minecraft-feed-the-beastminecraft-java-edition
I know mobs do not spawn on blocks lit with at least 7 light on it. But are there any mods, preferably already in FTB that makes sure mobs will not spawn in a specific area? I'd like to stay on hard mode while still building all kinda cool but expensive and complicated stuff and i really cant have a creeper sneak up on me when i am busy building within my walls.
I do not really care about mobs spawning outside my walls and walking in since my place is pretty huge.
Update: According to Notch's blog post about changes coming in 1.6, the torches-on-fast-leaves bug is getting fixed:
This means that monsters can no longer spawn on leaves, either, as they are always considered transparent, even when using Fast graphics.
Monsters can spawn on any solid, non-transparent block which is at light level 7 or lower.
Signs, torches, rails, and the like are ignored when spawning monsters; they'll spawn on the block underneath just fine. This is why one-block-wide railways need to be lit.
Transparency means whether or not light passes through a block rather than whether you can see through it. Half-blocks, doors, stairs, and glass all count as transparent and prevent monster spawning. Leaves, oddly, count as transparent only when Fancy graphics are enabled. An easy way to test a block for transparency is to try placing a torch or sign on it — neither can be placed on transparent blocks. (Meaning that torches can be placed on leaves with Fast graphics, but not with Fancy.)
Torches put out light level 14, so monsters can't spawn within 5 blocks of a torch orthogonally or 3 blocks diagonally. If you put your torches in a diamond pattern, they can be up to 9 blocks apart, but it's best to move them closer than that on uneven terrain. (I use 5 myself.)
If you like, you can actually torch your treetops by changing your graphics to Fast, placing the torches, and switching back. Your torches will stay rooted, even though you wouldn't normally be able to place them that way. Personally, I think it makes them look rather cheerful. :-)
Well, indeed mobs don't spawn on glass or slabs (half-blocks). The way you describe it, that spider couldn't have spawned on the roof. There is not much more to say without actually seeing the house and its surroundings. Is it possible that the spider tracked you from outside and climbed on the roof (unlike other mobs, spiders can track you through walls)? Is it possible that the spider spawned on a nearby cliff or tree and fell on the roof?
Best Answer
Depending on whether it is in your mod pack, the best mod for making a certain area absolutely safe from mobs in FTB is a system from "Modular Force Field System". Once you have a field set up around the area you want protected, use the NPC Defense Upgrade in your MFFS. This will instantly kill any hostile mob that enters or spawns inside the field.
Running it will be rather expensive in power and resources, though, so you may want to pulse it on and off with a timer.