I have two old posts about draw display bounding box, VTK: Show Display Bounds After Project Points and VTK: Show Display Bounds. But they didn’t give me a statisfy result.In this post, I find feature edges of the mesh firstly, convert the world points to display points by vtkViewport object. Read more…
Here are a few points like the following picture. The source code: #include <iostream> #include <vector> #include <iostream> #include <vtkPolyData.h> #include <vtkProperty.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkPlane.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkPoints.h> #include <vtkInteractorStyleTrackballCamera.h> #include “./point.hpp” #include <vtkPlane.h> #include <vtkPlaneSource.h> #include <vtkTransform.h> #define vtkSPtr vtkSmartPointer #define Read more…
Here is a 3D object lock from Create Lock By Blender. We can use vtkPolyDataSilhouette to extract a subset of a polygonal mesh edges to generate an outline (silhouette). #include <iostream> #include <vector> #include <iostream> #include <vtkPolyData.h> #include <vtkProperty.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkPlane.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include Read more…
The post shows a way to scale image which is displayed by vtkActor2D object. We used vtkImageResize that performs sinc interpolation on images to change their sizes. #include <vtkCamera.h> #include <vtkImageActor.h> #include <vtkImageCanvasSource2D.h> #include <vtkImageData.h> #include <vtkImageMapper3D.h> #include <vtkImageReader2.h> #include <vtkImageReader2Factory.h> #include <vtkImageResize.h> #include <vtkImageSincInterpolator.h> #include <vtkInteractorStyleImage.h> #include <vtkNamedColors.h> #include Read more…
The post is similar to Find Closest Plane Between Points In 3D By Levmar Algorithm. The vtkPlane in vtk9.0.2 or the newer version provides a way to calculate the fitting plane for a few points. static bool ComputeBestFittingPlane(vtkPoints* pts, double* origin, double* normal);. The origin will be the centroid of Read more…
We know the matrix shearing object along a particular axis looks like: The shear transform can help us to approve that when a normal vector is transformed using the same matrix that transforms the points on an object, the resulting vector may not be perpendicular to the surface Read more…
Here are three vectors (1, 0, 1), (-1, 0, 1) and (0, -1, 0) in the 3D world space. Define a position pos(1, 1, 0). These vector and position forms a new coordinate system A. The inverse result is status B. The original world coordinate system can be changed to Read more…
Here are four points in 3D space, we will take them and generate another four points to draw a cube. Construct triangles to form cells for the mesh, the normal of every cell is toward inside. Here are all details about the generation. Update on 2023.10.17: The cells’ normals generated Read more…
The post is based on https://www.weiy.city/2021/11/vtk-rotate-vector-to-special-direction/. We will rotate the three axes of the world coordinate system to particular directions. #include <iostream> #include <vtkSmartPointer.h> #include <vtkTransform.h> #include <vtkActor.h> #include <vtkConeSource.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkPolyDataMapper.h> #include <vtkRenderWindowInteractor.h> #include <vtkAxesActor.h> #include “../point.hpp” using namespace std; double AngleBeteewnTwoVector( Point vec0, Point Read more…