1. Open-DIS
Open Source Distributed Interactive Simulation Protocol in C++ and Java
Don McGregor (mcgredo <at> nps.edu)

2. Distributed Interactive Simulation
What is it?
• Well-known military modeling & simulation protocol, standardized in IEEE-1278 family of standards
• Used in real time military simulations
• Can interoperate with High Level Architecture (HLA) via gateways
• Actively being developed via the SISO DIS PDG; 200x standard is upcoming

3. Open Source Standards
DIS is a classic candidate for an open source implementation
• Standardized in 1995, relatively slow moving target
• Many client applications
• Extremely long product cycles in DoD means licenses become a major issue as companies move on
• Why is the government paying for this code over and over again? In either buying a commercial implementation or paying contractors to write it for their own applications, the government has been paying people to write the same code for decades

4. Open Source DIS Strategy
Do it, do it right, and give it away
The free version should be higher quality than self-written implementations
Create an open source reference implementation and stop re-inventing the wheel. Make it easier, better, and simpler to just download the code rather than to write or buy a version
This requires a simple open source license that does not contaminate proprietary vendor code
Works well with long product life cycles
Aligns with DoD Modeling and Simulation Strategic Vision

5. Open-DIS Two implementations right now, trying to converge to one:
• DIS-XML: can read and write to XML, Java only
• Open-DIS: Java and C++ source, but does not yet read & write XML. This should be fixed shortly.
Open-DIS is the first open source C++ implementation

6. XML Advantages • Preferred format for archiving
• Access to the full range of XML tools, including databases (XML and relational), transformation, web services, etc
• Can ship XML-ified DIS across XMPP
• DIS data is no longer an island--it’s just more XML data

7. Getting the Code
Source code is available for download at
License is BSD. Non-viral, intended to be as friendly as possible to commercial adoption
We do not want to hear the excuse “but this will make us open source our proprietary code”--it won’t.

8. Delta 3D
The C++ work was done in cooperation with NPS’s open source game engine, Delta3D--the objective is to have the game engine able to work with DIS and military sims, plugged in with SimKit discrete event simulation

9. Future Work Lots of potential future work here:
• DIS-HLA gateway, using the Portico open source HLA implementation to bridge to the other major DoD M&S networking standard
• Supporting tools: Loggers, data analysis, etc.
• DIS Enumerations
• In general: create reference open source implementations of DoD M&S standards
• Hook up DoD protocols to commercial MMOG frameworks