We can use vtkCoordinate and vtkRenderer objects to convert point’s coordinate from a system to another one. I found vtkCoordinate called the functions of vtkViewport (vtkRenderer is child class of vtkViewport) to accomplish coordinate transformation. class vtkViewport: virtual void LocalDisplayToDisplay(double Read more…
The article introduces a way to reduce the size of the gif file. The python script analysis gif file and generate many png files from multiple frames. Then it takes a few png files to combine a new smaller gif Read more…
I want to combine all png files to a single PDF file. The following python script can make this task simpler. If you want to use the script, please make sure python can be installed and folder path and pdf Read more…
I want to show png picture by vtkActor2D rather than vtkImageActor or vtkImageViewer. There is not rotating and scaling for the picture when move mouse and click if the vtkActor2D object works. But how to do it? The following project Read more…
I want to fill the image to become a square one. The interface copyMakeBorder can help us to expand the original image to a bigger size. /* @param top @param bottom @param left @param right Parameter specifying how many pixels Read more…
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 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 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 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 Read more…