[Paraview] Problem with Transform filter

[Adriano Gagliardi]

Paul,
 
I've just checked that out and, by applying the filter twice after each
vector creation it works now. That has completely caught me out. I assumed
(not a good thing clearly) that the filter would transform the entire
data-set, but at least it explains why only a single vector was getting
converted to a float.
 
Thanks again for pointing this out.
 
Regards,
 
Adriano
 

===================================

Adriano Gagliardi MEng PhD
Business Sector Leader
Computational Aerodynamics
Aircraft Research Association Ltd.
Manton Lane
Bedford

Tel: 01234 32 4644
E-mail: agagliardi at ara.co.uk
Url: www.ara.co.uk


  _____  

From: Paul Edwards [mailto:paul.m.edwards at gmail.com] 
Sent: 26 November 2010 08:39
To: agagliardi at ara.co.uk
Cc: paraview at paraview.org
Subject: Re: [Paraview] Problem with Transform filter



When you use the transform filter it will also transform the "active"
vectors, i.e. rotating the model will rotate the vectors too.  Note: this is
very confusing if you have multiple vectors as it is not immediately obvious
which one is getting transformed (as only one is "active"). 
Regards,
Paul


On 25 Nov 2010 10:44, "Adriano Gagliardi" <agagliardi at ara.co.uk> wrote:


Dear All,

I've come across some strange behaviour using the transform filter. I have
two pipelines that are near identical. Infact, the only difference is the
point at which a transform about a single axis is applied. The process is as
follows:

1 Read Data
2 Extract Blocks
3 Extract Surface
4 Generate Surface Normals
5 Calculator (create vector, var*Normals)
6 Calculator (create vector from scalars)
7 Integrate data

If I apply the transform at any point before step 6, I get one set of
integrated values. If I apply it after step 6, then my x components of the
first vector & z component of the second vector are completely different
(even different signs), but the others still agree well. I noticed that the
transform filter was actually converting the value computed in item 6 from a
double to a float, so I changed this last night and recompiled. I also
changed the vtkPolyDataNormals to use doubles instead of floats. However,
neither of these changes has helped the issue.

I fail to see why the timing of applying the transform for this case should
influence the results so. Have I missed something?

Regards,

Adriano

===================================

Adriano Gagliardi MEng PhD
Business Sector Leader
Computational Aerodynamics
Aircraft Research Association Ltd.
Manton Lane
Bedford

Tel: 01234 32 4644
E-mail: agagliardi at ara.co.uk
Url: www.ara.co.uk


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