[vtkusers] usage of vtkCompositePolyDataMapper

[Clinton Stimpson]

Then maybe you're missing a

compositeDataSet->Modified();

after you fill it up with data.

Clint

On 08/25/2009 08:04 PM, Alex Malyushytskyy wrote:
> Clinton ,
>
> Thanks a lot for suggestion.
>
> But for some reason using GetProducerPort() did not work - nothing is shown.
> If I create vtkCompositeDataGeometryFilter and use it GetOutputPort( 0
> ) to provide  port for
> compositePolyDatamapperMapper->SetInputConnection,  as in the code
> below, it does.
>
> If anybody could provide better solution, I would appreciate it.
>
>
> Regards,
>        Alex
>
>
> // create renderer, attach to window
>
> 	ren = vtkSmartPointer<vtkRenderer>::New();
>
> 	this->GetRenderWindow()->AddRenderer(  ren );
> 	initBackground();
>
>
> 	compositeDataSet = vtkSmartPointer<vtkMultiBlockDataSet>::New();
>
>   // geometry filter
>          vtkSmartPointer<vtkCompositeDataGeometryFilter>  geom =
> vtkSmartPointer<vtkCompositeDataGeometryFilter>::New();
>          geom->SetInput( compositeDataSet );
>
> // mapper
> 	compositePolyDatamapperMapper =
> vtkSmartPointer<vtkCompositePolyDataMapper>::New();
> 	compositePolyDatamapperMapper->SetInputConnection(0,
> geom->GetOutputPort( 0 ) );   // This works
> //	compositePolyDatamapperMapper->SetInputConnection(0,
> compositeDataSet->GetProducerPort() ); // this does not work
>
> // actor
> 	lodActor = vtkSmartPointer<vtkLODActor>::New();
> 	lodActor->SetMapper( compositePolyDatamapperMapper );
> 	ren->AddActor(lodActor );
>
>   // fill the composite data set, render, update window
> 	createRegionFromStl();
>
>
> On Tue, Aug 25, 2009 at 5:04 PM, Clinton Stimpson<cjstimpson at gmail.com>  wrote:
>    
>> On 08/25/2009 05:34 PM, Alex Malyushytskyy wrote:
>>      
>>> I am new to VTK, so if you see problem with general design or logic
>>> below, all comments are appreciated.
>>>
>>> My application needs to display a set of geometrical blocks. Each
>>> block is represented as a set of triangles.
>>> I decided to create a vtkMultiBlockDataSet object with blocks defined
>>> as vtkPolyData:
>>>
>>> Assume the data is stored in:
>>>        vtkSmartPointer<vtkMultiBlockDataSet>    compositeDataSet;
>>>
>>> Now I need to create and assign the mapper and actor.
>>> I think I can have single mapper and actor,  because all the data is
>>> the same type.
>>>
>>> If it were just single vtkPolyData, I could write something like:
>>>
>>>      vtkSmartPointer<vtkPolyData>    polyData =
>>> vtkSmartPointer<vtkPolyData>:: New();
>>>      // fill poly data  here
>>>        ..................
>>>
>>>      // create mapper and actor
>>>      vtkSmartPointer<vtkPolyDataMapper>    mapper =
>>> vtkSmartPointer<vtkPolyDataMapper>::New();
>>>      mapper->SetInput( polyData );
>>>
>>>      vtkLODActor *actor = vtkLODActor::New();
>>>      actor->SetMapper(mapper);
>>>
>>>
>>> I was looking for mapper which would work for poly data sets and found
>>> vtkCompositePolyDataMapper.
>>> But it is not clear for me how to use it in my case.
>>>
>>> First of all vtkCompositePolyDataMapper seems does not have
>>> SetInput( ) method.
>>> It seems the only input can be specified is output of another filter with:
>>>
>>> vtkCompositePolyDataMapper::SetInputConnection(int port,
>>> vtkAlgorithmOutput* input);
>>>
>>> But I don't have any filter at this point, only vtkMultiBlockDataSet
>>> which contains vtkPolyData is available.
>>>
>>> Does it mean I have to iterate through vtkMultiBlockDataSet  myself
>>> and create mapper for each vtkPolyData, instead of using
>>> vtkCompositePolyDataMapper or there is  a way to use
>>> vtkCompositePolyDataMapper in such situation ?
>>>
>>>
>>>        
>> You can use vtkMultiBlockDataSet::GetProducerPort() as an argument to
>> vtkCompositePolyDataMapper::SetInputConnection().
>>
>> Clint
>>
>>
>>      
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