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3D Web Agents in Distributed Logic Programming

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Title: 3D Web Agents in Distributed Logic Programming


1
3D Web Agents in Distributed Logic Programming
  • Zhisheng Huang, Anton Eliens and Cees Visser
  • huang,eliens,ctv_at_cs.vu.nl
  • Intelligent Multimedia Group
  • Vrije Universiteit
  • The Netherlands

2
  • 3D Web Agents are intelligent agents whose
    avatars can interact with users via Web
    browsers. These Web-based 3D avatars are usually
    constructed by means of the Virtual Reality
    Modeling Language VRML.

3
Outline of This Talk
  • 1 Main Features of 3D Web Agents
  • 2 Requirements of Programming/Specification
    Languages for 3D Web Agents
  • 3 Distributed Logic Programming Language (DLP)
    for 3D Web Agents
  • 4 Examples
  • 4.1 VRML-based Multi-User Soccer Game
  • 4.2 Facial Animation in DLP
  • 5 Conclusions

4
Main Features of 3D Web Agents
  • Cross-Platform Accessible for any Web browser
    with a VRML viewer
  • Mobility Accessible from anywhere over the
    Web
  • Reactivity in Real Time Can react in real time.
    No heavy rendering delay
  • Flexibility Rule-based knowledge representation
    makes the changes of behaviors rather easy. Need
    no re-programming.

5
Requirements of General Programming/Specification
Languages for 3D Web Agents
  • VRML EAI support, like Java
  • Multi-threaded control
  • Object-Oriented
  • Declarative language rule-based knowledge
    representation/specification, like Prolog
  • Distributed communication/computation
    capabilities

6
Architecture of Web AgentsExtended BDI Model
Desire
Intention
Belief
effectors
sensors
7
Sensor/Effector Primitivesfor 3D Web Agents
getPosition(Object, X, Y, Z) setPosition(Object,
X, Y, Z) getRotation(Object, X, Y, Z,
R) setRotation(Object, X, Y, Z,
R) getViewpointPosition(Agent, X, Y,
Z) setViewpointPosition(Agent, X, Y,
Z) getViewpointOrientation(Agent, X, Y, Z,
R) setViewpointOrientation(Agent, X, Y, Z, R)
8
Distributed Logic ProgrammingDLP
Distributed logic programming Eliens1992
combines logic programming, object-oriented
programming and parallelism.
9
DLP has been extended with a 3D VRML Client
Interface Library, which includes the
sensor/effector primitives for 3D web agents.
10
Main Features of DLP for 3D Web Agents
  • Multi-threaded Language modeling of
    independent intra or inter agent activities
  • Distribution high-level TCP/IP based facilities
    for distributed communication, thus DLP can be
    used to build virtual multi-user communities
  • High-level communication Protocols support
    for Agent Communication Languages (ACL)
  • Declarative Language rule-based knowledge
    representation

11
Benchmark ExampleSoccer games on the Web
Http//wasp.cs.vu.nl/wasp/
12
Features of VRML-based Soccer Games
  • Multi-Agent Systems
  • Multi-User Systems
  • Reactivity
  • Cooperation / Competition
  • Dynamic Environments
  • Distributed Communication

13
(No Transcript)
14
Cognitive loopsensing-thinking-acting
thinking
acting
sensing
Belief
Intention
Desire
15
Cognitive model of soccer game
16
Action Specification in Agents Knowledge-Bases
  • look-at-ball
  • run-to-ball
  • shooting
  • passing
  • move-around
  • run-and-trace
  • near-ball-then-kick
  • ...

17
DLP code examplethe action Look-at-ball
look_at_ball(Player,Ball) - getPosition(Player,
X,_,Z), getPosition(Ball, X1,_,Z1), X \
X1, !, R is atan((Z-Z1)/(X-X1)) -
sign(X-X1)1.57, setRotation(Player,0.0,
1.0, 0.0, R).
18
DLP code examplethe action find-how-to-react
findHowtoReact(Agent, Ball, shooting)- getPosit
ion(Agent,X,Y,Z), getPosition(Ball,
Xb,Yb,Zb), gatePosition(Agent,Xg,Yg,Zg),
distance(X,Y,Z,Xb,Yb,Zb,Distb), distance(X,Y,Z,X
g,Yg,Zg,Distg), Distb lt kickableDistance Distg
lt kickableGoalDistance.
19
Agent Communication Language
  • agent communication languages (ACL) are used to
    serve as a high-level communication facility.
  • KQML and FIPA ACL which are based on speech act
    theory are popular agent communication languages.
  • A message in ACL usually consists of a
    communicative act, a sender name, a list of
    recipients, and additional content.
  • Communicative acts like 'tell', 'ask', and
    'reply', are used to identify the communication
    actions which may change the mental attitudes of
    the agents.

20
VRML-based client-server Architecture
server
VRML EAI
VRML EAI
VRML EAI
browser
browser
browser
client
client
client
21
Shared Object
  • A shared object is an object whose state and
    behavior are to be synchronized across multiple
    clients

22
3D agent-based virtual communities
  • Virtual environments with embedded agents
    autonomous agents are participants in virtual
    communities.
  • Virtual environments supported by ACL
    communication Agent communication
  • languages are designed to provide a high-level
    communication facility. The communication between
    the agents can be used for the realization of
    shared objects in virtual worlds.

23
PAMELA as Presentation AgentFacial Animation
24
H-anim 1.1 Compliant Avatars
The intelligent agent avatars are designed to be
H-anim 1.1 compliant, based on the specification
for a standard humanoid proposed by Humanoid
Animation Working Group.
25
DLP code exampleEyebrow Up and Lip Move
eyebrowUp_lipMove(Times,Interval, Range)
- getPosition(eyebrowRight, X1,Y1,Z1), getPosit
ion(eyebrowLeft, X2,Y2,Z2), eyebrow_up(eyebrowRig
ht, 0.01), eyebrow_up(eyebrowLeft,
0.01), lipMove(lowerlip,Times,Interval,Range), s
etPosition(eyebrowRight, X1,Y1,Z1), setPosition(e
yebrowLeft, X2,Y2,Z2).
26
Conclusions
  • A technology for 3D web agents needs a general
    programming / specification language which merges
    aspects of object-oriented languages, web3D-
    oriented languages, and declarative languages.
  • The distributed logic programming language DLP
    is a general programming/specification language
    for 3D web agents.
  • DLP is a convenient tool for the implementation
    of 3D web agents.
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