[vtkusers] vtkPoints array management

[Fred Fred]

Ok thank you for the tip but this involves a copy of the points, I would have appreciated a way of traversing the list of points while avoiding copies.

> Date: Fri, 11 Sep 2009 10:20:36 -0400
> Subject: Re: [vtkusers] vtkPoints array management
> From: bill.lorensen at gmail.com
> To: stan1313 at hotmail.fr
> CC: vtkusers at vtk.org
> 
> Avoid using GetPoint(id). It calls this->GetData->GetTuple(id). The
> comments for GetTuple say it all...
>   // Description:
>   // Get the data tuple at ith location. Return it as a pointer to an array.
>   // Note: this method is not thread-safe, and the pointer is only valid
>   // as long as another method invocation to a vtk object is not performed.
>   virtual double *GetTuple(vtkIdType i) = 0;
> 
> Use
> double pts0[3];
> points->GetPoint(0, pts0);
> 
> double ptsn[3];
> points->GetPoint(1, ptsn);
> 
> Bill
> 
> On Fri, Sep 11, 2009 at 8:52 AM, Fred Fred <stan1313 at hotmail.fr> wrote:
> > Look at this men:
> >
> >   vtkPoints *points = vtkPoints::New();
> >   [...some point adding steps...]
> >   int numPts = points->GetNumberOfPoints();
> >   printf("numPts=%d\n", numPts);
> >   double *pts0 = points->GetPoint(0);
> >   double *ptsn = points->GetPoint(1);
> >   printf("%p %p\n", pts0, ptsn);
> >
> > which leads:
> >
> > numPts=11
> > 0x19982c40 0x19982c40
> >
> > Whatever the possibility I Made some mistake anywhere, I can not understand
> > how this is possible!
> > GetPoint(0) returns the same address as GetPoint(1) while there are 11
> > points in the array!!!
> >
> >
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