How to make a rotating door with glass?

So that's the question...

(Assuming you know how to make rotating doors) If you want to add a door made of glass, simple create a regular func_door_rotating with a glass texture, set the rendermode to texture, and the render amount between 100-200.

If you want to make a regular door with a glass window in it, create the part of the door without the window, make it a regular func_door_rotating and set it up how you want it. Then make the window where you want it, and make it a func_door_rotating with the same origin. i.e. the origin brushes of the door and the window should coincide. Set the rendermode to texture, and the render amount between 100 and 200.

For the two to rotate together, the two entites should have exactly the same properties, except for the rendermode and render amount.

If you can't figure it out from what Frag said, there's a more in depth
tutorial here: http://halflife.qeradiant.com/halflife/athl4.htm

Simply make two different entities. One has the glass values and the glass textures (remember to use null on the faces the player will never see), and the other entity will have the normal no values. Put origin in the center like usual, though make sure that origins are the same as the other origin. Then tie each to an func_rotating like you'd normaly do and voila. I'd use a trigger_multiple to activate the func_rotating though, otherwise if you touch the lips of the door without the glass the rotating will not be in sync.