[Paraview] Normals consistency on a Multi-block dataset of surfaces

[Richard GRENON]

Hello all.

Could someone tell me if there is a simple way to get Normals 
consistency over a multi-block dataset that contains only structured 
surfaces grids?

Here is my problem: I have a multi-zone Tecplot file that contains the 
skin of the right part of an aircraft, so the skin is NOT closed in the 
symmetry plane. The skin is a collection of structured IxJ ordered 
surface grids. The orientation of the surface grids are not consistent, 
some grids having normals pointing outward, other grids having normals 
pointing inward, and I need all normals pointing the same direction for 
Surface Flow integration.

The Tecplot reader gives a multi-block dataset and I am using these 
filters for rendering:

Tecplot reader->Extract Surface->Generate Surface Normals

The Generate Surface Normals filter is used with Consistency property on 
(the default).

Also rendering with light is OK, adding the NormalGlyph filter shows 
that normals are still inconsistent, each surface grid keeping its 
orientation, and using the Surface Flow filter with any vector gives bad 
results.

Thank you in advance for any suggestion.

Best regards.

-- 
 Richard GRENON
 ONERA
 Departement d'Aerodynamique Appliquee - DAAP/ACI
 8 rue des Vertugadins
 92190 MEUDON - FRANCE
 phone : +33 1 46 73 42 17
 fax   : +33 1 46 73 41 46
 mailto:Richard.Grenon at onera.fr
 http://www.onera.fr