I wanted to explore vtkPlaneSource’s interfaces SetPoint1 and SetPoint2 with visible 3D Axes. It’s awkward to find that it’s difficult to control plane’s shape by interfaces SetPoint1 and SetPoint2 directly. So I used vtkAxesActor to show three axes in the world coordinate system. #include <iostream> #include <vtkSmartPointer.h> #include <vtkSphereSource.h> #include Read more…
The algorithm copy_if is useful, it can help us to get all elements that meet special conditions. C++ template OutputIt copy_if( InputIt first, InputIt last, OutputIt d_first, UnaryPredicate pred ); Possible implement: C++ template OutputIt copy_if(InputIt first, InputIt last, OutputIt d_first, UnaryPredicate pred) { while (first != last) { if Read more…
Print debug info by vtk macro How to show vtk object’s debug information? I introduce how to show vtk object’s debug information by the custom class which inherits vtkPolyDataAlgorithm, relevant article: 【VTK】Create source class which is derived from vtkPolyDataAlgorithm We just need to Star->DebugOn() and use vtkDebugMacro as std::cout. vtkDebugMacro( Read more…
What’s the difference between deep copy and shallow copy in vtkPolyData? We can find an answer after reading the two interface’s implementation. ShallowCopy just changes the pointer pointing, two vtkPolydata objects share the individual elements. DeepCopy makes the current polydata have own points and cells, it copies every element. void Read more…
How to decimate a PolyData without changing pointData’s scalar’s position? Two classes vtkQuadricDecimation and vtkDecimatePro are worth discussing. vtkQuadricDecimation can decimate pointdata’s scalar. We have to set AttributeErrorMetric true to handle it. #include <iostream> #include <vtkSmartPointer.h> #include <vtkSphereSource.h> #include <vtkActor.h> #include <vtkConeSource.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkPolyDataMapper.h> #include <vtkProperty.h> Read more…
The article shows how to create a subclass which inherits vtkPolyDataAlgorithm and use it in vtk pipeline mechanism. We create a star source object which is like vtkSphereSource and display it by a vtkActor object. The star source class is very simple, it has just five points and five lines. Read more…
Create a simple cone and plane. #include <iostream> #include <vtkSmartPointer.h> #include <vtkSphereSource.h> #include <vtkActor.h> #include <vtkConeSource.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkPolyDataMapper.h> #include <vtkProperty.h> #include <vtkRenderWindowInteractor.h> #include <vtkLight.h> #include <vtkCamera.h> #include <vtkOBBTree.h> #include <vtkActor2D.h> #include <vtkMath.h> #include <vtkTransform.h> #include <vtkTransformFilter.h> #include <vtkMatrix4x4.h> #include <vtkInteractorObserver.h> #include <vtkPolyDataNormals.h> #include <vtkOutlineFilter.h> #include <vtkPlaneSource.h> Read more…
I will show how to use vtkOBBTree to calculate X, Y and Z axis of the 3D model in the article. Create a simple cone. #include <iostream> #include <vtkSmartPointer.h> #include <vtkSphereSource.h> #include <vtkActor.h> #include <vtkConeSource.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkPolyDataMapper.h> #include <vtkProperty.h> #include <vtkRenderWindowInteractor.h> #include <vtkLight.h> #include <vtkCamera.h> #include Read more…
STL Algorithm std::lexicographical_compare is an algorithm which can be used to compare string lexicographically.We can give our comparing function to make it work without pay attention to capital and small letter. C++ template constexpr bool lexicographical_compare( InputIt1 first1, InputIt1 last1, InputIt2 first2, InputIt2 last2, Compare comp ); Example: C++ #include Read more…