Vertical door starting open?

[Adny]

If you don't need it to be functional, you can just have a static door moved to the upper position. On second thought, it could be function if switch it out with a normal vert door while the player can't see it (i.e. after the player passes through the doorway).

Alternatively you could do a fade in long enough to cover the action of the door moving up in the very beginning.