[vtkusers] About vtkCellCenters

[Wenlong]

Dear all,

I have a 3D surface which is comprised of 9000 triangles. I'm trying to
compute the center point coordinates of polygons on the surface.

I know there is a class vtkCellCenters can get access to the center of
cells. But I am wondering if the following codes have the same results as
vtkCellCenters?

vtkPolyData* polydata;
vtkCellArray* polygon;
double center[9000][3], pointA[3], pointB[3], pointC[3], ID[3];

for(int i = 0; i < 9000; i++)
{
     polygon->GetPoly(i, ID);
     polydata->GetPoint(ID[0], pointA);
     polydata->GetPoint(ID[1], pointB);
     polydata->GetPoint(ID[2], pointC);
     center[i][0] = (pointA[0] + pointB[0] + pointC[0]) / 3;
     center[i][1] = (pointA[1] + pointB[1] + pointC[1]) / 3;
     center[i][2] = (pointA[2] + pointB[2] + pointC[2]) / 3;
}

Is there any difference to use above code block?

Many thanks.

Wenlong

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