VTK工作原理的自我理解

#include "vtkActor.h"
#include "vtkFloatArray.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
#include "vtkRenderWindow.h"
#include "vtkDataSetMapper.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkProperty.h"
#include "vtkSimplePointsReader.h"
#include <iostream>

int main()
{       
        /*获取剧本，即通过映射器vtkMapper获取欲显示的数据*/
        vtkDataSetMapper *map = vtkDataSetMapper::New();     
        vtkSimplePointsReader *PointsReader = 
                vtkSimplePointsReader::New();
        PointsReader->SetFileName ("points.asc");
        map->SetInputConnection(PointsReader->GetOutputPort());

        /*将剧本拿给演员，即将映射器中的数据赋给演员vtkActor*/
        vtkActor *actor = vtkActor::New();       
        actor->SetMapper(map);
        actor->GetProperty()->SetPointSize(5);       
        actor->GetProperty()->SetColor(0,0,0);

        /*对演员进行化妆并布置场景，即通过渲染器vtkRenderer设置背景并处理演员*/
        vtkRenderer *ren = vtkRenderer::New();
        ren->SetBackground(1, 1, 1);
        ren->AddActor(actor);

        /*开拍，即将渲染的所有内容置于窗口vtkRenderWindow中*/
        vtkRenderWindow *win = vtkRenderWindow::New();       
        win->AddRenderer(ren);
        win->SetSize(400,400);

        /*放映，即通过窗口交互vtkRenderWindowInteractor显示欲显示的内容*/
        vtkRenderWindowInteractor *iren =   
                vtkRenderWindowInteractor::New();
        iren->SetRenderWindow(win);   
        iren->Initialize();
        iren->Start();

        /*收工，即释放内存*/
        actor->Delete();
        ren->Delete();
        win->Delete();
        iren->Delete();

        return 0;
}