Originally Posted by Rising_Dusk
Cinematics also require much more dynamic terrain than gallery shots. Your terrain in both playable and cinematic cases requires that it look good from all angles and is also playable from the in-game angle. This really limits the level of above-floor-level detailing you can put without obscuring the area units must traverse.
This also forces you to deal with nasty clipping issues due to the nature of many WC3 and imported doodads.
That's true, but it's similar, whereas playable terrain is almost completely different.