In TM you have 5 values for the viewport(Camera)
Position
**X, Y, Z ** (the camera position based on world origin)
Rotation
X (always greyed) Y (the tilt in degrees) Z (the swing )
Tilt is + up -down
swing has values -180 to 180

but I am not sure (sooner or later, I'm going to have to face the fact i am a goddamn moron...)

I made a simple (probably jerky) script to retrieve sketchup scenes camera infos for twinmotion

the rbz : http://u.pc.cd/lJ2ctalK