Point positions to rotation

[Phat Looser]

What I am searching for is the mathematic definition of the object angles in MTA and San Andreas.

To visualize it, I am thinking about three points in 3D, and I want to use those three points to calculate the x,y and z rotation with knowledge of the position of these three points.

An example would be three airplanes which "carry" a box between them, and depending on their position (depending on the position of the airplanes), the box has to rotate.

If one of the planes moves forward, the box has to change the x rotation, thats as far as I got.

Using the euler theorem, I wanted to ask:

When calculating the object rotation, do you multiply Ax*Ay*Az, or how is the rotation calculated?

[Phat Looser]

Which rotation is done first, which last?