<p>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"). <br>
Regards,<br>
Paul</p>
<p><blockquote type="cite">On 25 Nov 2010 10:44, "Adriano Gagliardi" <<a href="mailto:agagliardi@ara.co.uk">agagliardi@ara.co.uk</a>> wrote:<br><br><br>
Dear All,<br>
<br>
I've come across some strange behaviour using the transform filter. I have<br>
two pipelines that are near identical. Infact, the only difference is the<br>
point at which a transform about a single axis is applied. The process is as<br>
follows:<br>
<br>
1 Read Data<br>
2 Extract Blocks<br>
3 Extract Surface<br>
4 Generate Surface Normals<br>
5 Calculator (create vector, var*Normals)<br>
6 Calculator (create vector from scalars)<br>
7 Integrate data<br>
<br>
If I apply the transform at any point before step 6, I get one set of<br>
integrated values. If I apply it after step 6, then my x components of the<br>
first vector & z component of the second vector are completely different<br>
(even different signs), but the others still agree well. I noticed that the<br>
transform filter was actually converting the value computed in item 6 from a<br>
double to a float, so I changed this last night and recompiled. I also<br>
changed the vtkPolyDataNormals to use doubles instead of floats. However,<br>
neither of these changes has helped the issue.<br>
<br>
I fail to see why the timing of applying the transform for this case should<br>
influence the results so. Have I missed something?<br>
<br>
Regards,<br>
<br>
Adriano<br>
<br>
===================================<br>
<br>
Adriano Gagliardi MEng PhD<br>
Business Sector Leader<br>
Computational Aerodynamics<br>
Aircraft Research Association Ltd.<br>
Manton Lane<br>
Bedford<br>
<br>
Tel: 01234 32 4644<br>
E-mail: <a href="mailto:agagliardi@ara.co.uk">agagliardi@ara.co.uk</a><br>
Url: <a href="http://www.ara.co.uk" target="_blank">www.ara.co.uk</a><br>
<br>
<br>
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</blockquote></p>