Could someone enlighten me on certain tips of using monster spawners on .net/.org? - any requirements to spawn passive mobs (when spawner is on the floor/above the floor)? - any requirements to spawn hostile mobs? The idea is simple - to place spawner so that its room could be easily used for both spawning/disposing both passive and hostile mobs, wherever necessary. Thanks in advance.
You need it to be dark with hostiles, and you need it to be light & have grass under/next to the spawner to spawn passives.
If you are looking for a room that spawns both passive and hostile mobs redstone lamps would be the best way to go.