vtk实战(十一)—自定义分隔符读取文本

本例读取坐标和法向量的纯文本文件（X、Y、Z、 NX、NY、NZ）并显示在屏幕上。本例主要用到的类：

vtkDelimitedTextReader（）

该类自定义分隔符，分割ASCII或Unicode文本文件。

#include <vtkVersion.h>#include <vtkSmartPointer.h>#include <vtkProperty.h>#include <vtkPolyDataMapper.h>#include <vtkActor.h>#include <vtkDelimitedTextReader.h>#include <vtkDoubleArray.h>#include <vtkTable.h>#include <vtkPointData.h>#include <vtkRenderWindow.h>#include <vtkRenderWindowInteractor.h>#include <vtkRenderer.h>#include <vtkVertexGlyphFilter.h>int main(){    std::string inputFilename = "example.txt";    vtkSmartPointer<vtkDelimitedTextReader> reader =        vtkSmartPointer<vtkDelimitedTextReader>::New();    reader->SetFileName(inputFilename.c_str());    reader->DetectNumericColumnsOn();    reader->SetFieldDelimiterCharacters(" ");    reader->Update();    vtkTable* table = reader->GetOutput();    vtkSmartPointer<vtkPoints> points =        vtkSmartPointer<vtkPoints>::New();    vtkSmartPointer<vtkDoubleArray> normals =        vtkSmartPointer<vtkDoubleArray>::New();    normals->SetNumberOfComponents(3); //3d normals (ie x,y,z)    std::cout << "Table has " << table->GetNumberOfRows()        << " rows." << std::endl;    std::cout << "Table has " << table->GetNumberOfColumns()        << " columns." << std::endl;    for (vtkIdType i = 0; i < table->GetNumberOfRows(); i++)    {        std::cout << "x: " << (table->GetValue(i, 0)).ToDouble()            << " y: " << (table->GetValue(i, 1)).ToDouble()            << " z: " << (table->GetValue(i, 2)).ToDouble();        points->InsertNextPoint((table->GetValue(i, 0)).ToDouble(),            (table->GetValue(i, 1)).ToDouble(),            (table->GetValue(i, 2)).ToDouble());        double n[3];        n[0] = (table->GetValue(i, 3)).ToDouble();        n[1] = (table->GetValue(i, 4)).ToDouble();        n[2] = (table->GetValue(i, 5)).ToDouble();        std::cout << " n: " << n[0] << " " << n[1] << " " << n[2] << std::endl;        normals->InsertNextTuple(n);    }    std::cout << "There are " << points->GetNumberOfPoints()        << " points." << std::endl;    vtkSmartPointer<vtkPolyData> polydata =        vtkSmartPointer<vtkPolyData>::New();    polydata->SetPoints(points);    polydata->GetPointData()->SetNormals(normals);    vtkSmartPointer<vtkVertexGlyphFilter> glyphFilter =        vtkSmartPointer<vtkVertexGlyphFilter>::New();    glyphFilter->SetInputConnection(polydata->GetProducerPort());    glyphFilter->Update();    vtkSmartPointer<vtkPolyDataMapper> mapper =        vtkSmartPointer<vtkPolyDataMapper>::New();    mapper->SetInputConnection(glyphFilter->GetOutputPort());    vtkSmartPointer<vtkActor> actor =        vtkSmartPointer<vtkActor>::New();    actor->SetMapper(mapper);    actor->GetProperty()->SetPointSize(3);    actor->GetProperty()->SetColor(1, 0, 0);    vtkSmartPointer<vtkRenderer> renderer =        vtkSmartPointer<vtkRenderer>::New();    vtkSmartPointer<vtkRenderWindow> renderWindow =        vtkSmartPointer<vtkRenderWindow>::New();    renderWindow->AddRenderer(renderer);    vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =        vtkSmartPointer<vtkRenderWindowInteractor>::New();    renderWindowInteractor->SetRenderWindow(renderWindow);    renderer->AddActor(actor);    renderer->SetBackground(.3, .6, .3); // Background color green    renderWindow->Render();    renderWindowInteractor->Start();    return 0;}

程序运行结果：

程序代码：http://pan.baidu.com/s/1chutp8