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I'm trying to create a 3D flight sim. I'm using pitch, roll and turn commands to control the object.

I've set up a display to show each of the 3 angle values

I've linked the arrow keys to control pitch and roll and can control the object's attitide properly using them.

When I rotate the model purely around the pitch axis, only the displayed pitch angle changes. This is true no matter what the starting orientaton of the model is.

When I rotate the model purely around the roll axis, then the pitch and turn angles also change. This is true no matter what the starting orientaton of the model is except where the pitch and turn orientation are both 0. The maximum amount by which they change during a complete rotation about the roll axis varies depending upon the starting orientation.

Is this a bug or some strange (and unhelpful?) functionality??

The pitch, roll, turn commands work on a local coordinate system and not a global coordinate system. They are a little incompatable with the usual dbRotateObject() command and also mess up your angles a little.

Thanks Matty - is there any way to determine what the angle values are?

It is the real world values I'm interested in.

As said, global rotations angles are done with dbRotateObject, and you can retrieve those angles with the dbObjectAngle functions.

To know the local rotation angles for turn/pitch/roll, accumulate in a corresponding variable the value of each local rotation performed.

Also, do not mix global and local rotations, always perform global rotations (if any) and then the local rotations