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In Second Life, several prims can be linked together into a "linked set" (also "link" or "linkset") that act as (or, by its definition, are) a single object. Linked sets have one parent prim and 1 or more child prims. Linksets are limited to 256 prims.


Notice : It seems that a linkset can only have 255 prims + 1 sitting avatar, not 256 prims.

Link Distance


A set of prims needn't be contiguous to be linkable. They can overlap, or they can be completely separated from each other; what you see has little bearing on whether you can link them. What does matter is their size and their relative distance, measured from center to center. The set can only be linked if:


Illuminating example: I could not link a tower of five contiguous parts that was just over 40m tall. But I succeeded in linking its inner parts. Afterward, I was able to link its bottom and top parts to the inner, pre-linked segment.

Andrew Linden posted the exact formula used to calculate the distance:size ratio of prims.

Order Of Objects; The Root Prim


Second Life retains data on the specific order of parent and child objects within a linked set. The last selected prim is the parent/root. (This is probably mostly useful in scripting, but a non-scripting use is ordering behavior of multiple sit targets in a linkset.) In objects with only one prim, the object's link number is 0 (unless there is an avatar sitting on it; then it is 1). In objects with multiple prims, the root is 1 and children start at 2. So, in a 2-prim object, llGetLinkNumber would return 1 in the parent/root and 2 in the first (and only) child. Avatars seated on an object are assigned link numbers at the end of the linked set in the order seated.

If a script is in a child object's inventory, it may return different data than an object contained in the parent. The most notable example is in llSensor.

Note: Linked objects are sometimes erroneously referred to as "groups". This can be confusing when talking about both linked objects and groups of users.

Functions

Function Description
llBreakLink Delinks a specified prim from the linkset.
llBreakAllLinks Delinks all prims in the linkset.
llCreateLink Links an object to the linkset.
llDetectedLinkNumber Returns the link number of the prim a touch or collision event was triggered by.
llGetLinkKey Gets the key of a specified prim in the linkset.
llGetLinkName Gets the name of a specified prim in the linkset.
llGetLinkNumber Gets the link number of the prim containing the script.
llGetLocalPos Gets the position of the child prim relative to the root prim.
llGetLocalRot Gets the rotation of the child prim relative to the root prim.
llSetLocalRot Sets the rotation of the child prim relative to the root prim.
llGetNumberOfPrims Returns the total number of prims in the object.
llGetPos Gets the position of the prim in region coordinates.
llSetPos In a child prim, sets position relative to the root prim.
llGetRootPosition Gets the position of the root prim in region coordinates.
llGetRootRotation Gets the rotation of the root prim.
llMessageLinked Sends a message to specified prims to be recieved by other scripts using the link_message event.
llPassCollisions Toggles whether collisions with one prim in a linkset trigger collision events in scripts in other prims.
llPassTouches Toggles whether touches with one prim in a linkset trigger touch events in scripts in other prims.
llRezAtRoot Rezzes an object at the root prim's coordinates.
llSetLinkAlpha Sets the alpha of any specified prim in the object.
llSetLinkColor Sets the color of any specified prim in the object.
llSetLinkTexture Sets the texture of any specified prim in the object
llSetLinkPrimitiveParams Sets the parameters (or properties) of any linked prim in one step.

Events

Event Description
link_message Triggered when a message sent by llMessageLinked is recieved.
changed Triggered when a prim is linked or delinked.

Constants

(used by the functions llMessageLinked, llSetLinkAlpha, and llSetLinkColor)
Constant Value Description
LINK_ROOT 1 The root prim in a linked set (but not in a single prim, which is 0)
LINK_SET -1 All prims in the object.
LINK_ALL_OTHERS -2 All other prims in the object besides the prim the function is in.
LINK_ALL_CHILDREN -3 All child prims in the object.
LINK_THIS -4 The prim the script is in.

Q: Is there a way to set the texture of another prim in the linkset?
A: Yes, use llSetLinkTexture.

Q: Can I change the order of prims in a linked object without delinking and relinking it?
A: No.


Functions | Constants | Events | Joints | Root | Parent | Child
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