[vtkusers] get vtkImageData point

[arwtyxouymz]

Thank you Bill!

I read the document of vtkImageData::ComputeStructuredCoordinates, but I
don't know the parameters.

The definition is :
virtual int vtkImageData::ComputeStructuredCoordinates(const double x[3],
int ijk[3], double pcoords[3])

I know x is the real world x-y-z coordinate, and ijk is image point, but
what is pcoords???
pcoords is the parametric coordinates in the cell, but i don't know that.

And i thought the usage :

const double p[3] = {x, y, z}; // already know
double pcoords[3] = {◯, △, ◇}; // already know
int ijk[3]; // I want know

int check = image->ComputeStructuredCoordinates(p, ijk, pcoords);
if (check == 1) {
    std::cout << "(" << ijk[0] << ", " << ijk[1] << ", " << ijk[2] << ")" <<
std::endl;
}

Is this right?

please help me!



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