vtkReverseSense can help us to reverse the direction of point normals and cell normals. The following code shows a simple example which display vertexes’ normals by cones in a sphere. Here is its original geometric states. #include <iostream> #include <vtkSmartPointer.h> #include <vtkSphereSource.h> #include <vtkActor.h> #include <vtkConeSource.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> Read more…
Development environment: VTK-8.1.1 macOS 10.14.4 Qt 5.11.2 Clang 8.1.0 package for vtk program use otool command tool to find all depent library files for executable. otool -L exe Then we can redirect all output logs into a local file and make it as a shell script file. Rewrite it and Read more…
The article shows how to use vtkViewUpdater to update different views when the selections changed. Relevant development environment: VTK-8.1.1; Qt 5.11.2 (x86_64-little_endian-lp64 shared (dynamic) release build; Clang 8.1.0 (clang-802.0.42) (Apple)) on “cocoa”; macOS 10.14 [darwin version 18.5.0]; #include <QApplication> #include <qsurfaceformat.h> #include <QVTKOpenGLWidget.h> #include <vtkRandomGraphSource.h> #include <vtkDataObjectToTable.h> #include <vtkQtTableView.h> #include Read more…
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…
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…