Tetris We had uploaded a new game Tetris on the web page: https://www.weiy.cc/2024/05/09/tetris/ You can play on the desktop computer with four buttons, up, down, left, and right. You can also play with virtual buttons on the screen if you are using a mobile smartphone or mobile computer. Demo on Read more…
The article shows how to create a simple vtk render window project and show it in the web browser. We need emscripten tool and the visualization toolkit installed. emscripten : https://emscripten.org/docs/getting_started/downloads.html VTK: https://vtk.org/ Build the VTK source to get JS library before our coding. This example uses C plus plus Read more…
I found a bug when we do matrix inverse calculation by vtkTransform object. The version 8.2.0 and 9.1.0 of VTK has the same potential risk in vtkMatrix4x4::Invert(const double inElements[16], double outElements[16]).Let’s see the source code, it judges whether the determinant value is zero by ==. The equal comparison operation for Read more…
We had used vtkImplicitPolyDataDistance to calculate the distance from a point to the target points set in the post Calculate Distance From A Point To PolyData In VTK. We will try a new way using KD-Tree to find the closest point to the test point. The following example puts a Read more…
std::thread #include <iostream> #include <thread> #include <chrono> void f1(int n) { for (int i = 0; i < 5; ++i) { std::cout << “function f1 executing\n”; ++n; std::this_thread::sleep_for(std::chrono::milliseconds(10)); } } void f2(int& n) { for (int i = 0; i < 5; ++i) { std::cout << “function f2 executing\n”; ++n; Read more…
Constexpr : Know Value At Compile Time int main(int argc, char** argv ) { int size0; constexpr auto size1 = 10; //constexpr auto size2 = size0; //error: constexpr variable ‘size2’ must be initialized by a constant expression return 0; } Mark Function Delete To Avoid Data Type Conversion void ShowValue(double Read more…
Get field value by std::get from container We can use std::get to fetch field value from container object. It can help us to avoid use iteractor to access first or second element. #include <iostream> #include <tuple> #include <string> #include <map> #include <vector> using namespace std; using Info = std::tuple<std::string, int, Read more…
Git will show conflicts if there are many spaces in the same file. It can spend too much time to fix these conflicts if the spaces are too many. Use git help merge to refer to the manual page. ignore-space-change, ignore-all-space, ignore-space-at-eol, ignore-cr-at-eol Treats lines with the indicated type of Read more…
Here are two videos for showing using the web app on this website to show imported points and do linear transform for the mesh object. Web App : https://www.weiy.city/functions/3D-Model-Editor/ youtube youtube bilibili bilibili