vtk通过交互类改动已加载的actor中的数据（vtkpolyData）的实现的步骤

实际操作中我们经常会用到通过交互操作改变vtkactor的数据vtkpolydata，比如光滑物体某个三角网格，移动某一个线条，或者某一点，而保持其他的不变，简单来说就是在class  中实现对vtkpolydata的重新写入，再使得重新渲染。实现步骤整理如下：

class  callbacknew  :public vtkCommand

{public:
    static callbacknew *New()
    {
        return new callbacknew;
    }

void SetActor(vtkActor * mainActor)

{this->classActor=mainActor;

this->pd=vtkPolyData::SafeDownCast(mainActor->GetMapper()->GetInputAsDataSet());//或者通过建立public函数进行直接赋值也行

}

virtual void Execute(vtkObject *, unsigned long event, void *)

{    if（event == vtkCommand::LeftButtonPressEvent）{

//这里常用函数列出来

    vtkSmartPointerpts = vtkSmartPointer::New();

polyda->GetCellPoints(cellid, pts);//不推荐polyda->GetCellPoints(CellId, npt, pIds); 

double PointPos[3];

polyda->Getpoints（）->GetPoint(PointId, PointPos);//不推荐 double *pos= polyda->GetPoints->GetPoint(PointId);

polyda->Getpoints（）->SetPoint(PointId,a,b,c);

this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->RemoveActor(classActor);

mapper->Setinputdata(polyda);

classActor->Setmapper(mapper);

this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->AddActor(classActor);//先remove在add,不然无法更新actor；

this->interactor->Render();//不要忘了这个

}

}

private:

 vtkActor * classActor;

vtkPolyData * pd;

}

在主函数中callback->SetActor(mainActor);即可；