
+
                if (Alpha == "SHOW")
                 
+
                     llSetLinkAlpha(LINK_SET, 1.0, ALL_SIDES);
          }
+
 
    }
+
                //Ex:  HIDE, All <--- makes the entire linkset transparent
    changed (integer change)
+
                else if (Alpha == "HIDE")
    {
+
                     llSetLinkAlpha(LINK_SET, 0.0, ALL_SIDES);
          if (change & CHANGED_LINK)
+
 
          {
+
            }
              llResetScript();
+
       
          }
+
        }
    }
+
    }
}</lsl>
+
}
 +
</lsl>
 
|helpers
 
|helpers
 
|also_functions=
 
|also_functions=

Revision as of 09:16, 30 September 2012

Summary

Function: llSetLinkAlpha( integer link, float alpha, integer face );

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
• 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.

Flag Description
LINK_ROOT 1 refers to the root prim in a multi-prim linked set[1]
LINK_SET -1 refers to all prims
LINK_ALL_OTHERS -2 refers to all other prims
Flag Description
LINK_ALL_CHILDREN -3 refers to all children, (everything but the root)
LINK_THIS -4 refers to the prim the script is in

Caveats

  • The function silently fails if its face value indicates a face that does not exist.
All Issues ~ Search JIRA for related Bugs

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 {

   changed (integer change)
   {
       if (change & CHANGED_LINK)
           llResetScript();
   }
   state_entry()
   {
       integer NumLink = llGetNumberOfPrims();
       llListen(37, "", NULL_KEY, "");
       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)
           {
               //Ex:  SHOW,plate,spoon, napkin  <---- makes named prims visible
               if (Alpha == "SHOW")
                   llSetLinkAlpha(idx + 1, 1.0, ALL_SIDES);
               //Ex:  HIDE, butter knife, glass, fork, spoon  <--- makes named prims transparent
               else if (Alpha == "HIDE")
               llSetLinkAlpha(idx + 1, 0.0, ALL_SIDES);
           }
           else if (llToUpper(ThisPrim) == "ALL")
           {
               //Ex:  SHOW, ALL  <--- makes the entire linkset visible
               if (Alpha == "SHOW")
                   llSetLinkAlpha(LINK_SET, 1.0, ALL_SIDES);
               //Ex:  HIDE, All  <--- makes the entire linkset transparent
               else if (Alpha == "HIDE")
                   llSetLinkAlpha(LINK_SET, 0.0, ALL_SIDES);
           }
       
       }
   }

}

</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.

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.
}
See llGetNumberOfPrims for more about counting prims and avatars.

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

Deep Notes

Search JIRA for related Issues

Footnotes

  1. ^ LINK_ROOT does not work on single prim objects. Unless there is an avatar sitting on the object.

Signature

function void llSetLinkAlpha( integer link, float alpha, integer face );