I upgrade my server OS to CentOS 8.1, besides that the PHP, WordPress, and apache had been also upgraded to the latest version. All data had been back up by plugin UpdraftPlus, I planned to use it to restore my website. Here are some problems I met when I restored Read more…
To find a high-quality book on amazon kindle store, I collect some books information and analyze them. The process can be divided into two main parts. Part 1. Download books’ information and save them to the database. We use BeautifulSoup to collect all books’ divs on the web page, convert Read more…
单纯看“Can’t follow edge”的错误提示，我没能得到有价值的线索。不管怎么说，在使用该对象处理数据之前居然需要写读一遍信息本身就显得很诡异，或者，这就是VTK8.2上的一个bug？也许，当我升级VTK之后才能找到答案。
The article introduces how to expand the sampling area from a cell. I marked the area red color, the center point is computed as the mass center of the original cell. Step 1, find all cells which are near to the center point within a distance. We can use the Read more…
I wanted to find the area in the black circle on the tooth surface, so the algorithm class vtkSelectPolyData was used in my project. The idealized result looks like the following picture. Unfortunately, I got the bad region as this scene. After reading the source code about vtkSelectPolyData, I found Read more…
We create a simple scene for the first time, cone and axes are in the point (0, 0, 0). #include <iostream> #include <vtkSmartPointer.h> #include <vtkSphereSource.h> #include <vtkActor.h> #include <vtkConeSource.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkPolyDataMapper.h> #include <vtkLineSource.h> #include <vtkRenderWindowInteractor.h> #include <vtkAxesActor.h> #include <vtkProperty.h> #include <vtkXMLPolyDataReader.h> #include <vtkCharArray.h> #include <vtkPointData.h> #include Read more…
This post introduces a way to find the biggest plane on the 3D model. We expand the initial cell by comparing its normal with neighbor’s normal. It indicates they are on a plane if the two normals of cells are approximately equal. I use vtkOBBTree to find the min axes Read more…
Step function The step function is simple, it gets only two values zero or one no matter what the input value is. #!/usr/bin/env python import numpy as np import matplotlib.pylab as plt def step_function(x): return np.array(x>0, dtype=np.int) if __name__ == ‘__main__’: x = np.arange( -5, 5, 0.1 ) y = Read more…
Creating Factory We often make_shared to create a shared pointer in std. It’s safe and easy for the developer to use. The using examples are in the following code snippet. shared_ptr<Base> ptr = make_shared<Base>(); auto p = make_shared<int>(100); cout << *p << endl; Delete Function Create a delete function for Read more…