[vtkusers] Re: How to write multiple vtkPolyData into on single XML file

[Peng (Patrick) Cheng]

Hi Goodwin,
Thanks for your help, Can you give me an example on how to "loop 
through" the polydata cells? and how to copy the data to another polydata?
Thanks again.
Patrick

Goodwin Lawlor wrote:
> Hi Patrick,
> 
> Do you want each line to have its own mapper and actor? You may not need
> to... cells can be picked and colored individually. Do you need to be able
> to transform each line?
> 
> You can try to use vtkPolyDataConnectivityFilter for a start... get the
> number of connected regions, then specifiy by region number one at a time
> and then DeepCopy each output into a new vtkPolyData (haven't tried this but
> its a suggestion).
> 
> If you want each cell (be it a line or polyline) to have its own
> mapper/actor, then you can loop through the appended polydata's cells,
> copying each cell's topology (vtkCellArray) and geometry (vtkPoints) into
> its own vtkPolyData.
> 
> hth
> 
> Goodwin
> 
> ps Q's are best kept on the mailing list for posterity
> 
> ----- Original Message ----- 
> From: "Peng (Patrick) Cheng" <peng-cheng at uiowa.edu>
> To: "Goodwin Lawlor" <goodwin.lawlor at ucd.ie>
> Sent: Monday, November 01, 2004 5:46 PM
> Subject: Re: [vtkusers] Re: How to write multiple vtkPolyData into on single
> XML file
> 
> 
> 
>>Hi Goodwin,
>>I have another question, I did as you told me, append the data and write
>>to a single file. and then I can read them back, but it only gives me
>>one dataset, How can I extract the original lines out of the vtkXMLReader?
>>thanks
>>Patrick
>>
>>Goodwin Lawlor wrote:
>>
>>>Hi Patrick,
>>>
>>>Use vtkAppendPolyData to append all your polydatas into one, then write
> 
> this
> 
>>>appended polydata out using vtkXMLWriter.
>>>
>>>hth
>>>
>>>Goodwin
>>>
>>>"Peng (Patrick) Cheng" <peng-cheng at uiowa.edu> wrote in message
>>>news:418177F6.8050800 at uiowa.edu...
>>>
>>>
>>>>hi all,
>>>>
>>>>I have hundreds of vtkPolyData in a list need to be output to a XML
>>>>file, and later on read back. each of them is a line with a points and a
>>>>scalars. I was just wondering is it possible to write all these data
>>>>into  one XML file with current vtkXMLWriter? or do I have to output one
>>>>file for each vtkPolyData?
>>>>
>>>>Patrick
>>>>-- 
>>>>
>>>>Peng (Patrick) Cheng
>>>>Research Assistant
>>>>Radiology, Magnetic Resonance Imaging (MRI) Center
>>>>University of Iowa Hospital and Clinics
>>>>Iowa City, IA 52246
>>>>
>>>>Office:  0453-E JCP
>>>>Phone:   (319)356-7808 (O)
>>>>         (319)400-7442 (C)
>>>>Email:   peng-cheng at uiowa.edu
>>>>Website: http://css.engineering.uiowa.edu/~pcheng/
>>>>
>>>>
>>>>
>>>>_______________________________________________
>>>>This is the private VTK discussion list.
>>>>Please keep messages on-topic. Check the FAQ at:
>>>
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>>>
>>>
>>>
>>>
>>>_______________________________________________
>>>This is the private VTK discussion list.
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> 
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>>
>>-- 
>>
>>Peng (Patrick) Cheng
>>Research Assistant
>>Radiology, Magnetic Resonance Imaging (MRI) Center
>>University of Iowa Hospital and Clinics
>>Iowa City, IA 52246
>>
>>Office:  0453-E JCP
>>Phone:   (319)356-7808 (O)
>>          (319)400-7442 (C)
>>Email:   peng-cheng at uiowa.edu
>>Website: http://css.engineering.uiowa.edu/~pcheng/
>>
>>
>>
>>
> 
> 
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-- 

Peng (Patrick) Cheng
Research Assistant
Radiology, Magnetic Resonance Imaging (MRI) Center
University of Iowa Hospital and Clinics
Iowa City, IA 52246

Office:  0453-E JCP
Phone:   (319)356-7808 (O)
          (319)400-7442 (C)
Email:   peng-cheng at uiowa.edu
Website: http://css.engineering.uiowa.edu/~pcheng/