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# WebAssembly Cone Example
This guide illustrates the process of developing a 3D object viewer tailored for WebAssembly. Notably, it offers the flexibility to select the rendering backend, either OpenGL or WebGPU, during runtime.
The additional steps required are:
1. Update `CMakeLists.txt` so that the `VTK::RenderingWebGPU` component is requested when finding VTK.
2. Link your targets with `RenderingWebGPU`. There is no problem linking to both `RenderingWebGPU` and `RenderingOpenGL2`.
3. Preload environment variable with `VTK_GRAPHICS_BACKEND` set to 'WEBGPU'.
## Build
```
emcmake cmake \
-G Ninja \
-S /path/to/vtk/Examples/Emscripten/Cxx/ConeMultiBackend \
-B out/build \
-DVTK_DIR=/path/to/where/vtk/wasm/was/built
cmake --build out/build
```
## Serve and test generated code
```
cd out/build
python3 -m http.server 8000
```
Open your browser to http://localhost:8000
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