Transcript A.I. in Second Life
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
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
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Visit https://join.secondlife.com
create your account to 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 ◦ E.g.: } sayOutloud( string message) { llSay (0, message); default
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 float count = 2 ; //A whole number measure = 1.2
; //A number with decimal places string list chars = "Lee" ; //Any text within " " 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_entry() { llSay (0, "turning on!"); } llSetColor (<1.0, 1.0, 1.0>, ALL_SIDES); { state off state_entry() { llSay (0, "turning off!"); 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 key id, string message) name, { 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