COGEVITO Complex Geometry Visualization Tool

Motivation Exploit the potential of Three,js for the visualization of complex geometries related to HEP detectors Online and offline data visualization Three,js is a JavaScript API for rendering interactive 2D and 3D graphics inside an HTML element. Since the web was invented at CERN, It is also a natural consequence to undertake new developments that will allow sharing of knowledge and information in a more intuitive and natural way which is obviously offered through graphics. It is now possible to envisage such developments and Three.js is probably a good candidate for this scope.

Short term (6 months) plan Feasibility study of the use of Three.js to Display any volume defined in root/Geant/GeantV Display any geometry (detector) defined in root/Geant/GeantV Use of materials defined in root/Geant/GeantV Display the geometry and manipulate (isolate, rotate, etc) interactively the various components Exploit the possibilities offered by the use of Three.js to display graphically any geometry and related data on the web Sharing information Integrating the functionality in the existing web page of the experiments (Normally are used static images to describe a detector).

Where we stand so far Acquiring knowledge of the functionalities offered by Three.js to display 3D volumes and other graphic objects on the web Creating a scene, volumes, materials, lighting etc Rendering the scene and interacting using rotation, zoom and other technics Exporting volumes defined in root/Geant/GeantV in JSON format Vertexes Normals Faces (triangles) Exporting volumes defined in root/Geant/GeantV in JSON format using Three.js primitives Importing JSON files in Three.js

DEMONSTRATION TOOL Geodemo: Display volumes defimed in GEOM, export to JSON format, import in Three.js

V2 V1 Some technical details Triangularization BOX: 6 faces, 8 vertexes, 12 segments AB C D ABC CDA Normal on face ABC V

Triangularization of complex volumes AB C D ABC CDA ->No of Vertices: >No of Segments: >No of Polygons:  No of Triangles: 25920

The long term plan By the end of August-2015 we will have exploited the potential of Three.js There exist already a tool that can display data (Root: 2D and 3D histograms) using Three.js () We will have a tool capable to display the full geometry of an/any experiment Starting from September-2015: We will describe the needed functionality of the tool in terms of user requirements We will provide a functional design according to the user requirements We will validate the design Start the development of the new tool