基于vtkPolyData，绘制时除了输入点坐标，还需要通过setVerts指定点绘制信息。

simplePoints.txt的内容为简单的 xyz，如：

20 20 20

20 20 30

20 20 40

20 30 30

参考vtkSimplePointsReader，此类位于legacy文件夹下，不建议直接使用

// VTK includes

#include "vtkPoints.h"

#include "vtkPolyData.h"

#include "vtkActor.h"

#include "vtkRenderer.h"

#include "vtkRenderWindow.h"

#include "vtkPolyDataMapper.h"

#include "vtkInteractorStyle.h"

#include "vtkRenderWindowInteractor.h"

#include "vtkProperty.h"

#include "vtkCellArray.h"

#include "vtkInteractorStyleTrackballCamera.h"

int main(int argc, char *argv[])

{

vtkPoints *points = vtkPoints::New();

vtkCellArray *cells = vtkCellArray::New();

//ifstream fs(argv[1]);

ifstream fs("simplePoints.txt");

vtkIdType idtype;

double x, y, z;

while(fs>>x>>y>>z){

//插入点坐标，此处可改为其它的xyz

idtype = points->InsertNextPoint(x,y,z);

cells->InsertNextCell(1, &idtype);

}

// 渲染机制未知，需要同时设置点坐标与点坐标对应的verts

// verts中的id必须与点坐标对应

vtkPolyData *polyData = vtkPolyData::New();

polyData->SetPoints(points);

polyData->SetVerts(cells);

//下面为正常的可视化流程，可设置的点云颜色、大小等已注释

vtkPolyDataMapper *mapper = vtkPolyDataMapper::New();

mapper->SetInputData(polyData);

vtkActor *actor = vtkActor::New();

actor->SetMapper(mapper);

//设置颜色与点大小

//actor->GetProperty()->SetColor(0.0, 0.0, 0.0);

//actor->GetProperty()->SetPointSize(2);

vtkRenderer *renderer = vtkRenderer::New();

renderer->AddActor(actor);

// 设置背景颜色

// renderer->SetBackground(1, 1, 1);

vtkRenderWindow *renderWindow = vtkRenderWindow::New();

renderWindow->AddRenderer(renderer);

vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();

iren->SetRenderWindow(renderWindow);

vtkInteractorStyleTrackballCamera *style = vtkInteractorStyleTrackballCamera::New();

iren->SetInteractorStyle(style);

iren->Initialize();

iren->Start();

points->Delete();

polyData->Delete();

mapper->Delete();

actor->Delete();

renderer->Delete();

renderWindow->Delete();

iren->Delete();

style->Delete();

return 0;

}