vtk如何输出.vtp格式的文件

1、vtkxmlpolydatawriter（）用来写入VTK XML polydata 格式的文件。vtkcellarray（）支持的列表结构形式：(n,id1,id2,…,idn, n,id1,id2,…,idn, …)其中n是在结构中点的数目，ID为偏移相关点列表。这种数据结构的优点：紧凑性，简单，易于外部数据的接口。然而，它是完全不足够的随机访问。

2、代码如下#include "vtkVersion.h"#include "vtkSmartPointer.h"#include "vtkPolyData.h"#include "vtkPoints.h"#include "vtkCellArray.h"#include "vtkXMLPolyDataWriter.h"#include <vtkVertexGlyphFilter.h>#include <vtkPolyDataMapper.h>#include <vtkActor.h>#include <vtkRenderer.h>#include <vtkRenderWindow.h>#include <vtkRenderWindowInteractor.h>#include <iostream>vtkPolyData * custom_reader(std::istream & infile){ vtkIdType number_of_points, number_of_triangles; infile >> number_of_points >> number_of_triangles; vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New(); points->SetNumberOfPoints(number_of_points); for (vtkIdType i = 0; i < number_of_points; i++) { double x, y, z; infile >> x >> y >> z; points->SetPoint(i, x, y, z); } vtkSmartPointer<vtkCellArray> polys = vtkSmartPointer<vtkCellArray>::New(); for (vtkIdType i = 0; i < number_of_triangles; i++) { vtkIdType a, b, c; infile >> a >> b >> c; polys->InsertNextCell(3); polys->InsertCellPoint(a); polys->InsertCellPoint(b); polys->InsertCellPoint(c); } vtkPolyData * polyData = vtkPolyData::New(); polyData->SetPoints(points); polyData->SetPolys(polys); return polyData;}int main(){ std::string inputFilename = "888.txt"; std::ifstream fin(inputFilename.c_str()); vtkSmartPointer<vtkPolyData> polyData = vtkSmartPointer<vtkPolyData>::Take( custom_reader(fin)); 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); vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); renderer->AddActor(actor); renderer->SetBackground(.3, .6, .4); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); renderWindow->Render(); renderWindowInteractor->Start(); vtkSmartPointer<vtkXMLPolyDataWriter> writer = vtkSmartPointer<vtkXMLPolyDataWriter>::New(); writer->SetInput(polyData); writer->SetFileName("888.vtp"); writer->Write(); return 0;}