This is my (Josef's) development repository for G3D development. It is a greatly reduced set of files from the subversion repository in an effort to make branched development lighter weight. The core repository remains the sourceforge repository.
To use this repository, clone it in whatever location you want, then take just the .git directory and copy it into the location where you have G3D checkout out from subversion. You will then be able to svn up to get the latest from subversion svn commit to commit the latest changes to subversion as well as use all of the git magic you want for branched development. There may still be some sloppiness when switching between committing/pushing to svn/git, particularly when new stuff is committed to svn.