The source code for the j3d-core project is copyrighted code that is licensed to individuals or companies who download or otherwise access the code.
The copyright notice for this project is in COPYRIGHT.txt
The source code license information for this project is in LICENSE.txt
Additional information and license restrictions for third party source code are found in the THIRDPARTY-LICENSE-*.txt files.
Java3D 1.7.2 is now mavenised on Maven Central just include a dependency in your pom.xml like so
<dependencies>
<dependency>
<groupId>org.jogamp.java3d</groupId>
<artifactId>java3d-core</artifactId>
<version>1.7.2</version>
</dependency>
...
</dependencies>
https://jogamp.org/wiki/index.php?title=Java3D_API_Documentation
For the best kick off point see /docs/tutorial/
For a description of performance see /docs/perf_guide.txt
Old Java3d project site with lots of information https://java.net/projects/java3d
General technical tips https://java.net/projects/java3d/pages/Java3DApplicationDev
Using the newer ES2/ES3 pipeline /docs/GL2ES2PipelineUsageGuide.md
http://www.java3d.org/tutorial.html
http://jogamp.org/wiki/index.php/Java3D_FAQ
contact the forum at
http://forum.jogamp.org/