Space Partitioning and Scene Graphs

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Open<strong>Scene</strong>Graph library Layer above OpenGL www.openscenegraph.org Heavy use of OO, templates, design patterns● C++, plus bindings in Java, Python, etc. Still developing, but growing popularity ingraphics community Supports: view frustum cull, occlusion cull,detail cull, LoD, much more Alternatives: OpenSG (parallelized),VTK (visualization, 2D/3D image processing),OpenInventor (old), OpenRM, Fahrenheit (old)CMPT370: spatial data structures 2 Apr 200912
The OSG distribution Core OSG: main libraries, node types NodeKits: additional node classes Plugins: for reading/writing various file types● 3D geometry: 3DS, AC3D, Alias LightWave,OpenFlight, TerraPage, VRML, etc.● Images: jpg, gif, png, tiff, etc. Interoperability libraries: for interfacing with otherlibraries, languages ExamplesCMPT370: spatial data structures 2 Apr 200913
Page 1 and 2: Data Structures for Modelling2 Apri
Page 3 and 4: Why use spatial data structs? Geome
Page 5 and 6: Octrees In 1D: binary tree In 2D: q
Page 7 and 8: Building balanced trees Use the obj
Page 9 and 10: Bounding volume hierarchies Straigh
Page 11: Controlling detail Consider project
Page 15 and 16: OSG::Group Generic node thatmay con
Page 17 and 18: OSG::Geode Contains the actual geom
Page 19: OSGEdit Import models from other pr

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