This is a Scala.js facade of three.js javascript 3D library (http://threejs.org/). All the code is inside facade folder (threejs subproject).
In order to resolve a lib you should add a resolver::
resolvers += sbt.Resolver.bintrayRepo("scalajs-facades", "scalajs-facades-releases") //add resolver
libraryDependencies += "org.scalajs" %%% "threejs-facade" % "0.0.88-0.1.9" //add dependency
You can see an example in preview subproject.
To run preview:
sbt fastOptJS
open index.html