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Connecting to the Island

Ensure you are in the UA CSCE Artificial Intelligence group and open the map to find the University of Arkansas. Learn Second Life scripting resources and basics, including events, data types, and chat output functions.

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Connecting to the Island

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  1. Connecting to the Island • Ensure you are in the UA CSCE Artificial Intelligence group • Open the Map tap • Type University of Arkansas into the Search box and hit the Search button. • Click University of Arkansas in the results • Click Teleport

  2. Introduction to Second Life Scripting

  3. Resources • http://wiki.secondlife.com/wiki/LSL_Portal • http://lslwiki.net/lslwiki/wakka.php • Inside of Second Life: • Linden Script Tutorial Group • The Particle Laboratory (http://slurl.com/secondlife/Teal/201/50/301)

  4. How to Create a Script (In Inventory) • Right click and Select the new script button. • Cannot run scripts in inventory

  5. How to Create a Script (In Object) • Right Click object and select Edit • Click on the Content tab • Click “New Script”

  6. LSL Basics • Event and state driven • Single Threaded • Next event will not be processed until current event finishes. • Includes logic and looping constructs such as for, if, while, and do-while

  7. Primary Built-In Data Types • Float – Same as the float type in C • Integer - 32-bit signed integer • String • Key • Vector • List

  8. Key • Unique identifier for just about any object in Second Life • Contains hexidecimal characters seperated by dashes • Example: • a822ff2b-ff02-461d-b45d-dcd10a2de0c2

  9. Vector • Simple data structure of 3 floats, written as <x, y, z>. • Used to hold position, velocity, and color. • Individual elements can be accessed by using the .x, .y, and .z after the variable name. • For color: • X = Red • Y = Green • Z = Blue • Examples: • vector example = <0, 0, 1> • example.z gives the value of 1.

  10. List • Generic Container that can hold any number of elements of any type. • Grows dynamically up to maximum amount of memory • All element access is done through llList2<type> functions which take the list and position (0-based as parameters) • Examples: • list example = [7, “Blue”, [0, 1, 2], <5,5,3>]; • llList2Integer(example, 0) returns 7.

  11. States • Every script must have a default state. • All objects begin in the default state. • Additional states can be declared using the state keyword. • Event functions are for that specific state. No direct way to have a event handler that works in all states.

  12. Hello World default { state_entry() { llSay(0, "Hello world!"); } }

  13. Basic Chat Output Functions • All have two parameters – Output Channel (Integer) and Message (String) • Different functions have different ranges: • llWhisper – 10 meters • llSay – 20 meters • llShout – 100 meters • llRegionSay – Entire island (but not on received on clients) • Chat Channel 0 is the channel that is displayed in the Second Life client.

  14. Default Script default { state_entry() { llSay(0, "Hello, Avatar!"); } touch_start(integer total_number) { llSay(0, "Touched."); } }

  15. Events • Most events can be triggered multiple times per simulation clock cycle. • For the touch_start event, the total_number represents the total avatars that have started touching the object. • Information for each avatar or object detected can be obtained through the llDetected functions.

  16. default { state_entry() { llSay(0, "Hello, Avatar!"); } touch_start(integer total_number) { integer i = 0; for(; i < total_number; ++i) { llSay(0, "Touched by “ + llDetectedName(i)); } } }

  17. State events • State_entry – Triggered when state first becomes active • State_exit – Triggered when state changes and becomes inactive

  18. default { state_entry() { llSay(0, “Default State.”); } touch_start(integer num) { state active; } state_exit() { llSay(0, “Leaving default state.”); } } state active { state_entry() { llSay(0, “Activated”); } touch_start(integer num) { llSay(0, “Touched.”); } }

  19. integer relaychan = -1356; default { state_entry() { llListen(relaychan, “”, NULL_KEY, “”); //Channel, Name, Key, Message filters llListen(0, “”, NULL_KEY, “”); } listen(integer chan, string name, key id, string message) { if(chan == relaychan) { llSay(0, message); } else { llShout(relaychan, name + “: ” + message); } } }

  20. list lastReceived;integer listenchan = -800;default{   state_entry()   {       llListen(listenchan, "", NULL_KEY, "");       llSetText("ON", <1.0, 1.0, 1.0>, 1.0);   }   listen(integer channel, string name, key id, string message)   {       lastReceived = llListInsertList(lastReceived, [message], 0);       integer len = llGetListLength(lastReceived);       if(len > 10)       {           lastReceived = llList2List(lastReceived, 0, 9);       }       integer pos = 0;       string floatText = "Last 10 messages:\n";       for(; pos < 10; ++pos)       {           floatText += llList2String(lastReceived, pos) + "\n";       }       llSetText(floatText, <1.0, 1.0, 1.0>, 1.0);   }   touch_start(integer a)   {       state off;   }}state off{   state_entry()   {       llSetText("OFF", <1.0, 1.0, 1.0>, 1.0);   }   touch_start(integer a)   {       state default;   }}

  21. Lab • Verify that you can teleport to the Second Life island • Try out the example scripts. • Create a script to use llShout to say your avatar name(s) on channel -800.

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