Re: [vmtk-users] Mapping and Patching Data

[Evan K. <to...@gm...>]

Thanks, Arjan.  That was an extremely helpful explanation.

On Wed, Feb 20, 2013 at 4:40 PM, Arjan Geers <aj...@gm...> wrote:

> Hi Evan,
>
> VTK polydata files store the location of points and information on how
> these points are connected to form cells. Additionally, they can store
> scalars and vectors at each point or cell. So, indeed, you want the WSS
> field already included in the surface file before performing any
> vmtkbranch* operations.
>
> Hopefully, you can export from your CFD solver an ASCII file similar to
> surface.tec (attached). It contains x,y,z-coordinates of each point, the
> wss magnitude at each point, and connectivity information. When opening
> this surface with vmtksurfacereader, VMTK converts it into a VTK polydata,
> which can then be written with vmtksurfacewriter (see surface.vtp
> attached). To check what VMTK actually does when converting the ASCII file,
> go to the function 'ReadTecplotSurfaceFile' in vmtksurfacereader.py. This
> should provide you with some hints on how to convert your own format to
> VTP.
>
> Hope this helps,
>
> Arjan
>
> PS: Since the commercial CFD solver Ansys-CFX is quite widely used, the
> attached script cfx2vtp.py (variation on above-mentioned
> 'ReadTecplotSurfaceFile') might be useful to some reading this email.
> Converting surface.csv (attached) should give surface.vtp again.
>
>
> On Wed, Feb 20, 2013 at 9:40 PM, Evan Kao <to...@gm...> wrote:
>
>> Hello,
>>
>> I am confused about some of the details regarding the matching and
>> patching of data in the tutorial.  Specifically, at what stage in the
>> process are we supposed to import the simulation data into vmtk, and how?
>> For instance, in the tutorial, are the WSS and OSI distributions already
>> part of the surface file ("aorta.vtp") before any processing occurs?  It
>> doesn't seem like there are any ways to import data in any of the
>> vmtkbranchmetrics, vmtkbranchmapping, or vmtkbranchpatching functions.  And
>> what form does the data have to be in?  It should be pretty easy to export
>> nodal or cell CFD data as an array, but how would we incorporate that into
>> vmtk?
>>
>> Thanks for your time,
>> Evan Kao
>>
>>
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>