Don Brutzman and Mike Zyda NPSNET Research Group

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Dial-a-Behavior Protocol (DBP) for Networked Virtual Environments and DIS-Java-VRML Library Don Brutzman and Mike Zyda NPSNET Research Group Naval Postgraduate School May 6, 2019

Dial-a-Behavior Protocol (DBP) summary Dial-a-behavior protocol supports DIS-like data protocol design and development Support large-scale multicast applications such as virtual environments and net games Modifiable on-the-fly across network, for rapid wide-area experimentation and testing Public-domain software: Virtual Reality Modeling Language (VRML) and Java 12 February 98 Dial-a-Behavior Protocol (DBP)

Dial-a-Behavior Protocol (DBP) briefing topics project objectives background and motivation DoD and public-domain relevance completed work target architecture timetable 12 February 98 Dial-a-Behavior Protocol (DBP)

Dial-a-Behavior Protocol (DBP) project objectives DIS entity state protocols hard to modify due to fixed formats, slow standards process Entity interaction protocols are a crucial network capability that need better testing Formal grammars & agent software provide a rapid modify/test/revise methodology produce “dial-a-behavior protocol” (DBP) to support large-scale virtual environments 12 February 98 Dial-a-Behavior Protocol (DBP)

Dial-a-Behavior Protocol (DBP) background Zyda postulated initial concept Macedonia dissertation identified need two supporting masters theses complete, initial work performed without funding ONR funding: 1.5 years programmer time Brutzman & McGregor: DIS-Java-VRML software library is basis for design and implementation of dial-a-behavior protocol 12 February 98 Dial-a-Behavior Protocol (DBP)

background: DoD relevance increasing numbers and size of simulations need to get past ~500 entities value of approach is recognized by DIS community but not yet implemented pertains to all (DoD, public domain) physically based real-time simulations component of virtual reality transfer protocol (vrtp), usable by any VRML 3D 12 February 98 Dial-a-Behavior Protocol (DBP)

Dial-a-Behavior Protocol (DBP) completed work Michael Canterbury thesis BNF PDU specification grammar, lex parser Steve Stone thesis PDU specification editor, Motif interface Jack Kapp class project written in perl HTML combo-form PDU specification editor http://www.stl.nps.navy.mil/~kapp/disPSU.cgi Don Brutzman: architecture design 12 February 98 Dial-a-Behavior Protocol (DBP)

Dial-a-Behavior Protocol (DBP) Canterbury thesis September 1995 devised formal grammar in Backus-Naur form (BNF) implemented DIS grammar specification demonstrated parser written in lex 12 February 98 Dial-a-Behavior Protocol (DBP)

Dial-a-Behavior Protocol (DBP) Stone thesis June 1996 revised grammar specification developed a Motif user interface for the protocol grammar editor initial evaluation of improvements in network performance online paper published in 14th DIS workshop March 1996 12 February 98 Dial-a-Behavior Protocol (DBP)

target architecture design no proprietary software completely Web accessible key concept: we are programming the Internet as if it were a single computer on-the-fly syntax and semantics changes to over-the-wire data formats enables protocol customization to match distributed application needs 12 February 98 Dial-a-Behavior Protocol (DBP)

general entity solution VRML Java rendering computation data sharing network 12 February 98 Dial-a-Behavior Protocol (DBP)

protocol-redefinition architecture protocol guru Protocol Definition Interface Grammar parser builds replacement protocol manager AOIM - Area of Interest Managers Multiplayer networked Application Data Units Shared 3D VRML Worlds 12 February 98 Dial-a-Behavior Protocol (DBP)

Dial-a-Behavior Protocol (DBP) timetable 1 1996 finished protocol design, 25% implemented 1997 Completing baseline DIS software library DIS PDUs & VRML testing on global MBone DIS-Java-VRML (DJV) working group meeting November 12, Mountain View CA DJV recommended practices for VRML 12 February 98 Dial-a-Behavior Protocol (DBP)

Dial-a-Behavior Protocol (DBP) timetable 2 1998 Adapt DIS-Java-VRML (DJV) software library to dial-a-behavior protocol (DBP) Extend wide-scale testing, working group scope Build example optimized protocols DIS “light” and multiplayer networked game VRML Human Animation working group Working group meeting and tutorial VRML 98 Global demonstration SIGGRAPH August 98 12 February 98 Dial-a-Behavior Protocol (DBP)

Dial-a-Behavior Protocol (DBP) contact info Don Brutzman brutzman@nps.navy.mil 408.656.2149 voice, 408.656.3679 fax Mike Zyda zyda@siggraph.org 408.656.2305 voice, 408.656.4083 fax http://www-npsnet.cs.nps.navy.mil/npsnet/ 12 February 98 Dial-a-Behavior Protocol (DBP)