OpenSceneGraph

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OpenSceneGraph

• Jinseok Seo

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Outline

• What is OpenSceneGraph?
• Getting Started
• Examples
• Loading geometric models from files and
  positioning them in a scene
• Finding named nodes, updating DOF and switch
  nodes
• Using an update callback to articulate a node
  within a scene
• Using tracking devices
• Available Resources

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What is OpenSceneGraph?

• A C API built on OpenGL for
• Scene Management
• Graphics Rendering Optimization
• Cross-platform
• Windowing system agnostic
• Open Source

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What is OpenSceneGraph?

• Functional Components

OSGUtil Traversers Enhancements
OSG Scene Graph Rendering Elements
OSGDB Data Base Loading Plug-in Management
Plug-Ins
OSGText
OSGSim
Node Kits
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What is OpenSceneGraph?

• File Formats Supported
• File Formats
• 3dc, 3ds, ac3, dw, flt, Freetype
• Iv, ive, logo, lwo, md2, obj
• osg, osgtgz, tgz, txp, directX, zip
• Image Formats
• Bmp, dds, pic, png
• pnm, qt, rgb, tga

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What is OpenSceneGraph?

• Who is Using OSG?
• Magic Earth - Geoprobe - Oil Gas
• Boeing - Flight simulation
• Indra - Train simulation
• STN Atlas - Simulation
• NASA - Earth visualization
• Norcontrol - Maritime simulation
• Real World Entertainment - Gaming (Releasing Java
  Bindings)
• Terrex - LOD Paging
• POSTECH -

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Getting Started

• Downloading and Building Source Code
• http//www.openscenegraph.org
• 3rdParty_Win32binaries_2004-07-25a.zip
• OpenSceneGraph-Data.zip
• Optional (OpenGL Performer, GDAL, )
• OSG_OP_OT-0.9.8-2.zip

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Getting Started

• Downloading and Installing Binaries
• Debian, MinGW, Mac OSX, IRIX, Suse 9.1, Fedora
  core 3
• Win32 binaries
• http//mew.cx/osg
• Includes OpenSceneGraph-Data, 3rdParty
  dependencies, and osgVRPN

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Getting Started

• Compiling with MS Visual Studio
• Visual Studio .NET
• Works well
• Visual Studio 6.0
• Install STLport-4.5
• http//www.stlport.org/download.html
• Uncomment the sentence at about line 45 in the
  file stlport/stl_user_config.h
• define _STL_NO_OWN_IOSTREAM 1
• Setting up include path and library path

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Getting Started

• Running Examples
• Setting up the path to the applications and DLLs
  (PATH)
• where/you/put/OpenSceneGraph/bin
• Setting the OpenSceneGraph Data file path
  (OSG_FILE_PATH)
• Where/you/put/OpenSceneGraph-Data
• osgviewer cow.osg

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Examples

• Jason McVeigh's OpenSceneGraph Tutorial Set.
• http//openscenegraph.org/documentation/NPSTutoria
  ls/

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Example 1

• Loading geometric models from files and
  positioning them in a scene

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Example 1
root (osgGroup)
tankXform (osgPositionAttitudeTransform)
tankNode (osgNode)
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Example 2

• Finding named nodes, updating DOF and switch nodes

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Example 2
root (osgGroup)
tankOneGroup (osgGroup)
tankThreePAT (osgPositionAttitudeTransform)
tankTwoPAT (osgPositionAttitudeTransform)
tankThreeGroup (osgGroup)
tankTwoGroup (osgGroup)
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Example 3

• Using an update callback to articulate a node
  within a scene

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Example 4

• Manually positioning a camera
• Create and initialize a matrix with the correct
  world position and orientation.
• Get the inverse of this matrix and
• Provide a world up orientation. In this case by
  rotating from Y up to Z up.

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Example 5

• Using tracking devices

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Available Resources

• www.openscenegraph.org
• OpenSceneGraphReferenceDocs.zip
• Tutorials
• Examples
• Source Code
• Mailing List Archives
• jsseo_at_postech.ac.kr

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Thank you!