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INAF Astrophysical Observatory of Catania
VisIVO a VO-enabled tool for Scientific
Visualization and Data Analysis Kickoff
meeting Cambridge, November 18-19, 2004 Ugo
Becciani, A. Costa, M. Comparato, C. Gheller
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Cosmo.Lab
ASTRON NFRA Radio-data IRA Bologna Radio-data,
Dissemination, Education IFCTR Milano
Visualization of galaxies catalogs OACt
Cosmological simulations
CINECA Management and Technical coordination,
Assessment and requirement analysis,
Dissemination Funded by EU FP5
NATIONAL FUNDS Preliminary Study 2001 2002
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AstroMD
Object Oriented
AstroMD programming style
IncrTcl for GUIs C for computation
Platforms Linux RedHat, Debian Windows
2000/XP Source code
AstroMD languages
C for computation
IncrTcl for GUIs

• Object oriented
• Easy
• Interpreted

• Object oriented
• Efficient, fast, reliable
• VTK classes

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VTK C Library Classes

• VTK is an Open Source tool developed by Kitware
  inc. 3D computer graphics.
• VTK can be used with different languages
  (Tcl/Tk, Java, Python)
• Can be run on Linux (Unix) and Windows (PC and
  Mac OSX)
• Largely used to implement scientific tools

Technical Characteristics

• More than 700 C classes
• Extended set of 3D Widgets
• Surface Rendering and Volume Rendering
• Data interaction good efficiency
• Rendering windows easy use of lights, cameras
  and actor properties

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NEW TOOL VisIVO (or AstroMAF) (Visualization
data Interaction VO)
Programming Language C More Compatibility and
Integration with VTK classes Usage of MAF
Multimod Application Framework, funded by EU
FP5 (htpp//www.cineca.it/B3C/MAF/)
MAF main characteristics
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VisIVO basic components Readers
Specific readers will be implemented to support
astrophysical standard data formats
FITS Flexible Image Transport System (NASA,
http//fits.gsfc.nasa.gov) VOTables Standard for
the Virtual Observatory mandatory (XML
ASCII/BIN) HDF Hierarchical Data Format (NCSA,
http//hdf.ncsa.uiuc.edu) Only subset
supported. Tipsy common format for cosmological
simulation particle data (http//hermes.astro.wash
ington.edu/tools/TIPSY) Raw Particles Raw Grids
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VisIVO basic components Tools
Specific tools will be implemented to support
astrophysical data analysis and manipulation
Randomizer extract a random subset of points
Power Spectrum calculate the power spectrum of
a distribution of points Correlation Filter
calculate the correlation function in a point
distribution. Minkowsky Functionals evaluate the
geometry and the topology of a point
distribution Points Splatter distribute (using
Cloud in Cell algorithm) point-scalars on a
regular mesh Time evolution visualize time
sequences of a simulation
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VisIVO basic components Viewers
Specific views will be implemented to support
astrophysical data rendering
Point view visualize point-like data (color and
transparency can be changed) Isosurfaces and
volume rendering for visualization of grid-based
data 2D functions view for plotting functions,
histograms and all 2D analysis results Stereo
view for stereographics rendering HTML browser
for documentation/help pages
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Demo
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Demo