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BUILD_WASM.md

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Introduction

F3D can be built in WebAssembly using emscripten in order to embed it into a web browser. It is still experimental and only a small fraction of the libf3d public API is bound. An example can be seen at https://f3d.app/web

This guide is describing how to build VTK and F3D with emscripten using Docker on Linux or Windows.

Building

While it's possible to setup an emscripten cross-compiling toolchain locally, it's easier to use Docker and the provided npm scripts.

Preparing the build

Install Docker and npm locally.

Building F3D

Go to the webassembly folder and run the following command to build F3D:

npm run build:deb # or build:rel for optimized build

On completion, a folder webassembly/dist is created containing the artifacts.

Testing it locally

Five different files should be located in webassembly/dist folder:

  • f3d.js: javascript library
  • f3d.wasm: webassembly binaries
  • f3d.data: virtual filesystem containing the file specified in F3D_WASM_DATA_FILE
  • index.html: example file setting up the web page
  • favicon.ico: icon used to display the logo in the browser tab

Again, use a npm command to test locally by running a HTTP server:

npm run serve

Going to http://localhost:3000 should display the web page and load F3D web app.