Quote from OmgMTG on January 23, 2012, 11:58 am

This took me quite some time to figure out how to do properly due to the lack of tutorialsvideos pertaining to this specific subject. To spare the rest of the Portal 2 mapping community the trouble, here is how to make a rotating door using a prop_dynamic entity:

Place a prop_dynamic entity in your map and look at its properties.

Go to the World Model, and in the filter type in 'door' (no quotations).

Choose props_undergroundunderground_door_dynamic.mdl or a hinged door of your choice (there are some models that do not work, experiment at your leisure).

Give your new door a name. ex: rotating_door1.

Now make 2 4x4x108 block brushes with the 'invisible' texture.

Place the two brushes near the front of the door on opposite sides.

http://i1254.photobucket.com/albums/hh6 ... ngdoor.jpg

The brushes should not impede the player on the way through the door.

Ctrl+click both blocks and tie them to a func_button.

Go to the new func_button properties and apply the following settings under Outputs:

http://i1254.photobucket.com/albums/hh6 ... erties.jpg

OnIn > Door_name > SetAnimation > open

OnOut > Door_name > SetAnimation > close

Under Flags, make sure Don't move and Use Activates are checked.

Save and compile your map. Enjoy your new door.