01.03.2013 Views

DOCTORAATSPROEFSCHRIFT - EDM - UHasselt

DOCTORAATSPROEFSCHRIFT - EDM - UHasselt

DOCTORAATSPROEFSCHRIFT - EDM - UHasselt

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

2.1 NVE systems 29<br />

Figure 2.2: Maniac Mansion (1988). The interface is partially graphical and<br />

partially text-based, point-and-click.<br />

Software Engineering (CASE), concurrent engineering, workflow management,<br />

distance learning, telemedicine, . . . .<br />

Also in that period, the US military started to interconnect several of its<br />

single-user VR simulations in order to allow training with human allies and<br />

opponents. The SIMNET [Miller 95] project resulted in a standard that is<br />

still being used today, DIS (Distributed Interactive Simulation). A few years<br />

later, non-military NVEs started to appear. Some of the most important include:<br />

NPSNET [Macedonia 95], DIVE (Distributed Interactive Virtual Environment<br />

[Hagsand 96]) and MASSIVE (Model, Architecture and System for<br />

Spatial Interaction in Virtual Environments [Greenhalgh 95]). NPSNET, was<br />

one of the first systems that although it was based on the DIS system, was<br />

designed for the Internet, using IP multicast to inform clients of updates. Furthermore,<br />

it was one of the first systems that deployed Area Of Interest (AOI)<br />

management, in order to decrease the number of updates that needed to be<br />

sent. DIVE on the other hand, aimed at dedicated networks by employing<br />

full broadcast for all updates that needed to be sent, and all clients held a full<br />

state of the entire virtual world. It differs from similar approaches in its dynamic<br />

and flexible capabilities and its focus on interaction and human-human

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!