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We can use vtkParametricTorus to construct a curved 3D arrow. However, during this process, the opening needs to be closed, and the boundary should be preprocessed: merge nearby points, remove duplicate points, and triangulate. RotationArrow.h RotationArrow.cpp Some interfaces of BasicMethod can be found on the websize.
Temporarily disable multiple threads for VTK, then resume them later. Code example:
Here are two methods used to sample points on a model (surface mesh or 3D polydata). Filter connected points Use BFS (Breadth First Search) algorithm to get connected points in polyData. Iterate through all the points in jumps to achieve the purpose of sampling. Sampling points by spatial distance Calculate Read more…
Static Library Here is our project. Build MeshLib to a static library file to be used in widget. Source code files in MeshLib: MeshAnalyzer.h MeshAnalyzer.cpp CMakeLists.txt Key files in UI project: Widget.cpp Configures in CMakeLists.txt We need to set CMAKE_INSTALL_PREFIX for CMake and install headers and lib file to the Read more…
Find a server you already have with sufficient memory and other resources. Using Docker Images to Quickly Start Services on the Server Refer to: https://rustdesk.com/docs/en/self-host/rustdesk-server-oss/docker/ Step 1: Configure Service Ports Step 2: Pull the Docker Image Step 3: Start Containers Simple startup commands: Step 4: Check Containers Step 5: Stop Read more…
We had met a bug about _emscripten_set_wheel_callback_on_thread in web app based on wasm. Relative post: https://www.weiy.city/2025/02/uncaught-typeerror-cannot-read-properties-of-null-reading-onwheel-from-_emscripten_set_wheel_callback_on_thread/ Let’s explore how was the function generated in the final wasm file. The function _emscripten_set_wheel_callback_on_thread was from emscripten_set_wheel_callback_on_thread in src/library_html5.js. Read js files and html5.h under emsdk to find the called logic. Code in Read more…
There is Aborted crash on browser when I resize window. My web app is based on VTK wasm. Check uiEventHandlerFunc in Test.js: Then we can read /emsdk/upstream/emscripten/src/library_html5.js and find registerUiEventCallback and uiEventHandlerFunc on the file. There is checkInt32(e.detail) in registerUiEventCallback in exported js file Test.js which was generated from emsdk Read more…
I encountered a crash bug on browser in a destructor of class. I found the definition of emscripten_set_wheel_callback_on_thread in `/emsdk/upstream/emscripten/src/library_html5.js`. It doesn’t check target before using it. It’s bad code. So I checked the version of emsdk: Then I upgraded emsdk to 3.1.51: Had been new version: There is a Read more…