[Paraview] [EXTERNAL] Re: Calculating the distance between two surfaces as a function of time during large deformation process

[Cory Quammen]

Hi Alan,

I was able to reproduce your problem. I'm not sure why the
programmable filter approach fails, though.

As an alternative, use the attached Poly Data Distance XML plugin
(it's better, anyway, since you don't have to enter the script each
time you use it). Try the following:

- launch ParaView
- Tools -> Manage Plugins... -> Load New...
- Change file type to .xml and select the attached XML plugin file
- open disk_out_ref.exo
- Merge blocks
- Extract surface
- Transform, shifting 20 units in X
- Use PolyData distance plugin

You should have the distance computed on each version of disk_out_ref.exo.

Please let me know how it goes.

Thanks,
Cory

On Wed, Dec 24, 2014 at 8:15 PM, Scott, W Alan <wascott at sandia.gov> wrote:
> Cory,
> Excellent idea.  I did try, and yes - I end up with polydata.  However, I then don't see any output.  Mind giving this a try?  Utkarsh should have disk_out_ref.exo.  What I did;
>
> Read in disk_out_ref.exo.
> merge blocks
> extract surface.
> read in disk_out_ref.exo (yes, I know I could have used the original.  Being pre-Christmas brain dead.)
> transform.  X translation 20.  (disks now have a distance from each other of about 8.5 units.)
> merge blocks
> extract surface.
> highlight each extract surface.
> programmable filter.  Paste in your code.
>
> No output variable named "distance" to be found.
>
> Thanks,
>
> Alan
>
> -----Original Message-----
> From: Cory Quammen [mailto:cory.quammen at kitware.com]
> Sent: Wednesday, December 24, 2014 3:10 PM
> To: Scott, W Alan
> Cc: Biddiscombe, John A.; paraview at paraview.org
> Subject: Re: [EXTERNAL] Re: [Paraview] Calculating the distance between two surfaces as a function of time during large deformation process
>
> Alan,
>
> disk_out_ref.ex2 -> Merge Blocks -> Extract Surface should get you polydata that you can feed into the programmable filter.
>
> Thanks,
> Cory
>
> On Wed, Dec 24, 2014 at 12:44 PM, Scott, W Alan <wascott at sandia.gov> wrote:
>> Very nice and simple!  Thanks.
>>
>> I tried running it on two instances of disk_out_ref.exo, and it complained that it has MultiBlock data as inputs, but needs PolyData.  Being a neophyte with the programmable filter, how can I either convert my data, or convert the filter to use multiblock data?
>>
>> Thanks!!
>>
>> Alan
>>
>> -----Original Message-----
>> From: Cory Quammen [mailto:cory.quammen at kitware.com]
>> Sent: Tuesday, December 23, 2014 8:32 PM
>> To: Biddiscombe, John A.
>> Cc: Scott, W Alan; paraview at paraview.org
>> Subject: [EXTERNAL] Re: [Paraview] Calculating the distance between
>> two surfaces as a function of time during large deformation process
>>
>> Hi Alan,
>>
>> There is a filter in VTK called vtkDistancePolyDataFilter. It takes two polydata as inputs and produces up two two outputs, each with an the (optionally) signed distance from each point in the first polydata to the closest point on the second polydata. If the polydata inputs overlap and the signed distance is requested, the distance may be negative, which means that the point at which the distance is computed is inside the other polydata.
>>
>> Attached is a ParaView 4.2 state file with a Programmable Filter that exposes the vtkDistancePolyDataFilter. It could also be exposed as an XML plugin.
>>
>> Cheers,
>> Cory
>>
>> On Tue, Dec 23, 2014 at 6:20 PM, Biddiscombe, John A. <biddisco at cscs.ch> wrote:
>>> The way I did this was to use one surface as a “source” - fire rays
>>> from this surface along the surface normal until they hit the “target”
>>> and return the distance. Then use the distances for every source node
>>> as a new field which is output. One requires ideally a source mesh
>>> with quite dense points to get a good sampling.
>>>
>>> JB
>>>
>>> On 23/12/14 21:02, "Scott, W Alan" <wascott at sandia.gov> wrote:
>>>
>>>>I have a user that asked the following question.  Any ideas how to do
>>>>this?
>>>>
>>>>Thanks,
>>>>
>>>>Alan
>>>>
>>>>
>>>>Greetings,
>>>>
>>>>I need to quantify the distance between two curved and deforming
>>>>surfaces (large deformation mechanical analysis) as a function of
>>>>time in batch mode. I don't know (and don't want to know) which two
>>>>node points are the closest. Could you outline how you would code up something like this ?
>>>>
>>>>George
>>>>
>>>>
>>>>
>>>>
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>>
>>
>>
>> --
>> Cory Quammen
>> R&D Engineer
>> Kitware, Inc.
>
>
>
> --
> Cory Quammen
> R&D Engineer
> Kitware, Inc.



-- 
Cory Quammen
R&D Engineer
Kitware, Inc.
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