Thank you for your instant reply, Hans!

I can understand the approach with the six images, but the problem is different in that the description text of the box object should be rendered dynamically on the sides of the cube. I don't know whether SH3D currently supports such a feature, and I would be grateful for any solution - up to and including extensions to the Java source code.

PS: I am currently porting the source code to Java21, but without WebStart (JNLP) and applets