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MUVE Platform – OpenSim

30/04/2011
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Definition of some common terms (from the OpenSim Web Site):

Region
A region has an (x/y) position in a grid, and a region-handle calculated from the position. A region can also be defined as an IP Endpoint that the Viewer can establish a client connection to. The unique id of a region is a uuid, this means that a region can change position, and because of that position change, it the handle will be recalculated. The handle will uniquely identify a position in a grid.

A region contains a number of sub components:

  • Scene
  • Client/Viewer circuits

Scene
A scene is part of a region, currently there is a one to one relationship, i.e. one region has one scene. A scene contains all the 3d objects, called Entities, entities can either be ScenePresences or SceneObjectGroups. A ScenePresence can be represented by an avatar, if it is a root scene presence. SceneObjectGroups consists of a number of SceneObjectParts.

Avatar/ScenePresence
Each viewer is represented by one or more avatars. The Root avatar or ScenePresense functions as a kind of cursor, into the grid. Where the region will keep the viewer updated on the state of the simulation, taking place in the scene. Besides the root presence, a number of child presences will exist in the neighboring regions, enabling the viewer to know what is going on in the neighboring regions.

Viewer
An application which is used to view the state of the simulation. Currently only three different viewers are known: the LL viewer, the OpenSL test client and AjaxLife.

Session
Each connection between a viewer and a region, regardless if the avatar is the root or a child, is a session.

Simulator
A program which can manage several Regions

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