VTK Spline 样条曲线

vtkKochanekSpline：根据点集的顺序就能连接得到平滑曲线 

vtkNew<vtkNamedColors> colors;

  int numberOfPoints = 10;
  vtkNew<vtkPointSource> pointSource;
  pointSource->SetNumberOfPoints(numberOfPoints);
  pointSource->Update();

  vtkPoints* points = pointSource->GetOutput()->GetPoints();

  vtkNew<vtkKochanekSpline> xSpline;
  vtkNew<vtkKochanekSpline> ySpline;
  vtkNew<vtkKochanekSpline> zSpline;  

  vtkNew<vtkParametricSpline> spline;
  spline->SetXSpline(xSpline);
  spline->SetYSpline(ySpline);
  spline->SetZSpline(zSpline);
  spline->SetPoints(points);

  vtkNew<vtkParametricFunctionSource> functionSource;
  functionSource->SetParametricFunction(spline);
  functionSource->SetUResolution(50 * numberOfPoints);
  functionSource->SetVResolution(50 * numberOfPoints);
  functionSource->SetWResolution(50 * numberOfPoints);
  functionSource->Update();

  // Setup actor and mapper
  vtkNew<vtkPolyDataMapper> mapper;
  mapper->SetInputConnection(functionSource->GetOutputPort());

  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);
  actor->GetProperty()->SetColor(colors->GetColor3d("DarkSlateGrey").GetData());
  actor->GetProperty()->SetLineWidth(3.0);

SplineWidget

 

#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSplineWidget2.h>

int main(int, char*[])
{
  vtkNew<vtkNamedColors> colors;

  // A renderer and render window
  vtkNew<vtkRenderer> renderer;
  renderer->SetBackground(colors->GetColor3d("MidnightBlue").GetData());

  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("SplineWidget");

  // An interactor
  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  vtkNew<vtkSplineWidget2> splineWidget;
  splineWidget->SetInteractor(renderWindowInteractor);

  renderWindowInteractor->Initialize();
  renderWindow->Render();
  splineWidget->On();
  renderer->ResetCamera();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

 SCurveSpline 需要用直线连接点集合的话，vtkSCurveSpline 合适

 

#include <vtkNew.h>
#include <vtkPointSource.h>
#include <vtkPoints.h>
#include <vtkSCurveSpline.h>
#include <vtkParametricSpline.h>
#include <vtkParametricFunctionSource.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkProperty.h>


int main(int, char *[])
{
  vtkNew<vtkNamedColors> colors;

  vtkNew<vtkPointSource> pointSource;
  pointSource->SetNumberOfPoints(5);
  pointSource->Update();

  vtkPoints* points = pointSource->GetOutput()->GetPoints();

  vtkNew<vtkSCurveSpline> xSpline;
  vtkNew<vtkSCurveSpline> ySpline;
  vtkNew<vtkSCurveSpline> zSpline;

  vtkNew<vtkParametricSpline> spline;
  spline->SetXSpline(xSpline);
  spline->SetYSpline(ySpline);
  spline->SetZSpline(zSpline);
  spline->SetPoints(points);

  vtkNew<vtkParametricFunctionSource> functionSource;
  functionSource->SetParametricFunction(spline);
  functionSource->Update();

  // Setup actor and mapper
  vtkNew<vtkPolyDataMapper> mapper;
  mapper->SetInputConnection(functionSource->GetOutputPort());

  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);
  actor->GetProperty()->SetColor(colors->GetColor3d("Tomato").GetData());

  // Setup render window, renderer, and interactor
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("SCurveSpline");

  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);
  renderer->AddActor(actor);
  renderer->SetBackground(colors->GetColor3d("DarkSlateGray").GetData());

  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

TubesFromSplines

根据几个点插值成样条曲线，然后以样条曲线为中心线，生成圆柱体管道

 

#include "vtkActor.h"
#include "vtkCamera.h"
#include "vtkCellArray.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"
#include "vtkPolyDataMapper.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h" 
#include "vtkProperty.h"
#include "vtkTubeFilter.h"
#include "vtkParametricSpline.h"
#include "vtkParametricFunctionSource.h"
int main()
{
  vtkPoints *points = vtkPoints::New();

  points->InsertPoint(0, 0.0, 0.0, 0.0);
  points->InsertPoint(1, 1.0, 1.0, 1.0);
  points->InsertPoint(2, 1.0, 0.0, 0.0);
  points->InsertPoint(3, 1.0, 0.0, 1.0);

  //
  //插值为样条曲线
  vtkParametricSpline *spline = vtkParametricSpline::New();
  spline->SetPoints(points);
  spline->ClosedOff();
  vtkParametricFunctionSource *splineSource = vtkParametricFunctionSource::New();
  splineSource->SetParametricFunction(spline);
  splineSource->Update();

  vtkPolyDataMapper *splineMapper = vtkPolyDataMapper::New();
  splineMapper->SetInputConnection(splineSource->GetOutputPort());
  splineMapper->Update();
  vtkActor *splineActor = vtkActor::New();
  splineActor->SetMapper(splineMapper);
  splineActor->GetProperty()->SetColor(0.3800, 0.7000, 0.1600);

  //    

  vtkTubeFilter *tube = vtkTubeFilter::New();
  tube->SetInputData(splineSource->GetOutput());
  tube->SetNumberOfSides(20);
  tube->SetRadius(0.05);
  tube->Update();

  vtkPolyDataMapper *tubeMapper = vtkPolyDataMapper::New();
  tubeMapper->SetInputData(tube->GetOutput());

  vtkActor *tubeActor = vtkActor::New();
  tubeActor->SetMapper(tubeMapper);

  vtkRenderer *ren1 = vtkRenderer::New();
  vtkRenderWindow *renWin = vtkRenderWindow::New();
  renWin->AddRenderer(ren1);
  vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
  iren->SetRenderWindow(renWin);

  ren1->AddActor(splineActor);
  ren1->AddActor(tubeActor);

  ren1->SetBackground(1, 1, 1);
  renWin->SetSize(250, 250);
  renWin->Render();

  iren->Start();
  return 0;
}