{{{#!c++
// VTK Structured Grid Sample
//
// Created on Sun Mar 23 11:17:34 2014
//
//
#include <iostream>
#include <fstream>
#include <vtkXMLStructuredGridWriter.h>
#include <vtkStructuredGrid.h>
#include <vtkDataSet.h>
#include <vtkPointData.h>
#include <vtkCellData.h>
#include <vtkCellArray.h>
#include <vtkDoubleArray.h>

int main(int argc, char **argv) {
	// Declare "ifsteam" class object
	ifstream ifile;

	// Open a file with read-mode (default) "open" is a member function of "ifstream"
	ifile.open("officeFlow.txt");
	// Check if file exists
	if (ifile.fail()) {
		std::cout << "file not found" << endl;
		return 0;
	}

	// Reading data from the file. ">>" is a operator of "ifstream"
	int nx, ny, nz;
	ifile >> nx >> ny >> nz;

	// setup VTK
	vtkXMLStructuredGridWriter *writer = vtkXMLStructuredGridWriter::New();
	vtkStructuredGrid *structured_grid = vtkStructuredGrid::New();
	structured_grid->SetDimensions(nx, ny, nz);
	vtkPoints *nodes = vtkPoints::New();
	nodes->Allocate(nx * ny * nz);
	vtkDoubleArray* prsArray = vtkDoubleArray::New();
	prsArray->SetNumberOfComponents(1);
	prsArray->SetName("Pressure");
	vtkDoubleArray* velArray = vtkDoubleArray::New();
	velArray->SetNumberOfComponents(3);
	velArray->SetName("Velocity");

	for (int k = 0; k < nz; k++) {
		for (int j = 0; j < ny; j++) {
			for (int i = 0; i < nx; i++) {
				double x, y, z, u, v, w, p;
				ifile >> x >> y >> z >> u >> v >> w >> p;

				nodes->InsertNextPoint(x, y, z);
				prsArray->InsertNextTuple(&p);
				velArray->InsertNextTuple3(u, v, w);
			}
		}
	}
	// close file
	ifile.close();

	structured_grid->SetPoints(nodes);
	structured_grid->GetPointData()->AddArray(velArray);
	structured_grid->GetPointData()->AddArray(prsArray);

#if (VTK_MAJOR_VERSION >=6)
	writer->SetInputData(structured_grid);
#else
	writer->SetInput(structured_grid);
#endif

	writer->SetFileName("officeFlow.vts");
	writer->SetDataModeToAscii();
	writer->Write();

	structured_grid->Delete();
	writer->Delete();
	nodes->Delete();
	velArray->Delete();
	prsArray->Delete();
}
}}}

Compile
{{{#!bash
$ cmake .
$ make
}}}