[vtkusers] Sub-classing vtkContourLineInterpolator - adds default straight lines also

[Gishara Indeewarie]

Hi all,

I am sorry have asked this question once and did not get any response, I am
still trying this , So I am asking the question again.

I wanted to add cnurb interpolation to my contour representation. So I
sub-classed the vtkContourLineInterpolator and added my interpolation in
the method, virtual int InterpolateLine. My problem is I am getting the
intermediate points I have added plus straight lines between nodes. I am
using AddIntermediatePointWorldPosition method to add points between nodes.
And when I try to change the contour by dragging control points the
straight lines are changed (which were added by deafault.), not the points
I have added. Below is the piece of code where I call for the sub class.

vtkSmartPointer cnurbInterpolater = vtkSmartPointer::New();

cnurbInterpolater->pNurb =  pNurb;
cnurbInterpolater->size = size;
cnurbInterpolater->x = x;
cnurbInterpolater->y = y;
cnurbInterpolater->z = z;
cnurbInterpolater->MaximumCurveError = 0.0000001;
cnurbInterpolater->MaximumCurveLineSegments = 10000;
contourRep->SetLineInterpolator(cnurbInterpolater);

And below is my class that sub classed the vtkContourLineInterpolator:

class CnurbsInterpolate:public vtkContourLineInterpolator {

public:

CNurbsCurve* pNurb;
vtkSmartPointer<vtkPoints> points;
double * x;
double * y;
double * z;
double MaximumCurveError ;
    int    MaximumCurveLineSegments;
int size;
public:

static CnurbsInterpolate *New()
{
  return new CnurbsInterpolate;
}CnurbsInterpolate() {}

int InterpolateLine( vtkRenderer *vtkNotUsed(ren),

vtkContourRepresentation *rep,
                                                   int idx1, int idx2 )

{

double *controlPointsStack2 = new double[3];
 this->pNurb->Interpolate(x,y,z, size+2 );
for(int i=0; i<=100; i++)
        {
            double Uiter = double(i)/100.0;
            double xn,yn,zn;
            this->pNurb->GetPoint(Uiter,xn,yn,zn);

            controlPointsStack2[0] = xn;
            controlPointsStack2[1] = yn;
            controlPointsStack2[2] = zn;
            if(i>=0 && i<12){
                rep->AddIntermediatePointWorldPosition(0,controlPointsStack2);
            }
            else if (i>=12 && i<57){
                rep->AddIntermediatePointWorldPosition(1,controlPointsStack2);
            }else if (i>=57 && i<95){

this->Representation->AddIntermediatePointWorldPosition(2,controlPointsStack2);
            }
            else{
                rep->AddIntermediatePointWorldPosition(3,controlPointsStack2);
            }
        }

delete [] controlPointsStack2;

return 1;}

I have discussed the problem in stackoverflow as well:

http://stackoverflow.com/questions/11789097/sub-classing-vtkcontourlineinterpolator-adds-default-straight-lines-also

Please help me. Thanks a lot.
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