The json export plugin works well for simple geometries but it'll only export one mesh at a time - scenes and linked meshes aren't supported. For more complex things I export as Collada and use the colladaLoader that's in the examples in three.js's github repo.
Also, the JSONLoader and file format used in this tutorial are almost deprecated.
Three.js has a newer JSON format[1], a new Blender exporter [2], and a new loader (THREE.ObjectLoader) in recent versions. They are much more fully featured and efficient compared to the earlier tools. They are more or less the preferred way to handle Blender->JSON->Three.js (at least for static meshes) now.
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[ 1.6 ms ] story [ 25.7 ms ] threadSadly, it's not without it's own problems. It has a few bugs that make it hard to import models from Maya or Autodesk's FBX to collada converter.
Three.js has a newer JSON format[1], a new Blender exporter [2], and a new loader (THREE.ObjectLoader) in recent versions. They are much more fully featured and efficient compared to the earlier tools. They are more or less the preferred way to handle Blender->JSON->Three.js (at least for static meshes) now.
[1] https://github.com/mrdoob/three.js/wiki/JSON-Object-Scene-fo...
[2] https://github.com/mrdoob/three.js/tree/dev/utils/exporters/...
[3] https://github.com/mrdoob/three.js/blob/master/src/loaders/O...