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

[Scott, W Alan]

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.