Re: [Paraview] Show custom cube axes annotations

Mon, 19 Nov 2012 08:34:27 -0800

Perfect,

Thanks very much for all the help, I finally succeeded to create the filter. I can transform my data (for example, expand one dimension ) and keep the originals labels.

Thanks again,
Felipe

Here is a screen-shot:




Le 18/11/2012 15:48, Sebastien Jourdain a écrit :
Hi Felipe,

Lets state what we know.
U,V and W are 3 unit vectors that describe which axis should be used by the cube axis.
OrientedBounds are 6 values describing the bounds of the data using the U,V and W vectors. [minU, maxU, minV, maxV, minW, maxW]

Then to solve your problem you will have to do the following: 

1) Compute Pmin and Pmax as follow

Pmin = U.OrientedBounds[0] + V.OrientedBouds[2] + W.OrientedBouds[4]
Pmax = U.OrientedBounds[1] + V.OrientedBouds[3] + W.OrientedBouds[5]

2) Apply your transform (Rotation, Scale, Translation) to those 2 points

You get P'min and P'max

3) Apply the rotation ONLY to U,V and W (as translation/scale have no effect on a unit vector)

You get U', V' and W'

4) You resolve the equations

P'min = U'.a + V'.b + W'.c
P'max = U'.d + V'.e + W'.f

And then you get OrientedBounds' = [a,d,b,e,c,f]

And you're done... Do you need anything more ?

Seb


On Fri, Nov 16, 2012 at 6:27 PM, Felipe Bordeu Weldt <felipe.bor...@ec-nantes.fr> wrote:
Ok,

We visualizes data with non convectional axes, so we put that information (name and units) in the labels. Also we want to be able to use the transformation filter to modified the meshes, and we want the axis and labels to follow the transformation. So I'm writing a filter (vtkTransformWithAxis) that apply the transform to the mesh and to all the data that is used for the cube axis.

But I'm not able create correctly the OrientedBoundingBox and the three vectors to generate the Non Orthogonal Bounding Box.

So if the input does not have all the data for the axis, it will generate the data (vector, OriendedBoundigBox... and so on ) , and then apply the transformation filter.

Is that clearer? 

Thanks for you time so far.
Felipe 

Le 16 nov. 12 à 19:33, Sebastien Jourdain a écrit :

Hi Felipe,

could you rephrase your question, as I'm not sure to follow you anymore. Specially what are the piece of informations that are still missing to you.

Thanks,

Seb


On Fri, Nov 16, 2012 at 1:13 PM, Felipe Bordeu <felipebor...@gmail.com> wrote:
I have no problem with the use custom range.

My problem is than I use a home made transform filter to transform my data, our data is sometimes degenerated (one axis is very very small), so we use the transform filter to increase the size of that dimensions. But the problems is that the cube axes does not have the good units any more ( so we want to keep the labels of the input by applying the same transform)

Until now I can apply only translation and scale, not rotation.

note: in the images the little arrow is the original one.

<bhfgfhca.png>
<ddgjfefc.png>


Felipe

Le 16/11/2012 17:47, Sebastien Jourdain a écrit :
Oops,

the "Use Custom Range" will use the text field property but this will add extra information so when you use the QuadView, the QuadView will be able to know what the slices origin is regarding those arbitrary bounds.

Hope that makes a little bit more sense,

Seb


On Fri, Nov 16, 2012 at 11:42 AM, Sebastien Jourdain <sebastien.jourd...@kitware.com> wrote:
Hi Felipe,

if you check "Use Custom Range" the cube axis will use the oriented bounds correctly for the labels instead of using the world space coordinate bounds.
This happen by adding new field data providing the min/max for each axis that should be used for the labels.

Regarding you question the end points of the cube axes will be

Pmin = U*OrientedBounds[0] + V*OrientedBouds[2] + W*OrientedBouds[4]
...
Pmax = U*OrientedBounds[1] + V*OrientedBouds[3] + W*OrientedBouds[5]

Hope that help,

Seb



On Fri, Nov 16, 2012 at 10:02 AM, Felipe Bordeu <felipe.bor...@ec-nantes.fr> wrote:
Hi,

I am trying  to understand how the new annotation for the cube axis works.

I don't understand how to define the OrientedBoundingBox FieldData variable. (I understand the c++ part, that’s easy ;) )
(I'm working with a c++ reader plugin).

What is the relation between the Oriented Bound and the scale and the position of the axis.
<mime-attachment.png> 

    Thanks 

    Felipe

    

    ps: Paraview 3.98.0-RC2 git version, kubuntu 12.04 64.

-- 

Felipe Bordeu Weldt
Ingénieur de Recherche
-------------------------------------
Tél. : 33 (0)2 40 37 16 57
Fax. : 33 (0)2 40 74 74 06
felipe.bor...@ec-nantes.fr
Institut GeM - UMR CNRS 6183
École Centrale Nantes
1 Rue de La Noë, 44321 Nantes, FRANCE
-------------------------------------

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-- 
Felipe Bordeu Weldt
Felipe Bordeu Weldt
Ingénieur de Recherche
-------------------------------------
Tél. : 33 (0)2 40 37 16 57
Fax. : 33 (0)2 40 74 74 06

felipe.bor...@ec-nantes.fr
Institut GeM - UMR CNRS 6183
École Centrale Nantes
1 Rue de La Noë, 44321 Nantes, FRANCE
-------------------------------------



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-- 

Felipe Bordeu Weldt
Ingénieur de Recherche
-------------------------------------
Tél. : 33 (0)2 40 37 16 57
Fax. : 33 (0)2 40 74 74 06
felipe.bor...@ec-nantes.fr
Institut GeM - UMR CNRS 6183
École Centrale Nantes
1 Rue de La Noë, 44321 Nantes, FRANCE
-------------------------------------
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Powered by www.kitware.com

Visit other Kitware open-source projects at 
http://www.kitware.com/opensource/opensource.html

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