[Paraview] Design of Multiple Input Filter

[Michael Jackson]

great. Thanks. I actually have the ParaView User Guide for ParaView 3,  
could you point me in the general vicinity in the user guide where  
this is explained? The index wasn't much help but I am probably not  
looking up the correct terms.

Thanks
--
Mike Jackson <www.bluequartz.net>

On Jan 15, 2010, at 1:00 PM, burlen wrote:

> It doesn't have to be be a composite data algorithm or operate on  
> composite data. There are two options available without delving into  
> composite data, 1) make multiple inputs, 2)  make a single input  
> repeatable.
>
>
> in option 1)
>
>   class vtkMyFilter : public vtkImageDataAlgorithm
>   {
>   ...
>   };
>
>   vtkMyFilter::vtkMyFilter()
>   {
>   ...
>   this->SetNumberOfInputPorts(3);
>   }
>
>
> or in option 2)
>
>   class vtkMyFilter : public vtkImageDataAlgorithm
>   {
>   ...
>   };
>
>   vtkMyFilter::vtkMyFilter()
>   {
>   ...
>   this->SetNumberOfInputPorts(1);
>   }
>
>   int vtkMyFilter::FillInputPortInformation(int port, vtkInformation
>   *info)
>   {
>   ...
>   info->Set(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkImageData");
>   info->Set(vtkAlgorithm::INPUT_IS_REPEATABLE(),1);
>   }
>
> during request data in option 1) you get a vector of information  
> objects each with one dataset, in 2) you get a vector of datasets in  
> one information object. The UI differs in the way the inputs are  
> selected, option 1) will be more clear that 3 are required.
>
> This is explained (much better) in the user guide along with  
> composite data algorithm.
>
>
> Michael Jackson wrote:
>> I have an algorithm that needs to take 3 inputs. All three will be  
>> vtkImageData objects using Floating point values. I was wondering,  
>> before I even start anything, does the first data set in the  
>> pipeline have to be a composite data set so if I apply the filter I  
>> can assign specific "pieces" of the composite data set as inputs to  
>> the filter I am designing? What would be an example of a filter  
>> that takes multiple inputs that I could look at as an example?
>>
>> Thanks for any help.
>> ___________________________________________________________
>> Mike Jackson                      www.bluequartz.net
>> Principal Software Engineer       mike.jackson at bluequartz.net
>> BlueQuartz Software               Dayton, Ohio
>>
>>
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