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 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 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 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__ == 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 << Read more…
C++11 supports the flexible parameter list by template technology, it can help us to define a powerful function. The article introduces how to create a log output function which looks like the following scene. Log( IDebug, “one: “, 1, “, Read more…
The article introduces how to collect Chinese idioms on the Internet by python. I chose a website that contains many Chinese idioms, http://cy.5156edu.com , to do the experiments. We have to make sure the library BeautifulSoup installed for Python firstly, Read more…
The article introduces two ways to calculate the distance from a point to a line. One use dot product by two vectors to get distance vector, and the other use cross product by vectors to achieve it. Let’s assume the Read more…
We can use vtkImplicitPolyDataDistance to calculate the distance from a point to the target polydata. It’s better than calculating the distance by iterating to the search point. The following example puts a sphere that radius is 1 and origin is Read more…