As we know, vtkTransformFilter can change points’ positions and rewrite data. Then we use vtkTransform object to do linear transform for 3D model. This process is not equal to the multiplication of these two matrices. We can deduce the event in our online tool: 3D Model Editor.Open module linear transform tester. We Read more…
This article is a sequel to the previous one https://www.weiy.city/2023/04/draw-a-circle-around-mouse-postion-on-screen/. Let’s check if the vertex of cone is inside the red circle when we move mouse. CustomIteractorStyle.cpp UPaintBrush.cpp UPaintBrush.h Output:
This post is based on an old project Use ITK And VTK To Show DICOM Image. We want to add an above layer which drawed translucent red color on the gray image. Use alpha blend algorithm to merge two different color: origin color = $(R_1, G_1, B_1, 255)$ canvas color Read more…
OS: Ubuntu 22.04.2 LTS. Download eigen from website: https://eigen.tuxfamily.org/index.php?title=Main_Page Small Eigen Project Write a file main.cpp which use eigen library. Build and run it. Use Lapack In Eigen In C++ Project Write test code to use lapack, build and run the project. Create a file matrix.txt Run the executable file by Read more…
We create a new tool compound interest calculator. Input your investment plan, our tool will draw the money growing scene in the future. Tool: Youtube Bilibili
We will introduce the transformation equation for 3D Coordinate Value XYZ And 2D Texture Coordinate UVR. Try to represent the UVR value by x,y, and z. Here is derivation process. Because U Read more…
In graphics and signal processing, there are many filters to compute data. We show two signal processing filters Gaussian filter and tent filter at our web tool 3D Model Editor. Gaussian Filter The resulting function is The 2D Gaussian filter, which is both separable and radially symmetric. Tent Read more…
The eigenvector of a linear transformation doesn’t change in the transformation, and the scale of this vector under the transformation is called the eigenvalue. Practice We use 3D Model Editor to perform the following linear transformation: For more information on how to use the web app 3D Model Editor to Read more…
There are many magical properties in matrix computation, such as: AB != BA A != 0, B != 0, but maybe AB = 0. AB = AC, A != 0, but we can’t get that B = C. People couldn’t understand why it was so different from ordinary numerical calculations Read more…