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=====Link===== In [[SecondLife Second Life]], several [[prim 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: -All prims, no matter how small, with [[center centers]] within 1[[m]] of each other are linkable. -No prims, no matter how large, can be linked if their centers are further than 32m apart. -In all other cases, the max link distance is related to prim size. 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. [[AndrewLinden Andrew Linden]] [[http://forums.secondlife.com/showthread.php?t=11883 posted]] the exact formula used to calculate the [[position distance]]:[[scale 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 [[script scripting]], but a non-scripting use is ordering behavior of multiple [[llSitTarget 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 "[[group groups]]". This can be confusing when talking about both linked objects and groups of [[user users]]. ===Functions=== |||c **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 [[collision collisions]] with one prim in a linkset trigger collision events in scripts in other prims. || || ##[[llPassTouches]]## || Toggles whether [[touch touches]] with one prim in a linkset trigger touch events in scripts in other prims. || || ##[[llRezAtRoot]]## || [[Rez 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 [[parameter parameters]] (or properties) of any linked prim in one step.||| ===Events=== |||c **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]]##) |||c **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 Functions]] | [[constants Constants]] | [[events Events]] | [[joint Joints]] | [[root Root]] | [[parent Parent]] | [[child Child]]
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