[vtkusers] Save as vtu

Fri Apr 28 06:34:37 EDT 2017

OK, so there is no way to convert stl or xmf to vtu ?...

Le 2017-04-27 9:51, houssen a écrit :
> Forgot to attach the files !
>
> Franck
>
> Le 2017-04-27 9:50, houssen a écrit :
>> Hi,
>>
>> First let me describe a bit more the need behind this (to answer
>> Andy's question). I need to visualize some data: I decided to use a
>> vtkUnstructuredGrid as a starting point (because it seems more
>> flexible: you can describe all kind of meshes with that, not only
>> specific ones). For very simple cases, I can build my
>> vtkUnstructuredGrid myself and do stuffs I need to do with it: 
>> that's
>> OK. For more complex cases, I would like to use some external data
>> (stl or xmf for instance): this means I need to build a
>> vtkUnstructuredGrid from stl or xmf (or ideally from any other
>> format). So I was like : "OK, let's try to use the
>> vtkUnstructuredGridReader" (hoping this reader could read any format
>> and convert it to a vtkUnstructuredGrid). It turns out that
>> vtkUnstructuredGridReader is only for vtu, right ? Not such a big 
>> deal
>> anyway if I can convert stl/xmf to vtu: as I didn't succeed to do 
>> that
>> in paraview, I sent this mail.
>>
>> Now to answer your questions/remarks:
>>
>> 1. The xmf defines a multiblock: yes, I noticed that. I already 
>> tried
>> to save as vtm (proposed in the GUI - there was no vtu format
>> available at this step) and get what you said David. But the problem
>> is that when I read the vtm with vtkUnstructuredGridReader, I get :
>> "vtkUnstructuredGridReader (0x55cf2916cc00): Unrecognized file type:
>> <VTKFile type="vtkMultiBlockDataSet" version="1.0"
>> byte_order="LittleEndian" header_type="UInt64"> for file:
>> tstXmfFEM.vtm"
>>
>> 2. I didn't know about the merge blocks filter. I used it: now the
>> "save as" GUI propose to save as vtu. I save as vtu but when I read 
>> it
>> with vtkUnstructuredGridReader, I get : "vtkUnstructuredGridReader
>> (0x5650aee5ec00): Unrecognized file type: <VTKFile
>> type="UnstructuredGrid" version="1.0" byte_order="LittleEndian"
>> header_type="UInt64"> for file: tstXmfFEM.vtu"
>>
>> 3. How to convert a stl to vtu ?
>>
>> Franck
>>
>> Note: I use Paraview-5.1.0 and VTK-7.1.0 (does this trigger version
>> related problems ?)
>>
>> Note: to read with vtkUnstructuredGridreader, I basically do
>> reader->SetFileName(), then reader->Update(), then 
>> reader->GetOutput()
>>
>> Le 2017-04-26 19:03, David E DeMarle a écrit :
>>> Adding to what Andy said.
>>> In this case the xdmf file defines a multiblock with three
>>> unstructured grids underneath it. Each of your unstructured grids
>>> happens to have just one cell in it. When you save as vtm, you will
>>> get a top level .vtm defining the collection, and a directory with
>>> three .vtu files, one for each block.
>>>
>>> David E DeMarle
>>> Kitware, Inc.
>>> R&D Engineer
>>> 21 Corporate Drive
>>> Clifton Park, NY 12065-8662
>>> Phone: 518-881-4909
>>>
>>> On Wed, Apr 26, 2017 at 12:55 PM, Andy Bauer 
>>> <andy.bauer at kitware.com
>>> [12]> wrote:
>>>
>>>> Hi,
>>>>
>>>> The vtu format is for unstructured (non-multiblock) grids. For
>>>> multiblock grids like the ones read in from an xmf file you will
>>>> need to convert it to an unstructured grid. You an use the Merge
>>>> Blocks filter to do that.
>>>>
>>>> Is there a strong reason for saving it as a vtu file? It sounds
>>>> like there are better file formats available for your data set.
>>>>
>>>> Andy
>>>>
>>>> On Wed, Apr 26, 2017 at 12:24 PM, houssen <houssen at ipgp.fr [6]>
>>>> wrote:
>>>>
>>>>> In paraview, I open a xmf file, I would like to export it as vtu
>>>>> (to read it later on with vtkUnstructuredGridReader): neither
>>>>> "save data" nor "export scene" allows this (save data suggest the
>>>>> .vtm format but it turns out that vtm can not be read later on by
>>>>> vtkUnstructuredGridReader as vtu is expected - I guess ?). Same
>>>>> problem when opening a stl file in paraview: can not export it as
>>>>> vtu.
>>>>>
>>>>> How can I export a xmf/stl fle as vtu ? Do I need a (existing ?)
>>>>> plugin ? If yes, which one ? Is there a work around ? Or is this
>>>> a
>>>>> dead end ?
>>>>>
>>>>> Franck
>>>>>
>>>>> PS: I have paraview-5.1.0, should I compile a newer version ?
>>>>>
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