Joining the Developer Group

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Joining the Developer Group

• Register an account and select an avatar name at
  www.secondlife.com
• Email your avatar name to cwt_at_uark.edu (or as
  otherwise directed)
• Look for the invitation dialog box and click Join

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Connecting to the Island

• Open the Map tab
• Type University of Arkansas into the Search box
  and click 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//lslwiki.net/lslwiki/wakka.php
• http//wiki.secondlife.com/wiki/LSL_Portal
• http//vw.ddns.uark.edu/mediawiki
• Resident Experts
• Casey Bailey Dillon Potez
• Keith Perkins Thinker51 Brandenburg
• Nicholas Farrer Anon Frog

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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

• Java-like syntax, but not object oriented
• Strongly typed
• Event and state driven
• 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
• Rotation
• List

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Key

• Unique identifier for just about any object in
  Second Life (UUID/GUID)
• Contains hexadecimal characters separated 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, 1.0gt
• example.z gives the value of 1.0

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Rotation

• Simple data structure of 4 floats, written as
  ltx, y, z, sgt.
• Used to hold rotation information as a quaternion
  See http//en.wikipedia.org/wiki/Quaternion
• Individual elements can be accessed by using the
  .x, .y, .z, and .s after the variable name
• Examples
• rotation example lt0, 0, 0, 1.0gt
• example.s gives the value of 1.0

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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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Variable Scope

• Global variables are declared outside of all
  states
• Local variables are declared inside of functions
• There are no state variables (variables declared
  within a state but outside of all functions)

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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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Lab

• Verify that you can teleport to the Second Life
  island
• Get added to the development group
• Build an object, add a script, test it out