[vtkusers] rotate vtkPoints with vtkTransform

[Burlen]

Hi, Malcom, thanks for the help.

It still isn't working quite right. I'm trying a simplified version on two 
pionts (center and normal) using translate only. The center point gets 
translated correctly, but the normal point doesn't.  I've never had to work 
with polydata directly, and I was wondering if you see anything that jumps 
out as wrong in my code?

void fmConfigCutPlane::Rx()
{
    double theta = ledRot->text().toDouble();
    
    double *normal = pwid->GetNormal();
    double *center = pwid->GetOrigin();
    
    vtkPoints *data = vtkPoints::New();
    data->SetDataTypeToDouble();
    data->SetNumberOfPoints(2);
    data->SetPoint(0, center);
    data->SetPoint(1, normal);
    
    vtkCellArray *cell = vtkCellArray::New();
    cell->InsertNextCell(2);
    cell->InsertCellPoint(0);
    cell->InsertCellPoint(1);
    
    vtkPolyData *pdata = vtkPolyData::New();
    pdata->SetPoints(data);
    pdata->SetLines(cell);    
    
    vtkTransform *T = vtkTransform::New();
    T->Translate(-1.0*center[0], -1.0*center[1], -1.0*center[2]);
    //T->RotateX(theta);
    //T->Translate(center[0], center[1], center[2]);
    
    vtkTransformFilter *Tf = vtkTransformFilter::New();
    Tf->SetInput(pdata);
    Tf->SetTransform(T);
    Tf->Update();
    
    
    vtkPoints *Tdata = Tf->GetOutput()->GetPoints();
    
    center = Tdata->GetPoint(0);
    normal = Tdata->GetPoint(1);
    
    pwid->SetOrigin(Tdata->GetPoint(0));
    pwid->SetNormal(Tdata->GetPoint(1));
    thisModule->broadcastMessage(PROPAGATE_DOWN, REPAINT);
    
}

On Tuesday 05 July 2005 11:36 am, Malcolm Drummond wrote:
> Hi Burlen
> 
> Use a vtkTransformPolyDataFilter (this will require a vtkTransform as well 
> as an input) and just call Update on the filter - after which you can 
> accesss the transformed points through GetOutput.
> 
> HTH
> Malcolm Drummond
> GeoVision cc
> 
> ----- Original Message ----- 
> From: "Burlen" <burlen at apollo.sr.unh.edu>
> To: <vtkusers at vtk.org>
> Sent: Tuesday, July 05, 2005 5:08 PM
> Subject: [vtkusers] rotate vtkPoints with vtkTransform
> 
> 
> > Hi does anyone know how to rotate just vtkPoints? I have my data in 
> > vtkPoints, I want to rotate them about an axis, then get the result, 
> > without ever rendering them.
> > All the examples I have seen work with objects that have SetTransform 
> > method, and then you don't ever get the result, it apears in the rendered 
> > scene. vtkPoints doesn't have a SetTransform method...
> >
> > ANy ideas?
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