[vtkusers] vtkPlaneSource

[Simon DROUIN]

Call:

SetOfQuadCells->Update()

before trying to get the number of cells. vtk applies a "lazy update"
policy. This means that classes like vtkPlaneSource don't actually build
the geometry until the pipeline they are part of is updated.

-Simon


On Sat, 21 Feb 2004, lisa hughes wrote:

> Hello,
> I have created a vtkPlaneSource object and want to access the quad cells
> created by the plane source
> But first i need to know the number of cells created
> Isnt this just the XResolution times YResolution?? so in my case I should
> get 900 cells?  But the following code outputs 0 cells!! what is wrong with
> what im' doing?  Thanks,
> Lisa
>
> vtkPlaneSource *ColorBlock = vtkPlaneSource::New();
> ColorBlock->SetOrigin(0,0,0);
> ColorBlock->SetPoint1(5,0.5,0);
> ColorBlock->SetPoint2(0,5,0);
> ColorBlock->SetResolution(30,30);
> ColorBlock->SetNormal(0,1,0);
>
>
> vtkPolyData *SetOfQuadCells = vtkPolyData::New();
> SetOfQuadCells = ColorBlock->GetOutput();
> cout<<SetOfQuadCells->GetNumberOfCells();
>
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