[vtkusers] Improve the Rendering Performance...

[Gatos Gatos]

Hi
I would like to know if there is any way to to improve the performance on 
the
following code.

I run the following example with 100000 points (here only 6) and starts to 
be slow.

I played with the
vtkTriangleFilter,
vtkStripper ,
and the ImmediateModeRenderingOff();

but it looks that there is no difference in preformance.

Also how can I use the filter after I initialize the actor (eg: during the 
interaction)?
//filter->SetTargetReduction(0.5);
Is it any way or I have to reconstruct the triangle mesh from the begining?

Thank you very much in advance

kostas


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vtkFloatArray* pcoords = vtkFloatArray::New();
pcoords->SetNumberOfComponents(3);
pcoords->SetNumberOfTuples(6);
float pts[6][3] = { {0.0, 0.0, 0.0}, {0.0, 1.0, 0.0},
  		   {1.0, 0.0, 0.0}, {1.0, 1.0, 0.0},
		   {2.0, 0.0, 0.0}, {2.0, 1.0, 0.0} };

for (int i=0; i<6; i++) { pcoords->SetTuple(i, pts[i]);	}
vtkPoints* points = vtkPoints::New();
points->SetData(pcoords);

// Create the dataset. In this case, we create a vtkPolyData
vtkPolyData* polydata = vtkPolyData::New();
// Assign points and cells
polydata->SetPoints(points);

vtkTriangle *triangle;
vtkCellArray*  tris = vtkCellArray::New();
triangle=vtkTriangle::New();
triangle->GetPointIds()->SetId(0,0);
triangle->GetPointIds()->SetId(1,2);
triangle->GetPointIds()->SetId(2,1);
tris->InsertNextCell(triangle);
triangle->Delete();

polydata->SetPolys(tris);

//vtkDecimatePro * filter = vtkDecimatePro::New();
//filter->SetInput(polydata);
//filter->SetMaximumError(0);
//filter->SetTargetReduction(0.5);
//polydata = (vtkPolyData*) filter->GetOutput();

vtkTriangleFilter *vtf = vtkTriangleFilter::New();
vtf->SetInput(polydata);
polydata = (vtkPolyData*) vtf->GetOutput();

vtkPolyDataNormals *bNormals = vtkPolyDataNormals::New();
bNormals->SetInput(polydata);
//bNormals->SetFeatureAngle(60.0);

vtkStripper *bStripper = vtkStripper::New();
bStripper->SetInput(bNormals->GetOutput());

//Create the mapper
vtkPolyDataMapper* mapper = vtkPolyDataMapper::New();
mapper->SetInput(bStripper->GetOutput());
mapper->ScalarVisibilityOff();
mapper->ImmediateModeRenderingOff();

// Create an actor.
vtkActor* actor = vtkActor::New();
actor->SetMapper(mapper);
actor->GetProperty()->SetColor(1,1,0);

renderer->AddActor(actor);