I've been playing around with P3D, and I think that box() uses the current origin as its center.  Is there any way to force box() to use the current origin as a corner, or do I have to work this out myself?

I'm trying to use  this sketch, but Processing consistently dies with a stubborn

Syntax error on token "interface", Identifier expected

error.  Apparently this error message isn't specific to Processing, but I want to know what causes it so that I can fix it.

I'm running Linux and I have the legit Sun JVM, but I don't know how to make Processing use it.  Which environment variable or whatever do I change?