Develop a working osgART application

What is a Scene Graph?

Tree-like structure for organising a virtual world, e.g. VRML
Hierarchy of nodes that define: Groups (and Switches, Sequences etc…) Transformations, Projections, Geometry …

And states and attributes that define:

•  Materials and textures
•  Lighting and blending

Benefits for performance

•   Structuring data facilitates 
• optimization:- Culling, state management, etc

What is a Open Scene Graph (OSG)?

Open-source scene graph implementation

Based on OpenGL

Object-oriented C++ following design pattern principles

Used for simulation, games, research, and industrial projects

Maintained by Robert Osfield | Documentation project: www.osgbooks.com

Uses the OSG Public License (similar to LGPL)

What is a osgART?

OSG + ARTookit = osgART

osgART adds AR to Open Scene Graph

Current version 2.0, Open Source

To add Video see-through AR:

•  Integrate live video
•  Apply correct projection matrix
•  Update tracked transformations in real-time

Develop a working osgART application from scratch?

Use ARToolKit 2.72 

     library for tracking and 

     video capture

Install OSG

Tutorial 1 : Basic OSG Viewer | OSG 

Install osg (.exe) to your computer

Run basic viewer - located in osg folder in C:\\Program Files (Windows)

Tutorial 2: Adding Video | OSG + ARToolkit

Add a video plugin

Load, configure, start video capture…

Add a video background

Create, link to video, add to scene-graph

Tutorial 3: Tracking | OSG + ARToolkit

Add a Tracker plugin

 Load, configure, link to video

 Add a Marker to track

 Load, activate

 Tracked node

 Create, link with marker via tracking callbacks

 Print out the tracking data

Tutorial 4: Adding Content | OSG + ARToolkit

Now put the tracking data to use!

Add content to the tracked transform 

Basic cube code

e.g. Wavefront (.obj), OpenFlight (.flt), 3D Studio (.3ds), COLLADA

Replace the simple cube with a 3D model

Models are loaded using the osgDB::readNodeFile() function

OSGART sample project by other researchers