Hello
As far as I know, as the question is about
export capabilities, Sweethome 3D is able to export its models in the WaveFront OBJ format but keep in mind that it's not a general purpose exporter, it's focused on what Sweethome 3D must support and Sweethome 3D is under GPL v2 whereas Java3D is under GPL v2 with classpath exception which implies that if you use Sweethome 3D export capabilities, you'll have to put your source code under GPL v2.