'rot' ['u'|'d'|'r'|'l'|'c' <angle>]|
This keyword is used to rotate the view-direction to the model. For example
rot u 10
will rotate the view-direction 10 degrees upwards. The meaning of the other letters is down d, right r, left l, clockwise c. The remaining letters will rotate the view into a pre-defined direction. For example the user will look in x direction after the command
and against the x direction with the command
and so on.