I was wondering if you could cast shatter on the other side of a wall or on a point that you can't see. The spell description for shatter says that it is cast on a point that you choose. Other than that it does not say anything about how it's cast aside from it erupting from a point, so it seems there is no line involved.
Would that also mean I can cast it in a room above me for example without even needing to see it? It says that if you cast an AOE spell it comes onto the near side of that obstruction, is that based on a line from where you cast or where the spell originates?