Here is a video about configuring WebAssembly environment on Ubuntu 20.04. It records all process about configuring WebAssembly environment and running a simple test program Youtube: Bilibili:
Here is a video about building OpenCV 4.6.0 on Ubuntu 20.04. It records all process about building OpenCV library and running a simple test program. Youtube: Bilibili:
The post shows how to pass array from javascript to cpp function as parameter and how to use javascript to receive array from cpp function. We have to know the javascript TypedArray objects and different types of emscripten memory model firstly. JS TypedArray objects Type Value Range Size in bytes Read more…
The shell script build vtk in the folder build, /home/stephen/Downloads/VTK-9.2.0.rc2/build: cmake ../ -G “Unix Makefiles” \ -DVTK_USE_QVTK:BOOL=ON \ -DCMAKE_INSTALL_PREFIX=/usr/local \ -DVTK_USE_GUISUPPORT:BOOL=ON \ -DVTK_QT_VERSION=5 \ -DModule_vtkGUISupportQt:BOOL=ON \ -DModule_vtkGUISupportQtOpenGL:BOOL=ON \ -DModule_vtkGUISupportQtSQL:BOOL=ON \ -DModule_vtkGUISupportQtWebkit:BOOL=OFF \ -DModule_vtkRenderingQt:BOOL=ON \ -DModule_vtkViewsQt:BOOL=ON The sources.list for Chinese user to use ubuntu LTS 20.04 deb http://mirrors.aliyun.com/ubuntu/ trusty main restricted Read more…
We have added a new function to the image processing page: rotate the image clockwise by any angle.我们在图像处理页面增加了一个新的功能：顺时针旋转图片任意角度。 Our picture doesn’t awalys fit on the phone or computer monitor, so we need to put it right. We need to rotate the original picture. Or if you just want to make Read more…
I had found a crash bug when use vtkContourWidget by webassembly in the post Crash Bug About vtkOpenGLPolyDataMapper::UpdateShaders In vtkAbstractWidget.As we know, SetResolveCoincidentTopologyToPolygonOffset for mapper can make web page crash, related post: The Interfaces In VTK Can’t Be Used With Webassembly. After reading the source code of vtkOrientedGlyphContourRepresentation::vtkOrientedGlyphContourRepresentation(), we know Read more…
The Interfaces In VTK Can’t Be Used With Webassembly Setting point size and line width doesn’t work vtkProperty.h Shift polygons, lines and points will fail in wasm. It will cause crash on web page. The new polydata generated by vtkFeatureEdge algorithm can’t be rendered in WebGL because something is wrong Read more…
I can’t display vtkContourWidget object on web page by wasm file.The following code snippet is very simple, create a circle and show it, we can modify it by vtkContourWidget object.The example works in CPlusCPlus program.VTK version: 9.0.2. But it will crash on our web page. Output: It seems something wrong Read more…
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…