[vtkusers] display tens of thousands of cubes

[Alex Southern]

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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