VTK

Sometimes the 3D model and 2D object will be overlapped as the above scene. I want to move the text to the top for avoiding overlap situation. My solution has these steps: 1. Calculate the bounding box of the sphere and convert it to a rectangle which wraps the image Read more…

We can put model in VTK display coordinate system. The following example is based on a previous article: Show Special Character In VTK . I add a line which start from (0,0) to left bottom corner of red string, the line is represented as 2D model. int *size = renderer->GetSize(); Read more…

We can use vtkTextActor to show string which contains special character. I use encoding value to represent math symbol and store it in QString object in the following example. #include <vtkActor.h> #include <vtkPolyData.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkSmartPointer.h> #include <vtkTextActor.h> #include <vtkSphereSource.h> #include <vtkPlaneSource.h> #include <vtkPolyDataMapper.h> #include Read more…

After upgrade vtk from 7.1.0 to 8.2.0, the old project shows a warning window about VTKWidget. The newest vtk-qt program suggest me not to use old QVTKWidget anymore, so I rewrite my qt UI file I have qt UI file as the following code snippet, a few widgets are put Read more…

Draw The Plane Manually We can create a big plane if we know its origin and normal. The algorithm class vtkPlaneSource is a solution for it, but the generated plane is too small, it’s hard to create a big plane based on vtkPlaneSource, so I wrote a function for the Read more…

They are many different cells in VTK, they can be divided into two kinds, linear cells, and non-linear cells. The following images are from VTKUsersGuide. Linear Cells Non-Linear Cells Although vtkUnstructuredGrid and vtkPolyData are similar, there are substantial differences. vtkPolyData can only represent cells of topological dimension 2 or less Read more…

Here is relevant introduction about vtkImageData from VTKUsersGuide. A vtkImageData dataset is defined by data dimensions, interpoint spacing, and the origin (i.e., lower-left corner) of the dataset. If the dimension of the dataset is two, then we call the vtkImageData dataset an image, and it is composed of vtkPixel cell Read more…