[JAVA3D] Game Direction

[silvano]

I'm working on a game in which the user needs to move an object around a 3D "room", allowing 6 degrees of freedom. The object has a DOF (direction of flight) and Up vector to define its direction of movement. I need to allow the user a set of operations such as rotation along the 3 axis (X, Y, and Z) and translations towards (and backwards) the DOF vector. The problem is that somehow I need to keep track of the object's status so that next time I perform, for example, a rotation it should take into account the local co-ordinate system (the modified DOF and Up vectors) rather than the canonical axes (X, Y, and Z - which are the room's co-ordinate system).     if anybody have suggestions, give-me an example please!!       thank you!!!   Silvano Malfatti