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==Introduction==

This document presents a distributed interactive audiovisual
virtual reality system. In addition to visual
rendering tool, the system contains a complete package
of tools for producing interactive virtual audio
environments from dynamic 3D geometries. Aim
of the system presented in this document is to produce realistic
audio-visual environments in real-time, where dynamic
changes in the scene are possible. This is
achieved with multiple applications sharing the same
3D information and a chain of novel sound rendering
tools. All components seen in the figure 1 are briefly explained in this document. More information about each of the components can be found in other pages of this wiki.

[[Image:System_overview.png|thumb|640px|Figure 1. General overview of the Uni-Verse audio system]]

==Uni-Verse tools for graphics==

The backbone in the sharing of 3D data is Verse,
as emphasized in figure 1. The changes made by any application are
seen by all the other applications. Dynamic changes in the
3D geometry are immediately heard in the auralized
sound when acoustic simulation and sound renderer
are used.
A visual rendering engine such as [http://www.quelsolaar.com/quel_solaar/index.html Quel Solaar] or [http://wiki.blender.org/index.php/OpenSG_Renderer OSG renderer]
allows the users to see the modifications made by
the content creation tools. It can be thought of as
a window to the virtual world that Verse server is
hosting. Changes in textures, modifications in the
geometry, and added objects can be seen by anyone
using this tool. Also using an other computer for
visual rendering can ease the task for the computer
running the content creation tool.
Different applications can be used to move the listener,
but visual rendering engine is obvious choice
because graphics is seen and sound is heard from
the first person viewpoint. The visual renderer can
update the listener orientation and coordinates to
Verse with high refresh rates allowing the visual and
aural feedback to be continuous.

Content creation tools can be used to modify the
3D geometry. Plugins in 3D modeling
software [http://www.blender.org/ Blender] or [http://usa.autodesk.com/adsk/servlet/index?id=5659302&siteID=123112 Autodesk 3ds Max]
allow multiple users to collaborate by building and
modifying the same geometry stored in Verse server.
This geometry is shared with an acoustic simulation
tool that immediately reacts to the changes in the
geometry. In addition, creating and moving multiple
sound sources is possible through these applications.
When the sound source is placed in the geometry,
an URL of the sound file or stream is defined. The
URL is attached to the sound source information
and forwarded through Verse to other applications.
Content creation tools can also be used to define the
positions of the sound sources and to move them
inside the model. More information about the plugin for 3ds Max is available [http://wiki.blender.org/index.php/Uni-Verse:Verse4Max here] and for Blender [http://wiki.blender.org/index.php/BlenderDev/VerseIntegrationToBlenderUserDoc here]

==[[Extensions:Uni-Verse/Acoustic Geometry Reduction|Geometry reduction]]==

The geometrical data used by the graphics tools is
usually too complex to be used directly in the acoustic
simulation. Thus a geometry reduction module,
utilizing a novel simplification technique, is attached
to the system. It reads the data from the Verse
server, reduces its geometrical complexity, and forwards
it to the acoustic simulation module. The
process is performed at interactive rates, which allows
the use of dynamic geometries.

==Acoustic simulation==
The role of the room acoustic simulation module (UVAS) is to
find out how the sound emitted from sound sources
is propagated through the model to the listener. The
module gets the geometry data of the model from a
Verse server and is using the beam-tracing method
to find the relevant early reflections of the active
sound sources. The result is a set of reflection
trees describing the reflections and their relations,
consisting of one tree for each active sound source.
The result is sent to the sound renderer which is
responsible for computing the audible result.

==[[Extensions:Uni-Verse/Uni-Verse_Sound_Renderer|Sound renderer]]==

The sound renderer is connected
to the room acoustic simulation module UVAS and it
receives commands for updating the aural response.
The instructions how to render the audio environment is sent through Uni-Verse Sound Rendering Protocol (UVSRP). The Sound renderer is the back end for a chain of acoustic simulation modules and reproduces the sound for the listener using loudspeakers or headphones. It auralizes the direct sound and early reflection
paths calculated by UVAS and adds artificial reverberation.
The data transmitted to the sound renderer
is stored in reflection trees that consist of listener,
source, and image source information including, e.g.,
position, orientation, visibility, URL of the sound
file, and child-parent relationship.

[[Category:Audio]]
[[Category:Overviews]]

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