[Paraview] dataset questions

[John Doe]

Hi Sam,

Thanks for the excellent ideas.

Since:
1 I have on average 2 triangles for every line.

2. And having zero data for the triangles interspersed with nonzero
data for the lines may not work out so well.

Perhaps I can have a vtk file for lines and a vtk file for triangles?

I can only find documentation online for the vtk format.  Is there
documentation for the pvd format?  The example file I saw online is
xml like, I guess this implies that I'd have to use xml for the
individual data files?

Thanks,

Juan



On Thu, Jun 5, 2008 at 1:57 PM, SamuelKey <samuelkey at comcast.net> wrote:
> Juan,
>
> For what it is worth here is my 2 centavos,
>
> First, I would consider the VTK XML data format.
>
> Second, I have found that it works really well to consider each *.vt* file
> as an independently displayable graphics object. One then uses a *.pvd
> meta-file (an ASCII "mother" file) to get PV to read them all at once.
>
> Parallel generated data sets are managed this way. I use this approach to
> generate separate objects based on material type. PV does not care (or know)
> that they were not generated in parallel. As independently displayable
> graphics objects, they need to have their own point sets. PV doesn't worry
> about one or more points having "matching" locations.
>
> Each object has its own set of iso-surfaces so that on boundaries the data
> from each side is used and you get disconnected iso-surfaces which in my
> case is exactly what I want.
>
> The question of different fields/data on different objects someone else will
> need to answer. (You can always flesh out zero's.)
>
> Sam Key
>
> John Doe wrote:
>>
>> I was going to use implement a vtk writer for my program.  I would
>> like to use the vtk ascii datafile format.  A few questions:
>>
>> 1. I have multiple regions.  Some of these regions share coordinates
>> at an interface.  Do I have to average the data on both sides of the
>> interface, or is there a way to put 2 values at the same point?  Will
>> paraview complain about duplicate coordinates (collinear points)?
>>
>> 2. Some data fields only exist in certain regions.  Does that mean I
>> have to set 0 values in the regions the field does not exist?
>>
>> 3. I have points, lines, and triangles.  If I put data on lines, does
>> that mean I have to define the same data fields on all of the other
>> cell types in my design as well?  For example, I have current flowing
>> along lines, but not through triangles.  So it wouldn't make sense to
>> have current data defined for the triangles.
>>
>> Thanks,
>>
>> Juan
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>