Hi,
Unfortunately Java3D 1.6 never got to the point of having mavenistation formally included, and due to a major contributor pulling out of github when Microsoft took over, it looks like the pull requests are broken now.
The easiest thing to do is to use the scijava fork of Java3D which is up to date but also has the maven pom.xml file setup
https://github.com/scijava/java3d-corehttps://github.com/scijava/java3d-utilshttps://github.com/scijava/vecmath
Here is a discussion of the mavenisation work.
http://forum.jogamp.org/Java-3D-Use-Maven-to-build-and-publish-Maven-artifacts-td4035555.htmlSorry this isn't easier, I haven't yet published the Java3D 1.7 artifacts to maven, but I should do so, then there would be that option as well.