[vtkusers] display tens of thousands of cubes

[Alex Southern]

I made the changes using the vtkAppendPolyData approach, see code below.

This did improve the interaction alot, but it was still a little 
slugish. Is this because I implemented badly?

Thanks
Alex

// Create a cube.
     vtkCubeSource **cubeSource = new vtkCubeSource* [ca.numCubes];
     vtkSmartPointer<vtkAppendPolyData> appendFilter = 
vtkSmartPointer<vtkAppendPolyData>::New();

     for (int i = 0; i < ca.numCubes; i++)
     {
         cubeSource[i] = vtkCubeSource::New();
         cubeSource[i]->SetCenter(ca.cubeCentre[i].x ,ca.cubeCentre[i].y 
,ca.cubeCentre[i].z );
         cubeSource[i]->SetXLength(ca.cubeLength[i] );
         cubeSource[i]->SetYLength(ca.cubeLength[i] );
         cubeSource[i]->SetZLength(ca.cubeLength[i] );

         
appendFilter->AddInputConnection(cubeSource[i]->GetOutput()->GetProducerPort()); 


     }
     appendFilter->Update();

     // Remove any duplicate points.
     vtkSmartPointer<vtkCleanPolyData> cleanFilter =    
vtkSmartPointer<vtkCleanPolyData>::New();
     cleanFilter->SetInputConnection(appendFilter->GetOutputPort());
     cleanFilter->Update();

     // create mapper
     vtkSmartPointer<vtkPolyDataMapper> mapper = 
vtkSmartPointer<vtkPolyDataMapper>::New();
     mapper->SetInputConnection(cleanFilter->GetOutputPort());

     vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
     actor->SetMapper(mapper);
     actor->GetProperty()->SetColor(255,0,0);
     actor->GetProperty()->SetRepresentationToWireframe();

     renderer->AddActor(actor);

etc....

On 2/7/2012 6:39 PM, Bryn Lloyd wrote:
> Use the glyph mapper for even faster GPU rendering.
>
> http://www.vtk.org/doc/nightly/html/classvtkGlyph3DMapper.html
>
>
> On 2/7/2012 5:17 PM, David E DeMarle wrote:
>>
>> Use the glyph filter to make one actor with thousands of cubes.
>>
>> On Feb 7, 2012 11:12 AM, "Alex Southern" <mrapsouthern at gmail.com 
>> <mailto:mrapsouthern at gmail.com>> wrote:
>>
>>     Hi,
>>
>>     I'm wondering what the best way to do this is?
>>
>>     Currently the cubes are defined in a dynamic array of
>>     vtkCubeSources, see code below. This results in very slow
>>     interaction.
>>
>>     Is there a more lightweight approach to this problem? There is a
>>     typical image below.
>>
>>     // Create a cube array.
>>         int numCubes = 44582; // in practice this value could be anything
>>         vtkCubeSource **cubeSource = new vtkCubeSource* [numCubes];
>>         vtkPolyDataMapper **mapper = new vtkPolyDataMapper* [numCubes];
>>         vtkActor **actor = new vtkActor* [numCubes];
>>
>>         for (int i = 0; i < ca.numCubes; i++)
>>         {
>>             cubeSource[i] = vtkCubeSource::New();
>>             mapper[i] = vtkPolyDataMapper::New();
>>             actor[i] = vtkActor::New();
>>
>>             cubeSource[i]->SetCenter(ca.cubeCentre[i].x ,
>>     ca.cubeCentre[i].y, ca.cubeCentre[i].z);
>>             cubeSource[i]->SetXLength(ca.cubeLength[i] );
>>             cubeSource[i]->SetYLength(ca.cubeLength[i] );
>>             cubeSource[i]->SetZLength(ca.cubeLength[i] );
>>
>>            
>>     mapper[i]->SetInputConnection(cubeSource[i]->GetOutputPort());
>>             actor[i]->SetMapper(mapper[i]);
>>             actor[i]->GetProperty()->SetColor(255,0,0);
>>             actor[i]->GetProperty()->SetRepresentationToWireframe();
>>
>>             renderer->AddActor(actor[i]);
>>
>>         }
>>
>>
>>
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