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Given by Wojtek Furmanski and Balaji Natarajan, Hasan/Zeynep Ozdemir, Tom Pulikal at UC Web Applications Certificate on July 24 1997. Foils prepared 5 August 97
Outside Index
Summary of Material
| This describes developments in multi-user VRML |
| JSDA and NPAC TVR EXperiment |
| Living worlds VRML Working Group |
| Open Community and Java API for Multi-User Worlds |
| Relation to JSDA and DoD Simulation Systems |
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VRML'97 Scripting and the Latest Developments
PPT Slide
PPT Slide
VRML'97 Scripting - Overview
VRML'97 Scripting Techniques
VRML'97 - Latest Developments
Latest Developments towards Multi-user VRML Standards
Why multi-user VRML standards
Multi-user VRML - Base Concepts
Multi-user VRML - Base Concepts
PPT Slide
PPT Slide
PPT Slide
Multi-user Standard Activities
Living Worlds: Goals, Approach
Living Worlds Working Group
Living Worlds - Terms & Concepts
Living Worlds Terms & Concepts 2
PPT Slide
PPT Slide
Living Worlds - List of Nodes
Open Community - Java API for Multi-user Scripting and Networking
Open Community -The Model
PPT Slide
Open Community - Implementation
Open Community Implementation 2
PPT Slide
PPT Slide
Putting it all together using JSDA
PPT Slide
Outside Index
Summary of Material
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| Balaji Natarajan |
| Hasan Timucin Ozdemir |
| Zeynep Odcikin Ozdemir |
| Tom Pulikal |
| Wojtek Furmanski |
HTML version of Basic Foils prepared 5 August 97 
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HTML version of Basic Foils prepared 5 August 97
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HTML version of Basic Foils prepared 5 August 97
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| VRML 1.0 was a declarative (scene description) language |
| VRML 2.0 /97 adds dynamic procedural elements via scripting techniques (to support animation and event handling) |
| Eventually, we want to build multi-user interactive world-wide distributed worlds - is VRML'97 sufficient for it? |
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In this lecture, we scripting discuss various scripting techniques such as:
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| We will illustrate VRML'97 scripting using a set of examples, including NPAC demos such as Visible Human or TVR Prototype |
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| The most interesting and advanced use of VRML scripting is for building multi-user networked virtual worlds (televirtual environments) |
We will summarize current efforts towards multi-user VRML standards such as:
|
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| No multi-user standard activities some 1/2 year ago - consensus that too early as not enough applications |
| Early multi-user prototypes in `97 (including ours) afterVRML2.0 was published |
| Several multi-user standard activites were started soon afterwards |
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| VRML'97 Scripting, when linked with Java, allows for fully interactive multi-user 3D programming |
| However, everything is custom, including avatars in these new brave worlds |
| That's not acceptable by the emergent `avatar industry' |
| Avatar companies are current main pushers for multi-user VRML standards |
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| Base concepts are as in our early TVR demo |
| Active VRML objects (avatars) are mapped on user controls (e.g. mouse) and linked with JavaVM via Java nodes |
| Java sector maintains connections with collaboratory servers |
| User/avatar actions are passed from VRML to Java to network to Java to VRML to users |
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| Base concepts are as in our early TVR demo |
| Active VRML objects (avatars) are mapped on user controls (e.g. mouse) and linked with JavaVM via Java nodes |
| Java sector maintains connections with collaboratory servers |
| User/avatar actions are passed from VRML to Java to network to Java to VRML to users |
HTML version of Basic Foils prepared 5 August 97
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HTML version of Basic Foils prepared 5 August 97
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HTML version of Basic Foils prepared 5 August 97
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HTML version of Basic Foils prepared 5 August 97
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| Living Worlds - standardize VRML support for multi-user applications |
| Open Community - standardize Java node support for multi-user VRML applications |
| Universal Avatars - standardize high level behavior, social rules, language |
| JSDA - standardize synchronous real-time multimedia collaboratory services |
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| Define a set of VRML'97 conventions to support interpersonal (multi-user) and interoperable (multi-vendor) applications |
| Extract standard components from existing and working (proprietary) applications |
| Time-To-Market a critical factor in design decisions: early draft Feb'97, Draft 1.0 by mid `97 |
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Mitra from Mitra Internet Consulting
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| Yasuaki Honda from Sony Corporation |
| Bob Rockwell from Black Sun Interactive |
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| MUTech (Multi-User Technology) - encapsulates vendor specific networking support for shared objects and spaces |
| Zones - act as shared regions that group objects aware of each other |
| Shared Objects - Zone children, instantiated on all interested clients |
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| Pilots and Drones - active (unique) and passive instances |
| Avatars - Human driven Pilots |
| Capabilities - interactive `devices' for convenient communication (whiteboard, phone, VTC camera etc.) |
| Security Support - to avoid malignant hackers |
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HTML version of Basic Foils prepared 5 August 97
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| Sharability: Zone, PrivateZone, SharedObject, PrivateSharedObjects |
| MUTech Nodes: MUTechZone, MUTechSharedObjects |
| Utilities and Workarounds: AssociativeStringArray, Message, MessageHandler, CooperativeLock, SmoothMover, Behavior, etc. |
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| Based on SPLINE (Scalable Platform for Large Interactive Network Environments) by Mistubishi Electric Research Lab (MERL) |
Authors:
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| Central Construct - World Model, i.e. object-oriented dynamic database (datafoam) |
| Applications/clients interact with the World Model and induce changes to the World |
| Backend is handled by proprietary collaboratory engines/servers |
| Frontend is now published in the form of extensive Java and C APIs |
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| World Model is (conceptually) replicated in all clients |
| In practice, that's not realistic for large worlds as non-scalable |
| Worlds are chunked into regions of mutual interest and only regions are (dynamically) replicated (not analogy with LW Zones) |
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| All state changes of shared objects are dynamically broadcast to (conceptually) all other objects |
| In practice, that's again not realistic for real-time simulations (as learned by DIS) |
| The multicast is restricted to those who expressed interest (similar to event filtering in HLA/RTI in DoD M&S or javaBeans) |
HTML version of Basic Foils prepared 5 August 97
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HTML version of Basic Foils prepared 5 August 97
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HTML version of Basic Foils prepared 5 August 97
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| Living Worlds standardize VRML support for multiuser applications |
| Open Community standardizes the associated Java node support |
| JSDA is a promising candidate for collaboratory servers (tested in TVR demo) |
| Uses small number of generic primities: Clients, Session, Channels, Tokens which match well with Living Worlds nad Open Community |
HTML version of Basic Foils prepared 5 August 97
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