Ok, so you want to make a door. Well, once you know how, it is fairly simple, but there are a couple of tricks. First you need a place to put your door. you will need two very close together, a solid brush joining the two rooms, and a cut brush the size of your door where you want your door(or what ever way you want to do it). Ok, now make a solid block actor and put it in the empty space created by the cut brush. If you make the door exactly the same dimensions as the cut brush, you may have a hard time selecting the door instead of the cut brush, So you might want to consider making the door slightly larger than the cut brush, doing the animations then resizing the door. You can also rotate the cut brush, do your animations, then rotate the cut brush back into place. Now select door door and click on hte models tab. Click on the add model button. Call it door1 or whatever.
Next click on the template tab make sure the modify brush button is pushed. select door from the list box, and create a door entity. Now move that entity to middle of the door model you already created. Now in the entity editor (Menu Entity:Entity Editor) Select your door entity in the list box and double click on the word model. Now select what ever you called your door in the list box. Now click on the models tab. Here is where all the animation happens.
with your door selected, click on the animate button, move your door however you want it moved, then click the "end animation" button. When you do that, an entry field will pop-up and ask you to enter key time. This is a time in seconds for the key frame you just made by moving your door. OK, lets do some examples. Start with a simple sliding door.
You notice that I have four key frames. Key frame at 0.0 seconds is just the start with he door closed. The picture shows the placement of the 5.0 second key frame with the door in the fully open position. The door is highlighted in light-blue. Key frame 10 has the door in the same position as key frame 5. Key frame 15 has the door moved back to closed position. The net result is a door that takes 5 seconds to open, stay open for 5 seconds, then takes 5 seconds to close. You can adjust these numbers to suit yourself. Great, but what if we want a swinging door. Here is the tricky part. A swinging door means that you have to rotate the door using the rotate button
The trick part is as follows. You have to set the point of rotation
of the door correctly, or the door will rotate about the wrong point. to do this use the "set origin"
button. When you press that button, a blue highlighted x (entity marker) will appear in the center of your door.
Drag this x to the corner you want the dorr to rotate about. Make sure you use all the views to be sure you have
it in the right place. Now when you push the rotate buton, the door should rotate the right way. You might get
unexpected results if you have the wrong view active so check that if your door rotates the wrong way. Now create
your key frames as you like (using the animate-end animation combo as needed) and compile your level and admire
your handiwork.