How to make a continuous rotating object
Note: This tutorial assumes you already have the basics of a level, ie. a hollowed box and a player start inside it. =]  

For this tutorial we'll be creating a fan. 

Step 1: 

Create the basic shape of your fan. Here I made a simple fan with four blades, a center, and a pole holding it to the ceiling.
 
 
______________________________________Step 3: 
 
 
Create another brush and place it in the center of your fan. You want this brush to be bigger than the center of the fan and the center of this brush and the center of the fan must be exactly the same. The reason for this is the fan will use the center of this new brush as it's point of rotation. Texture this brush with the "origin" texture.
Step 3: 
Now, select all the parts of the fan and the origin brush you just created and group them together. Select that group and apply the Func\Rotating entity to it. In it's properties, enter a value in the speed field, 100 is pretty good, and select Start on from the spawnflags pull down menu.

That's it! Go rotate some objects!

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