Imports and exports Three.js' ASCII JSON format.
Copy the io_mesh_threejs folder to the scripts/addons folder. If it doesn't exist, create it. The full path is OS-dependent (see below).
Once that is done, you need to activate the plugin. Open Blender preferences, look for
Addons, search for
three, enable the checkbox next to the
Import-Export: three.js format entry.
Should look like this:
Depends on where blender.app is. Assuming you copied it to your Applications folder:
By default, this should look like:
For Ubuntu users who installed Blender 2.68 via apt-get, this is the location:
Activate the Import-Export addon under "User Preferences" > "Addons" and then use the regular Import and Export menu within Blender, select