Duration: 0:31

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In this short video you can see that the door appears to rotate to allow Spyro inside. Well thats not excatlly how it works. What really happens in that there are 2 main components to the door: The block or space data that says wheather Spyro can walk in the space in the door (litteraly an invisible solid block). And the other type of data is just the door's image data, which just shows if the door is closed or open. As you can see in this video, you can make the door appear closed but still walk in it. The reason why this game and many others spearate data that way is because it would take up too much space if each texture was it's own surface.