[Paraview] Distance visualisation

[David E DeMarle]

If you are fortunate your input data sets will have ID's that you can use to
establish the correspondance between the two. Using the ID's to find and
compare like cells/points would result in a much faster algorithm than would
recovering the correspondance manually as Paul suggests.

David E DeMarle
Kitware, Inc.
R&D Engineer
28 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-371-3971 x109


On Mon, Oct 5, 2009 at 3:17 AM, Paul Edwards <paul.m.edwards at gmail.com>wrote:

> Hi Bastil,
>
> I did something similar where I was calculating the wall distance for a
> volume.  You can create a filter that takes two inputs.  First build a
> vtkCellLocator with one input.  Then iterator over the points in the other
> input and use the FindClosestPoint method.
>
> Note: this is quite slow.
>
> Regards,
> Paul
>
>
> 2009/10/4 Bastil2001 at yahoo.de <Bastil2001 at yahoo.de>
>
> True. However, I have no 1:1 correspondance since geometries have
>> certain areas where they differ. I guess I need some kind of octree
>> tocalculate distance....
>>
>> Regards BastiL
>>
>> dave.demarle at kitware.com schrieb:
>>  > Assuming the topology is the same and a 1:1 correspondance between the
>> two, it would be very easy to do with the python programmable filter.
>> >
>> > Script would:
>> > get hold of both input data sets
>> > copy either to the output data set
>> > make a new point associated double array and add it to the output
>> > make the array 3 components wide
>> > iterate over points
>> >   store del x,y,z in output array
>> >
>> > See the paraview wiki for examples that get0you 90% of the way there.
>> > -----Original Message-----
>> >
>> > From:  BastiL2001 <bastil2001 at yahoo.de>
>> > Subj:  Re: [Paraview] Distance visualisation
>> > Date:  Sun Oct 4, 2009 9:12 am
>> > Size:  1K
>> > To:  Berk Geveci <berk.geveci at kitware.com>
>> > cc:  paraview at paraview.org
>> >
>> > Ok it is lets say the "normal distance" between the elements. These two
>> meshes represents two geometries which are very simular and I simply want to
>> visualise where and how much the geometries differ....
>> >
>> > Regards.
>> >
>> >
>> >
>> >
>> > How do you define distance?
>> >
>> > On Sun, Oct 4, 2009 at 9:04 AM, BastiL2001 <bastil2001 at yahoo.de> wrote:
>> >
>> >> Dear all,
>> >>
>> >> I am currently looking for a way to visualise the distance between two
>> unstructured 2D-grids. This means I would need a scalar field with the
>> distance between the two grids which I want to visualise as a contour of one
>> of the two grids.
>> >> Is there a way in Paraview to create this "distance" scalar field?
>> Thanks.
>> >>
>> >> BastiL
>> >>
>> >>
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