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 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> 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 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> 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 Read more…
There are three examples using views displaying relations of vtk classes. The article learned from VTKUsersGuide vtkTreeRingView Python #!/usr/bin/env python from vtk import * def main(): datapath = “/Users/weiyang/Downloads/VTKData” #vtk.util.misc.vtkGetDataRoot() reader1 = vtkXMLTreeReader() reader1.SetFileName(datapath + “/Data/Infovis/XML/vtkclasses.xml”) reader1.SetEdgePedigreeIdArrayName(“tree edge”) reader1.GenerateVertexPedigreeIdsOff(); reader1.SetVertexPedigreeIdArrayName(“id”); Read more…
Two ways to add data object for a vtkView. 1) Create a representation object, set the inputs for it by calling SetInputConnection() or SetInput(), then add representation for the view. 2) Use AddRepresentationFromInputConnection or AddRepresentationFromInput to create representation automatically. 1) 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, 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 Read more…