Arqade Asked by Nick H on December 3, 2020
Since torches prevent mobs from spawning, is it possible to place enough torches within a specific radius to ensure safety during the night? I’m thinking of a situation without any shelter built, more along the lines of a flat plain. If it is possible, how many torches/how far out do I need to go to make that area safe?
Learn about light:
Every tile that isn't a light source has a luminance of one minus the luminance of its neighbors. For example, if you had a 6 and a 4 luminance sources close to each other, attached to a wall, you'd have this distribution:
1
121
1 12321
121 1234321
1232123454321
123432345654321
12┴─────┴4321
1 12321
121
1
...except this works in three dimensions instead of two!
Learn about spawning:
In practice:
Here's what I try to do to ensure a luminance of 7 consistently along a line:
Place the first torch. Pardon my hexadecimal one-sided luminance graph:
EDCBA98765432100000000000000000
↑
Proceed until you find two tiles looking exactly like the next, then go back one.
EDCBA98765432100000000000000000
↑
Plant a torch there. Lo and behold, minimum luminance there will be 8!
EDCBA9889ABCDEDCBA98765432100
↑
GOTO 1
You can adapt this algorithm to your necessities with ease. Just plant a torch in the darkest area when in doubt. (Duh.)
Also:
In your mining, be aware that any surface is good enough to spawn...
↓↓↓ ↓↓ All positions marked with an arrow are valid
███ ██↓ spawning points, to the best of my knowledge,
█ █↓ and they all can lead to the just spawned mob
█ █ to reach you.
█ ↓█
█↓↓↓↓↓█ Be vigilant and don't mine caves from the
███████ bottom up :(
Learn how to keep mob that has spawned outside: make traps.
Correct answer by badp on December 3, 2020
First, some mob spawning science:
Using these measurements, it looks like you would have to make a grid of torches 13 squares apart that covers a 144x144 block area (excepting the no spawn circle around you, if you like).
Answered by sjohnston on December 3, 2020
Mobs will spawn in areas of light 7 or lower. Source
Torches provide a light of 14, with the light value being reduced by 1 for every tile away.
14 13 12 11 10 9 8 9 10 11 12 13 14
Consider the line of light values above. The 14's are torches. If you put the torches no more than 12 squares away, you will prevent any monster from spawning in a straight line; do note however, that if you go with a strictly grid based system, you will have dark "centers" made from the torch squares. I recommend a staggered grid, each line "shifted" 6 squares from the other, so that the light values prevent the centers from getting to dark.
Answered by Raven Dreamer on December 3, 2020
Torches Provide a light level of 14. Note that this is to the block that they are in. Adjacent blocks have a light level of 13. Mobs require a light level of 7 or less to spawn. This means that mobs can't spawn within 7 of a lit torch. So placing a torch every thirteen tiles will keep a hallway lit.
T____________T
01234567890123
You can expand this to two dimensions by placing a second line of torches 7 to one side and offset by seven.
T____________T______
____________________
____________________
____________________
____________________
____________________
______T____________T
See this post
Answered by Theo Belaire on December 3, 2020
In a straight hallway torches placed on the floor can be 13 spaces apart safely. But in an open area they should be 12 spaces apart, then offset 7 spaces and then 6 spaces, not 7 and 7.
This is confusing until you draw it out. In my examples below the grid on the left is the previously recommended and incorrect 13/7/7 offset; notice how it results in squares with 7 luminance that trigger mob spawns. The grid on the right is the correct 12/7/6 offset resulting in minimum 8 luminance across the board. The green bordered area shows how both 12 or 13 spaces apart are fine for a straight line.
This assumes a level area. YMMV on uneven terrain or elevation changes, so you'll have to double check darker squares' luminance using F3. Once it gets level again you can resume the righthand pattern above.
Likewise the 13 spaces from torch to torch (for 12 lighted spaces between) in a hallway assumes a straight line and torches placed on the floor. Torches placed on the wall are not as efficient, requiring 11 spaces torch to torch (for 10 lighted spaces between). Any turns affect the count.
For an extreme example, torch performance in diagonal/zigzag hallways also depends on where you place the torches. Torches placed on the floor are most efficient by far, illuminating their floor square at 14 and safely lighting 12 intervening spaces between torches. Torches placed on the walls are dimmer and must be closer together, only illuminating the floor squares under them to 13, and safely lighting only 9 intervening spaces! So if you're short on torches place them on the floor.
Answered by Tinderbox on December 3, 2020
All surfaces that are either not a full block (like dirt or stone etc),are leaves or glass of any color or if their are any redstone components that arent full blocks. There is also a "mob cap" where the amount of monsters is so great that the game wont attempt to spawn any anymore, there are ways you can abuse this(nametags, shulkers, and enderman and some others) you wont need to worry about this unless your doing some weird stuff with mob farms or something along those lines. Spawners have a area around them that they check for to see if they can spawn mobs. for example if you have a zombie spawner and their are numerous zombies within the 8x8x3 area they wont spawn. There are alternate sources of light like nether portals and mushrooms but these are mostly impractical.
Answered by Dogman on December 3, 2020
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