VTK

The article shows a way to enlarge a plane and keep its original position, scale it and translate it back. #include <iostream> #include <vtkSmartPointer.h> #include <vtkProperty.h> #include <vtkPolyData.h> #include <vtkTriangleFilter.h> #include <vtkRegularPolygonSource.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> #include <vtkInteractorStyleTrackballCamera.h> #include <vtkCamera.h> #include <vtkNamedColors.h> #include <vtkImageActor.h> Read more…

The following code comes from vtkFollower, we used it to make the original axes always face the camera. #include <iostream> #include <vtkSmartPointer.h> #include <vtkProperty.h> #include <vtkPolyData.h> #include <vtkTriangleFilter.h> #include <vtkRegularPolygonSource.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> #include <vtkInteractorStyleTrackballCamera.h> #include <vtkCamera.h> #include <vtkNamedColors.h> #include <vtkImageActor.h> #include <vtkImageViewer2.h> Read more…

The algorithm vtkOBBTree::ComputeOBB can help us to calculate the three axes defining the orientation of the OBB(oriented bounding box). It is very useful for us to get the model’s spatial features. #include <iostream> #include <vtkSmartPointer.h> #include <vtkSphereSource.h> #include <vtkActor.h> #include <vtkConeSource.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkPolyDataMapper.h> #include <vtkProperty.h> #include Read more…

Use Transform We have both points on the image, the distance weight on the x-axis between the two points is 1. What is the distance weight on the vector (p1−p2) between the two points? It’s easy to calculate the result because we know Pythagorean theorem and the special direction is Read more…

I don’t know the difference between center and origin in vtkPlane when I use it in my project for the first time. I thought the center of the plane is its origin until today, it’s the reason why I could not get a correct rectangle when I tried to set Read more…

The vtkCamera object has a front clipping plane and back clipping plane. Users can only see the middle part between the clipping planes. So we can change the clipping plane's position, clipping range, to get a different 3D scene. The relevant variable in VTK is double vtkCamera: ClippingRange[2];. When we Read more…

The algorithm class vtkPolyDataNormals can be used to calculate normals of points and cells in polydata. The following example shows how to use it. Cube Create a cube in which every cell is a single square. All information can be found in polydata, we use vtkPolyDataNormals to handle it and Read more…