Rotating Objects ith OPL-Editor

Hey Guys!

I am setting up a p-server to play ith my friends on it. Now I ant to edit the map to rebuild the cities. But how do I rotate the Objects (The gate of the old castle in my case)? I used the search-function of this forum and google, but I didn't find anything useful. I only need the formula (or something familar) to calculate degrees to X Y Z W-value.

It would be very nice if someone of you could explain it.

Thanks

Lg Tom