Connecting to the Island

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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

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Introduction to Second Life Scripting
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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/secondli
  fe/Teal/201/50/301)

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How to Create a Script (In Inventory)

• Right click and Select the new script button.
• Cannot run scripts in inventory

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How to Create a Script (In Object)

• Right Click object and select Edit
• Click on the Content tab
• Click New Script

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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

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Primary Built-In Data Types

• Float Same as the float type in C
• Integer - 32-bit signed integer
• String
• Key
• Vector
• List

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Key

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

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Vector

• Simple data structure of 3 floats, written as ltx,
  y, zgt.
• 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 lt0, 0, 1gt
• example.z gives the value of 1.

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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 llList2lttypegt
  functions which take the list and position
  (0-based as parameters)
• Examples
• list example 7, Blue, 0, 1, 2, lt5,5,3gt
• llList2Integer(example, 0) returns 7.

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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.

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Hello World

• default
• state_entry()
• llSay(0, "Hello world!")

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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.

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Default Script

• default
• state_entry()
• llSay(0, "Hello, Avatar!")
• touch_start(integer total_number)
• llSay(0, "Touched.")

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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.

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• default
• state_entry()
• llSay(0, "Hello, Avatar!")
• touch_start(integer total_number)
• integer i 0
• for( i lt total_number i)
• llSay(0, "Touched by
  llDetectedName(i))

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State events

• State_entry Triggered when state first becomes
  active
• State_exit Triggered when state changes and
  becomes inactive

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• default
• state_entry()
• llSay(0, Default State.)
• touch_start(integer num)
• state active
• state_exit()
• llSay(0, Leaving default state.)
• state active
• state_entry()

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• 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)

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• list lastReceivedinteger listenchan
  -800default   state_entry()        
   llListen(listenchan, "", NULL_KEY, "")     
   llSetText("ON", lt1.0, 1.0, 1.0gt, 1.0)    
   listen(integer channel, string name, key id,
  string message)          lastReceived
  llListInsertList(lastReceived, message, 0)   
     integer len llGetListLength(lastReceived) 
       if(len gt 10)                
   lastReceived llList2List(lastReceived, 0,
  9)              integer pos 0     
   string floatText "Last 10 messages\n"     
   for( pos lt 10 pos)                
   floatText llList2String(lastReceived, pos)
  "\n"              llSetText(floatText, lt1.0,
  1.0, 1.0gt, 1.0)      touch_start(integer
  a)          state off   state off 
   state_entry()          llSetText("OFF", lt1.0,
  1.0, 1.0gt, 1.0)      touch_start(integer
  a)          state default   

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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.