Sep 2 – 9, 2007
Victoria, Canada
Europe/Zurich timezone
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Next generation of OpenGL support in ROOT

Sep 4, 2007, 11:35 AM
Lecture (Victoria, Canada)


Victoria, Canada

oral presentation Software components, tools and databases Software components, tools and databases


Dr Matevz Tadel (CERN)


OpenGL has been promoted to become the main 3D rendering engine of ROOT. This required a major re- modularization of OpenGL support on all levels, from basic window-system specific interface to medium-level object-representation and top-level scene management. This new architecture allows seamless integration of external scene-graph libraries into the ROOT OpenGL viewer as well as inclusion of ROOT 3D scenes into external GUI and OpenGL-based 3D-rendering frameworks. Scene representation was removed from inside of the viewer, allowing scene-data to be shared among several viewers and providing for natural implementation of multi-view canvas layouts. The object-graph traversal infrastructure allows free mixing of 3D and 2D-pad graphics and makes implementation of ROOT canvas in pure OpenGL possible. Scene-elements representing ROOT objects trigger automatic instantiation of user-provided rendering-objects based on the dictionary information and class-naming convention. Additionally, a finer, per- object control over scene-updates is available to the user, allowing overhead-free maintenance of dynamic 3D scenes and creation of complex real-time animations. User-input handling was modularized as well, making it easy to support application-specific scene navigation, selection handling and tool management.
Submitted on behalf of Collaboration (ex, BaBar, ATLAS) ALICE and ROOT project

Primary author

Dr Matevz Tadel (CERN)

Presentation materials