There are many techniques available. However, the general recommendation isOr put another way:
that unless you know what you are doing you should just implement simple
multi-tap cascaded shadow maps.
If you have no idea what the hell you're doing, try cascaded shadow maps -- what could go wrong?Oh wait, X-Plane 10 uses CSM. Well, I guess that's for the best...
(The guide also suggests that "3 levels are sufficient to provide good shadow detail for any scene." Have they seen our scene graph?)