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…
We define all edges in the boundary have no neighbor cells. It indicates that there is no boundary on the closed surface. In the following example, I read an STL file and get an arch. Step 1, clip the original Read more…
We can use XML to store the OpenCV matrix and read it to recover the whole image. A simple example is in the following code snippet. We write an original image data to Untitled1.xml, then read it to generate another Read more…
We can find that vtkOrientedGlyphContourRepresentation supports to set 3D model always above other objects. // Create the contour widget vtkSmartPointer<vtkContourWidget> contourWidget = vtkSmartPointer<vtkContourWidget>::New(); // Override the default representation for the contour widget to customize its look vtkSmartPointer<vtkOrientedGlyphContourRepresentation> contourRepresentation = vtkSmartPointer<vtkOrientedGlyphContourRepresentation>::New(); Read more…
We want to know the height of the above cone, there is the precondition that there is a red sphere in the center of the cone and we assume that we can’t get the height from multiplying the length of Read more…
The article shows a way to calculate the length between two points on a curve. We create a ring and put axis actor in the center to show the ring’s orientation and size. Here are implementation details, the data file Read more…