The article is based on How to use the OpenCV parallel_for_ to parallelize your code, the example project uses OpenCV parallel_for_ to speed up the computing process. Now I plan to use the algorithm class vtkSMPTools in VTK to get the same positive effect. The unit computing task is put Read more…
Development environment: VTK-8.1.1 macOS Catalina 10.15 Python 2.7.10 Configure variables about Qt in CMake GUi fristly. Some details are in the following script file configure.sh. cmake ./ -G “Unix Makefiles” \ -DVTK_USE_QVTK:BOOL=ON \ -DCMAKE_INSTALL_PREFIX=/usr/local \ -DVTK_USE_GUISUPPORT:BOOL=ON \ -DVTK_QT_VERSION=5 \ -DModule_vtkGUISupportQt:BOOL=ON \ -DModule_vtkGUISupportQtOpenGL:BOOL=ON \ -DModule_vtkGUISupportQtSQL:BOOL=ON \ -DModule_vtkGUISupportQtWebkit:BOOL=OFF \ -DModule_vtkRenderingQt:BOOL=ON \ -DModule_vtkViewsQt:BOOL=ON Read more…
I write a small project to create a curve that can be changed and export. The class vtkContourWidget is used to re-construct the curve, vtkXMLPolyDataWriter object helps us to store the polydata. All details for the project had been pushed to GitHub, link: CreateCurve If you fork the repository and Read more…
Store Polydata Some Special polydata can’t be stored by vtkSTLWriter. The following polydata contains points and a line in its structure, it can’t be saved by vtkSTLWriter, but vtkXMLPolyDataWriter works. vtkObject::GlobalWarningDisplayOn(); int numPts = 10; vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New(); int offset = numPts / 4; for (int i = 0; Read more…
What does the vtkImageData look like? It has a multi-layered point set. In the following example, I show all points in a vtkImageData object in the left reader and its polydata in the right render. #define vtkSPtr vtkSmartPointer #define vtkSPtrNew(Var, Type) vtkSPtr<Type> Var = vtkSPtr<Type>::New(); unsigned char inval = 255; Read more…
I write the reason why concatenate transform and its inversed transform for offTrans in scale operation based on the article Rotate, Translate And Scale For Camera vtkSPtrNew( scaleTrans, vtkTransform ); scaleTrans->Scale( factor, factor, 1 ); scaleTrans->Update(); vtkSPtrNew( offTrans, vtkTransform ); offTrans->Concatenate( worldTrans ); offTrans->Concatenate( scaleTrans ); offTrans->Concatenate( worldInversedTrans ); offTrans->Update(); Read more…
We know that there are three ways to adjust 3D model, rotate, translate and scale. If these transforms act on camera, we will see the model stand still. The status of camera in vtk can be defined by focal point, position and viewUp, so we can change these parameters to Read more…
We create a cone and a sphere individually, then combine the cone and the sphere, show it in the middle renderer. #define vtkSPtr vtkSmartPointer #define vtkSPtrNew(Var, Type) vtkSPtr<Type> Var = vtkSPtr<Type>::New(); unsigned char inval = 255; unsigned char outval = 0; double spacingVal = 0.5; vtkSPtr<vtkImageData> ConvertPolydataToImage(vtkPolyData *polydata) { double Read more…
convert polydata to image data #include <vtkVersion.h> #include <vtkImageData.h> #include <vtkImageMapper3D.h> #include <vtkImageStencil.h> #include <vtkImageStencilData.h> #include <vtkImageToImageStencil.h> #include <vtkJPEGReader.h> #include <vtkPointData.h> #include <vtkSmartPointer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkInteractorStyleImage.h> #include <vtkRenderer.h> #include <vtkImageActor.h> #include <vtkPolyDataToImageStencil.h> #include <vtkPolyData.h> #include <vtkSTLReader.h> #include <vtkImageProperty.h> #include <vtkSphereSource.h> #define vSP vtkSmartPointer #define vSPNew(Var, Type) vSP<Type> Read more…