Hello,
in he first place I want to thank You for developing such a nice tool.

I'm also trying to run the render in headless mode with SW3D 6.2 on a linux machine. I have fallowed You guide, but unfortunately I'm getting

No X11 DISPLAY variable was set, but this program performed an operation which requires it.
at javax.media.j3d.VirtualUniverse.<clinit>(VirtualUniverse.java:294)

error when trying to run it on a server. I have found Your post on jogamp about editing VirtualUniverse.java class, but I'm afraid it's to difficult for me. Are You able to provide modified version of j3dcore.jar just to make it more available to use it by broader group of people?