[Paraview] How to display normals, INPUT from a VTK file in Paraview ?

[Magician]

Hi Vincent,


Try Cell Centers filter.
Maybe normals are mapped to points (generated at cell centers).
Next applying Glyph filter and you may get expected results.


Magician


On Jan 15, 2014, at 2:00, paraview-request at paraview.org wrote:

> Message: 1
> Date: Tue, 14 Jan 2014 16:14:53 +0100
> From: Vincent Leroy <vincent.leroy at innosea.fr>
> To: paraview at paraview.org
> Subject: [Paraview] How to display normals, INPUT from a VTK file in
> 	Paraview ?
> Message-ID: <2b1afa04c2e02ba0e58a24fd83c2f702 at innosea.fr>
> Content-Type: text/plain; charset="utf-8"
> 
> 
> 
> Hi, 
> 
> I am a new user of Paraview. I am facing a problem I cannot solve and I
> have not found any relevant practice on the internet (guide user,
> mailing, ...)... I want to visualise my mesh with normals specified IN
> MY VTK FILE (and NOT the Normals Glyphs calculated by the software) (I
> have these normals calculations in another code and I do not want to
> change that). 
> 
> I am importing a mesh in Paraview from a VTK file. The VTK file contains
> the following elements: 
> 
> # vtk DataFile Version 2.0
> hydrodynamic vtk mesh for paraview vizu
> ASCII
> DATASET POLYDATA
> POINTS 458 float
> x0 y0 z0 (points coordinates) 
> 
> ... ... ... 
> 
> ....... 
> 
> POLYGONS 465 2325 
> 
> 4 n1 n2 n3 n4 (points IDs) 
> 
> 4 ... ... ... ... 
> 
> ...... 
> 
> CELL_DATA 465 
> 
> NORMALS cell_normals float 
> 
> ... ... ... (normals coordinates) 
> 
> A 'cell_normals' array appears in 'Information'; I am able to color the
> surface (each cell) of the mesh according to the values of the
> cell_normals array (Magnitude, X, Y or Z) but nothing more. This gives
> me information on the normals orientation but I have no visual on the
> vectors. 
> 
> How is it possible de visualise these normals (displayed as vectors) on
> Paraview without calculating them with the software? What is the correct
> pratice ? I need to know if they are well oriented, I also need some
> visual on the mesh I am studying. 
> 
> Thanks a lot, 
> 
> Best regards. 
> 
> -- 
> 
> Vincent