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WebGL: 3D Viewer (JavaScript|C++|WebAssembly) {#occt_samples_webgl}
==================
This sample demonstrates simple way of using OCCT libraries in Web application written in C++ and translated into WebAssembly module using Emscripten SDK (emsdk):
https://emscripten.org/
Sample consists of the Open CASCADE 3D Viewer with a button for opening a model in BREP format.
The sample requires a WebGL 2.0 capable browser supporting WebAssembly 1.0 (Wasm).
The sample could be found within OCCT repository in folder `/samples/webgl/`.
@figure{sample_webgl.png,"",240} height=408px
Installation and configuration:
1. Install Emscripten SDK and activate minimal configuration (Python, Java and CLang) following *emsdk* documentation. Activate also MinGW when building sample on Windows host.
2. Build (using *emsdk*) or download FreeType static library.
3. Configure CMake for building Open CASCADE Technology (OCCT) static libraries (BUILD_LIBRARY_TYPE="Static").
For this, activate *emsdk* command prompt, configure CMake for building OCCT using cross-compilation toolchain, disable *BUILD_MODULE_Draw*.
4. Perform building and installation steps.
~~~~~
> ${EMSDK}/fastcomp/emscripten/cmake/Modules/Platform/Emscripten.cmake
~~~~~
5. Configure CMake for building this WebGL sample using *emsdk* with paths to OCCT and FreeType. Perform building and installation steps.
6. Copy data/occ/Ball.brep from OCCT into "samples" folder within WebGL sample installation path.
7. Navigate to installation folder and start web server from it; Python coming with *emsdk* can be used for this purpose:
~~~~~
> python -m SimpleHTTPServer 8080
~~~~~
8. Open compatible browser and enter path taking into account your web server settings:
~~~~~
> http://localhost:8080/occt-webgl-sample.html
~~~~~
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