A.I. in Second Life
Akihiro Eguchi
Why Second Life?
Real world like environment where we
can visually show the demo of our work
 E.g.

◦
◦
◦
◦
◦
◦
Workflow
Ontology
Smart Object
Autonomous Avatar Navigation
Avatar Capable of Logical Reasonings
Chatbots …
Retail Workflow
http://www.youtube.com/watch?v=_KY5LwFy-4s
Smart Objects
http://www.youtube.com/watch?v=Je3As2Vp6gU
Akihiro Eguchi, Craig W. Thompson, "Towards a Semantic
World: Smart Objects in a Virtual World," International
Journal of Computer Information Systems and Industrial
Management, Volume 3, 2011. pp. 905-911.[pdf]
Autonomous Avatar Navigation
http://www.youtube.com/watch?v=kO8FQt7yXcs
Hung Nguyen, Akihiro Eguchi, Daniel Hooten, "In Search of a
Cost Effective Way to Develop Autonomous Floor
Mapping Robots,"9th IEEE International Symposium on Robotic
and Sensors Environments (ROSE 2011), 2011, Montreal, Canada.
Other Related Works

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RPI Demo of Eddie, The Four-Year-Old Avatar
Chatting with an AI in Second Life
Automated Avatars in Second Life
AI patient in second life using scripted prim
and challenge response
Joshua Eno, Craig Thompson, "Virtual (and
Real) World Ontology Services," IEEE Internet
Computing, 16 May. 2011. IEEE computer
Society Digital Library. IEEE Computer Society.
and etc..
How to program in SL
Tutorial of Linden Scripting Language
Create an account
1.
2.
3.
4.
Visit https://join.secondlife.com to
create your account
Send me the account so that I can
register you to U of A. island
Download and Install the Viewer
Search U of A. island and teleport
Learn how to control

Walk

Run

Fly

Control View
+ drag mouse
Creating Objects
Right click any place in the island to Edit
 Choose Create button


Pick one shape and click any location
where you want to place the prim at.
Editing Object
If you click the object, you
can change the xyz
coordinate
 Rotate the object with keep
pressing Ctrl
 Change the size of the
object with keep pressing
Ctrl + Shift

Link Objects together
Shift + click objects you want to
link together
 Then, Ctrl + L to link
 If you want to edit only a part of
linked object, click Edit linked.

STATES
A
"State" in LSL is a section that is running, and
waiting for events.
 Only one state can be active at a time per script.
 Every script must have a default state.
 Except for the default state, each state is defined by
the word STATE followed by the name of the state.
EVENTS
 Events are inside of states.
 When that state is active, those
events wait to
be triggered and run the code inside them.
 "state_entry": triggered by the state being
entered
 "touch_start": triggered when anyone touches
an object.
FUNCTIONS
Functions lay inside of events.
 Built in functions:

◦ all start with two lowercase L's. E.g., llSay(0,
"Hello")
◦ llSay takes arguments of a number and a
string.

User define functions:
◦ You can define own function before default
◦ E.g.:
sayOutloud(string message) {
llSay(0, message);
}
Scripting!

Right Click Object -> edit -> Content ->
New Script -> Open New Script

This script will basically say "Hello, Avatar!"
on the public channel which is 0, and will
then say "Touched." on the public channel
when a user touches or clicks it.
Output in a chat box

10m range:
◦ llWhisper(Channel, "WHISPER STUFF");

20m range
◦ llSay(Channel, "SAY STUFF ");

100m range
◦ llShout(Channel, "SHOUT STUFF");

Anywhere on the region
◦ llRegionSay(Channel, "REGION SAY STUFF");

Use Channel 0 to talk, others (-2147483648
~ 2147483647) for obj-to-obj
communication
LSL variables examples
integer count = 2; //A whole number
float measure = 1.2; //A number with decimal places
string chars = "Lee"; //Any text within " "
list words = ["This", "Is", "A", "List"];
list entries = ["A list may contain many types of values
such as", 2, 1.2, <0.4, 0.8, 1.6>];
vector vec_2 = <1,6,2>; //Generally used for position
as xyz, but can be used to store 3 numbers to be parsed
out later
rotation _rot = <1,2,3,4>; //Can also be used to store 4
numbers to be parsed out later
On/Off Example Using States
default
state off
{
{
state_entry()
state_entry()
{
{
llSay(0, "turning on!");
llSay(0, "turning off!");
llSetColor(<1.0, 1.0, 1.0>, ALL_SIDES);
llSetColor(<0.0, 0.0, 0.0>, ALL_SIDES);
}
}
touch_start(integer total_number)
{
state off; // sets the script to a new "state"
and starts running "state off"
}
}
touch_start(integer total_number)
{
state default;
}
}
If you click, it changes the state and changes the color
Use If /else.
default{
state_entry(){
llSay(0, "Hello, Avatar!");
}
touch_start(integer total_number){
if (llDetectedKey(0) == llGetOwner()){
llSay(0, "Owner Touched.");
}
else{
llSay(0, "Someone Else Touched.");
}
}
}
If the Owner touch, it says “Owner Touched.”
Else it says “Someone Else Touched”
Obj-to-Obj communication
Sender
default
{
state_entry()
{
}
touch_start(integer total_number)
{
llWhisper(5, "SayOne");
}
}

Receiver
default
{
state_entry()
{
llListen(5,"","","");
}
listen(integer channel,string name,
key id, string message)
{
if(message == "SayOne")
{
llSay(0, "One");
}
}

• Object 1 sends a command “SayOne” through the channel 5.
• Object 2 listens to the channel 5, and whenever it receives the message
“SayOne”, It says “One”.
Use PHP
key requestid;
default
{
state_entry(){}
touch_start(integer total_number){
requestid = llHTTPRequest("http://.../a.php?ids=a", [HTTP_METHOD,"GET"],"");
}
http_response(key request_id, integer status, list metadata, string body){
if (request_id == requestid{
llOwnerSay(body);
}
}
}
Send http request to a certain php file and receives the response
If you wanna program in C#

OpenMetaverse foundation provides a C#
library to directly connect to the SL

http://openmetaverse.org/
Useful Links

List of the built-in functions:
◦ http://lslwiki.net/lslwiki/wakka.php?wakka=fun
ctions

LSL tutorials
◦ http://wiki.secondlife.com/wiki/LSL_Tutorial