[Paraview] vtkJPEGReader as Plugin - Loading Volumes

[Christian Werner]

Hello,

thanks for the quick response!
The one thing I am missing is where in your sprintf example 
"this->FilePrefix" and "this->SliceNumber" comes from. In Paraview I get 
an OpenFile Dialog which probably comes up because the plugin is defined 
as a source. Maybe it is because there is an <FileListDomain> markup, 
though.
When I then choose a file (actually I can select "image-..", for the 
whole series) this is internally passed as the parameter to the 
"SetFilePattern" Command in the JPEGReader Plugin (ist that so?). This 
seems to be what I set up in the appropriate .xml file.
I do have to make sure that when this function is called the actual 
FilePattern is passed that contains the image prefix. But editing the 
.xml file I have no clue how to reference the filename which is of 
course variable. (This would be the "this->FilePrefix" in your example) 
and mix it up with these %s and %d (where I don't know how Paraview 
fills them). Put together, I am somewhat lost.

Best regars,
Christian



Utkarsh Ayachit wrote:
> If you look at the documentation for the class and the corresponding
> methods : SetFilePrefix and SetFilePattern, you'll see that it
> mentions what the pattern is supposed to be.
> http://www.vtk.org/doc/nightly/html/classvtkImageReader2.html#a22d3f734323da8d5baaf798bbd7b4bc5 
>
>
> This FilePattern is indeed a sprintf syntax, I am not sure how come
> you don't see the commonality.
>
> sprintf(foo, "%s/image%d.jpeg", this->FilePrefix, this->SliceNumber)
>
> will give you "<somepath>/image<some number>.jpeg" which is what the
> reader tries.
>
> There's nothing  magical in the XML here. It's the reader that's
> dictating how it decides to read the files or determine filenames etc.
> You might want to look at the implementation of vtkImageReader2 to
> understand more.
>
>
> Utkarsh
>
>
> On Mon, Feb 8, 2010 at 3:19 PM, Christian Werner
> <christian.werner at rwth-aachen.de> wrote:
>  
>> I am trying hard, but I just don't get the point. I'd love to read me 
>> into
>> this .xml editing, but there's no source for that, except of the book 
>> which
>> seems to be an overkill for my needs.
>>
>> I feel that in "%s/image%d.jpg" some pointer to the real filename is 
>> missing
>> (it does not work as such). %s seems to be the directory, %the slice 
>> number,
>> so is there a variable like %f for the filename? I know the fprint 
>> syntax
>> but I just can't see any commonality here.
>>
>> If it happens that the book is the only source for a good 
>> introduction to
>> this topic than somebody please tell me. I really do not intend to annoy
>> anyone, but I am having problems finding good documenation here, so I 
>> chose
>> this Mailing List as a guide.
>>
>> Best regards,
>> Christian
>>
>>
>> Utkarsh Ayachit wrote:
>>    
>>> The problem seems to be that you are using the Pattern incorrectly. It
>>> should be of the form: "%s/image%d.jpg" where %s gets replaced by the
>>> directory while %d gets replaced by the slice number.
>>>
>>> Utkarsh
>>>
>>> On Sat, Feb 6, 2010 at 4:52 PM, Christian Werner
>>> <christian.werner at rwth-aachen.de> wrote:
>>>
>>>      
>>>> Hi there!
>>>>
>>>> I'm having trouble getting the vtkJPEGReader to work properly as 
>>>> plugin.
>>>> Specifically I don't know how to set up the approriate .xml file. It
>>>> works
>>>> with command="SetFileName" perfectly, but that way I am getting the 
>>>> first
>>>> slice only. I see that one should use SetFilePrefix and/or
>>>> SetFilePattern,
>>>> but how can I make Paraview pass the appropriate parameters to the
>>>> plugin??
>>>>
>>>> This is how my .xml looks like, it's just a guess, I really don't know
>>>> better:
>>>>
>>>> <ServerManagerConfiguration>
>>>>  <ProxyGroup name="sources">
>>>>  <SourceProxy name="JPEGImageReader"
>>>>              class="vtkJPEGReader"
>>>>              label="JPEG reader">
>>>>   <Documentation
>>>>     short_help="Read a JPEG file."
>>>>     long_help="Read a JPEG file into an image data.">
>>>>     The JPEG image reader reads JPG files, and the output is a uniform
>>>> rectilinear (image/volume) dataset. The default file extension is 
>>>> .jpg.
>>>>   </Documentation>
>>>>  #will become e.g. /home/christian/jpegs
>>>>   <StringVectorProperty
>>>>      name="Files"
>>>>      animateable="0"
>>>>      command="SetFilePrefix"
>>>>      number_of_elements="1">
>>>>      <FileListDomain name="files"/>
>>>>      <Documentation>
>>>>        This property specifies the File Prefix for the JPEG reader.
>>>>      </Documentation>
>>>>      <Hints>
>>>>        <UseDirectoryName />
>>>>      </Hints>
>>>>   </StringVectorProperty>
>>>>   #file pattern
>>>>   <StringVectorProperty
>>>>     name="Pattern"
>>>>     animateable="0"
>>>>     command="SetFilePattern"
>>>>     number_of_elements="1"
>>>>     default_value="/*.jpg">
>>>>   </StringVectorProperty>
>>>>  <!-- End JPEGImageReader -->
>>>>  </SourceProxy>
>>>>  </ProxyGroup>
>>>> </ServerManagerConfiguration>
>>>>
>>>> With that, I get
>>>>
>>>> Unable to open file /home/christian/jpges.0
>>>>
>>>>
>>>> when trying to open a set of jpges...
>>>>
>>>> Does anyone have any idea? I'd also like to know where there is
>>>> documentation on all these markups like what you can put in <Hint>, 
>>>> etc..
>>>>
>>>>
>>>> Best regards,
>>>> Christian
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>>>>         
>>