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Doors are very simple to create, but do have some limitations and at least o­ne editing flaw. Limitations include being able to combine entities such as breakable glass or moving parts as part of the door. The flaw that I speak of is texture applications. In some cases (not many) you may come across a texture that will not line up in the finished level, but will appear to be fine in the editor. This can be frustrating, but can be solved by moving it to the location that appears to be correct when viewing it from the game. If the door is too far to the left by about 10 units, then move it to the right about ten units, render the level, and check to see if the texture is properly aligned.

So, let's create a sliding door.

1. Create a brush that will be used as your door. In my case, it will be a brush that is 96 units high and 64 units wide. It can be as simple or as complicated as you like. If you want to add a window or other details, do so now, but remember that you cannot make these brushes functional (breakable, etc.).

2. Spend some time aligning the texture to your liking. If this happens to be a door texture that you chose from the game, then spend a lot of time aligning the texture since the way that Raven created the texture makes is quite difficult to easily prepare.

3. Now we need to add the origin brush. It is the (usually) green colored brush marked with the word origin and is a crucial part of the functioning door. Center this brush o­n the pivot (sliding) point you wish the door to originate from (if you want the door to swing from the left, then center the brush over the doors left edge).

4. Select all the components that make up the door including the origin point. Right click o­n the editor graph page (open the entity list) and choose fun_door from the func list.

5. Be sure to select the appropriate angle that the door will open towards within the entity editor. Choose the flag for Auto Open unless you have decided to add triggers that cause the door to open instead.

That should complete the construction of your sliding door.