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…
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…
std::unique_copy is an algorithm which can be used to copy elements without duplicating objects in adjacent locations. template< class InputIt, class OutputIt > OutputIt uniquecopy( InputIt first, InputIt last, OutputIt dfirst ); Usage example: C++ #include #include #include #include int main() { std::string s1 = “This is a story about Read more…
We want to know the world coordinate of a point on a 3D widget event though we don’t know the widget’s position on the world coordinate system. I get a matrix from an actor and create a temporal vtkTransform object, then the function TransformDoublePoint can give me the real coordinate Read more…
I often use the function AddInputData or AddInputConnection of vtkAppendPolydata that inherits vtkDataObjectAlgorithm to add multiple polydatas form a big one. That’s a very easy way to combine a few of different polydatas to only one. But I found that it can give me a strange result if I use Read more…
The introduction of Just-in-Time (JIT) debugger tool drmingw： https://vroby.ddns.net/Public/sdlBasic/MinGW/doc/drmingw/drmingw.html It’s very easy to install this tool. We can download from the internet and unzip it: It’s necessary to put the directory of the tool bin in the environment variable Path on windows OS. After that, we can run drmingw.exe by Read more…