The article shows how to make the original image has a retro style. Two steps need to be done. Change the red color channel of the original image. Change the brightness by a filled circle. The mathematical function used in Read more…
The article introduces how to display an image by OpenCV in CPlusPlus and Python language. The user can exit the whole program when he presses the ESC key. CPP CMakeLists.txt macro(use_cxx11) if (CMAKE_VERSION VERSION_LESS “3.1”) if (CMAKE_CXX_COMPILER_ID STREQUAL “GNU”) set 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 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 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> 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) { Read more…
git merge – master – dev – master merge dev git merge another branch.xmind
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 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 Read more…