We often use vtkPropPicker to judge which 2D actor had been picked, but the solution doesn’t work in the Mac software Parallels. So we have to create a new method to found the 2D actor which had been picked. There are two situations in my problem. The actor2D takes vtkImageMapper Read more…
We have a vtkTextActor object in the render window now. How to put it at the right-top corner or the left-bottom corner in the render window according to the render and text rectangle’s size? The following code snippet shows the different scenes described above. #include <iostream> #include <vtkSmartPointer.h> #include <vtkSphereSource.h> Read more…
We will got the following left part’s effect when zoom in and zoom out in VTK render window. How to keep the same display size for the 3D model cube when zoom in or zoom out? VTK changes camera’s status in the interfaces vtkInteractorStyleTrackballCamera::OnMouseWheelForward and vtkInteractorStyleTrackballCamera::OnMouseWheelBackward, the action Dolly moves Read more…
The inital scene is like the following image, here are an axes actor and an irregular 3D model. We want to find all points that are on the model and face the plane which has normal (0, 1, 0) and origin (0, -10, 0). My solution spend a lot time, Read more…
I want to find the inner polydata which are surrounded by six planes in the above image. So the intersect point of the three planes that intersect is important. How to find the intersect point of the three planes? We know the mathematical expression for a plane has the following Read more…
The article shows a way to find the bounding shell of the 3D model in its local coordinate system. Let’s create a cone and an axes actor which displays three axes in the world coordinate system. #include <iostream> #include <vtkSmartPointer.h> #include <vtkSphereSource.h> #include <vtkActor.h> #include <vtkConeSource.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> Read more…
We have to calculate the vector on the special direction firstly. void CalculateVecComponent(PointStruct originVec, PointStruct &axis0, PointStruct &vecOnAxis) { double cosTheta = originVec.Dot( axis0 ); return axis0*cosTheta; } Project point on line Point GetProjectPtOnDir(Point pt, Point dir, Point startPt) { dir.Unit(); Point ptVector = pt – startPt; double cosTheta = Read more…
I had built VTK-8.1.1 and Qt5.12.1. After installing pyqt, I wrote a simple project and run it, the error message showed that it needs the newer version of Qt 5.15. So I download Qt-5.15.1 from https://download.qt.io/archive/qt , build it, and install all libraries. I didn’t find QtCreator app, therefore I Read more…
Create two half spheres and save them in a vtp file by ParaView. We will use it to explore an algorithm that finds the two separated cut list and sort all points in every list. The original scene is like the following images. Use vtkCutter to create cut lines that Read more…