[vtkusers] How to get data ptr from the vtkpolydata?

Lin M majcjc at gmail.com
Wed Sep 17 07:52:38 EDT 2014

Thank you for your advice, David.

I made a mistake, m_SkullMesh is a vtkOBJReader and the
m_SkullMesh->GetOutput() should be a vtkPolyData.

I hope to get the point array of it. The code I wrote before could work

int meshNum = m_SkullMesh->GetOutput()->GetNumberOfPoints();
double *skullTemplate = new double[3*meshNum];
for(int i = 0; i < meshNum; ++i) {
double* temp = m_SkullMesh->GetOutput()->GetPoint(i);
skullTemplate[3*i] = temp[0];
skullTemplate[3*i+1] = temp[1];
skullTemplate[3*i+2] = temp[2];

But I think it should have a better way to avoid the copy and get the data
pointer directly. Can you give me some suggestion? Thank you!


On Wed, Sep 17, 2014 at 7:41 PM, David Doria <daviddoria at gmail.com> wrote:

> On Wed, Sep 17, 2014 at 7:17 AM, Lin M <majcjc at gmail.com> wrote:
>> Hi all,
>> I try to get the data ptr which I think is a double * pointing to a
>> double array from vtkpolydata but I met an access violation when I use
>> double *skullTemplate =
>> vtkDoubleArray::SafeDownCast(m_SkullMesh->GetOutput()->GetPoints()->GetData())->GetPointer(0);
>> m_SkullMesh is a vtkPolyData.
>> How can I do to get it work? Thank you!
>> Best,
>> Lin
> Please post the smallest, compilable code you can that demonstrates the
> problem. From what you've shown, one error is that you shouldn't have to
> GetOutput() from a vtkPolyData.
> David
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