Download the Editor Toolkit and use Import Package to install into current project. Alternatively, you can download the Source Version. You just need to copy/paste the Babylon folder inside the Assets folder of your unity game project folder. Once installed, unity will detect the plugin, compile it and add the toolkit Export Panels to your project.
Note: The legacy exporter plugin can be found here: https://github.com/BabylonJS/Exporters/tree/master/Unity%205/Deprecated
Create a new unity game project then add the BabylonJS Editor Toolkit to your project. You can either copy toolkit source to your root asset folder or you can import the toolkit unity package distribution file.
Configure optional Runtime Script Compiler locations. You can download and install or update the current Node Runtime to the default location. Then use node package manager to install or update the latest TypeScript Compiler to the default location.
Install TypeScript Command
Mac OSX: sudo npm install -g typescript
Windows: npm install -g typescript
Default TypeScript Location
Mac OSX: /usr/local/bin/tsc
Default Node Runtime Location
Mac OSX: /usr/local/bin/node
Windows: C:\Program Files\nodejs\node.exe
On the Scene Exporter panel, press the Save Export Settings button to save the project export settings to disk. Export settings will also detect changes and save on each build.
File -> New Scene to create a new empty scene. Unity will create a main camera and a directional light by default.
File -> Save Scene As to name and save your current scene to a folder in your project assets. The toolkit will use this scene name for exporting content.
Global Startup Script - If defined, the global startup script is the main entry point for every scene. You can use the global startup script to attach the SceneManager.ExecuteWhenReady handler that will get called first for each and every scene.
Default Scene Controller - Any scene options for your project can be set using any script components you see fit. You can optionally add an empty game object and attach a default scene controller script component to easily setup built in options for your scene.
Cameras, Lights And Meshes - Add any supported camera, light and mesh content to your scene. You can attach script components, assign materials, create particle systems, setup animations, optimize geometry and utilize any unity editor tools to manage scene content.
To build and preview the current scene, press the Play button or the Build And Preview button on the Scene Exporter panel. Select the Export Scene to simply export the current scene content without a full build and preview. This is very useful for creating Import Mesh only scenes. All project output will be saved to the Export folder of your unity game project folder.