[Paraview] RE data array multi-component labelling

Fri Jun 4 06:33:25 EDT 2010

Hi Jean,

In the current paraview master, you can name each components of and array. 
You have a new method vtkAbstractArray::SetComponentName() for this.
If set, those component names appear in place of the traditionnal X, Y et 
and Z suffixes.
So you may have to modify your reader to use this new interface.

As for the possibility to create an isosurface using a given component, it 
is planned for this summer, by implementing the notion of "pre-filters" 
which will adapt the input of a filter to fit the filter requirement.
More exactly what is planned for now is to automatically extract a given 
component for scalar-based filters, and project cell to point for the 
isosurface (with a warning that some interpolation is used).

Best,
Stephane

Stephane PLOIX
Pilote Opérationnel - Visualisation scientifique
EDF - R&D
SINETICS
1, Av du Général de Gaulle
92140 Clamart

stephane.ploix at edf.fr
Tél. : +33 (0) 1 47 65 51 10

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jfavre at cscs.ch 
Envoyé par : paraview-bounces at paraview.org
04/06/2010 11:19

A
paraview at paraview.org
cc

Objet
[Paraview] data array multi-component labelling

I am creating grids with node-based data about ionization states. So, for 
different elements from the Periodic Table of Elements, I may have several 
states. For example:

Hydrogen has two 2 states, Helium has 3, Iron has 15. 

The data are stored as vtkDoubleArrays with tuples of numbers. The Number 
of Components is equal to the number of ionization states.

My problem is in the GUI.

Any array with number of components less or equal to 3 can be colored by 
Magnitude, or by component, where the components are labelled X, Y, Z. 
However, in this chemistry problem, the components are not spatial 
dimensions, they have nothing to do with XYZ.
Any array with number of components greater than 3, can be colored by 
component labelled from 0 to N-1, which the correct way we think of when 
calling elements and their ionization states.

Is there a way to enforce this labelling from 0 to N-1, instead of the 
spatial-centric notation _X, _Y,_Z?

The problem shows up elsewhere. Using the Calculator, I get a long list of 
labels, some of them indexed by _[XYZ], some of them indexed by 
_{012345678910]. We would much prefer an homogeneous labelling.

A much improved GUI for the Contour module would be the ability to 
directly choose a component from a multi-component data array, without 
having to resort to the Calculator. is this in the plan?

Thanks for the help
-----------------
Jean M. Favrech
Swiss National Supercomputing Center

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