During the last few years, I've been seeing a certain type of camera movement quite frequently, in all kinds of animations. The clearest example was in an UPN promo that Belief Design made a few years ago, and was discussed here in an old thread:
1) Show some stuff.
2) The camera moves and rotates...
3) ...towards some other stuff.
Now, my question is: is there any particular reason why, in 2), the camera always rotates in 90 (or 180) degree turns? First I thought that it was because the "stuff" shown tends to have a square shape, so the 90º turn is the most natural, but I can't help suspecting that there is more to it. It seems to me that this kind of animation doesn't have any specially fancy trick, and is just a matter of precomposing and parenting to nulls (either the camera or the entire scene), but I can't help having the nagging feeling that there's some kind of plugin, or tutorial, or recipe for this kind of movement that everybody knows but me, and that it requires 90º turns. In other words: do people use these turns because of aesthetical or technical reasons?
(As I said, the above isn' the only example I found, only the clearest. Other ones, although not exactly alike, are: