Each of the seeds given has 65535 matches for a total of 131072 seeds which will give the same results; also, for every other seed there are 65535 other seeds which will have the same caves, as well as the same terrain (where biomes match) and even villages and other structures, down to trees and ores, in the same places (again, if the biome matches). This is because only the biome generator, which uses its own custom 64 bit random number generator, is able to use the full 64 bit seed value; everything else uses Java's built-in RNG, which only uses 48 bits (this may also apply to other versions as well since most common languages do not have 64 bit RNGs of the sort that would be used here (the biome generator is based on the MMIX generator listed).
Here are a couple threads where I discussed this:
http://www.minecraftforum.net/forums/minecraft-discussion/seeds/2229720-can-two-different-seeds-produce-identical-worlds
http://www.minecraftforum.net/forums/minecraft-discussion/seeds/2557524-a-very-strange-seed
Note that only caves and mineshafts are affected by the repetition bug since it is a result of a multiplier value being set to 0 and they are the only ones that use it, at least directly (the game derives a unique seed for each chunk by multiplying the x and z coordinates by two numbers derived from the world seed, and either (but not both) can be 0, resulting in the corresponding coordinate having no effect on the chunk seed. Villages and temples use an additional algorithm, which is immune to this bug, to determine where they are located within a given 32x32 chunk region but should still generate the same if they have the same x and z offsets. Features like trees and ores are not affected at all because the multipliers are made to always be odd numbers, which implicitly excludes 0).
Also, in either case you can find matching seeds by adding or subtracting 2^48; among other things, this is how I found the seed mentioned in this thread (I kept adding 2^48 until you spawned right on top of the cave; you can also use this to find a seed with good caves or mineshafts, then manipulate the biomes to your liking).
In addition, as mentioned in the second thread above virtually every seed has a bug (due to the way the chunk seed is determined) that causes the same caves and mineshafts to generate at sign-reversed coordinate pairs (e.g. 100, -100 and -100, 100), with as many as 1/3 of all chunks matching (when I investigated this further a few seeds seem to be immune and the percentage of chunks that matched was always 1/(3*n); e.g. 1/3, 1/6, 1/12, etc).
-
- RLS0812
- Registered Member
-
Member for 11 years, 3 months, and 23 days
Last active Mon, Dec, 18 2017 10:37:37
- 0 Followers
- 1,072 Total Posts
- 45 Thanks
-
Jun 12, 20174
TheMasterCaver posted a message on What Are The Buggiest MineCraft Seeds Right Now ?Posted in: Seeds - To post a comment, please login.
1
Tree at the Advanced Survival spawn area
1
1
Update to the advanced span point
1
Spawn point in new Advanced World
1
1
IGN: RLS0812
1
Problem is, they will not let me do it, due to the Email address I used for my original account is now dead.
Any options, or do I have to wait for Mojang to one day disable all "legacy" accounts such as mine ?
1
Below is the XP farm that was built ... yields a very high amount of spiders.
( This is located on the http://www.myriadcraft.net server )
9
http://www.youtube.com/user/teamavolition#g/u
I have learned a lot on common and not-so common mistakes made by server owners / OP / Mods.
Good defenses to have:
*1 - Lockable and undestroyable chests are a must. Griefers use special xray mods to see chests regardless of were they are, and go after them first.
*2 - Anti fly detection in survival mode
*3 - Anti " fast mining " detection
*4 - Limit player actions to 2 per second. ( placing blocks & destroying blocks ). Advanced griefers use mass destruction / mass placement programs.
*5 - Good block logging - Being able to undo one person's actions is a must. There are ways around roll backs.
*6 - Disallow new folks to a server ( 60 days ) from using fire, lava, water, tnt, nd destroying other peoples blocks
*7 - Mcban - those that are serial griefers have many accounts, banning one just makes them log in using another one. The more accounts they are not allowed to use, the better.
*8 - White listing - griefing teams are very common, logging in and doing as much damage as possible in a short amount of time.
*9 - De-white listing - griefing teams are known to sign up to a white listed server long in advance of when they plan on attacking. Removing folks from a white list if they do not sign in at least once a week is recommended.
*10 - Zoning - Folks under x amount of days are not allowed to do anything outside of a certain area.
*11 - Update as often as possible. In one video aVo posted, they used a known exploit to gain mod rights, ruining the entire map, and crashing the server.
2