Y=140 is not high enough if you are relying on that trick. You need to go up to Y=200 for the base of your spawner, and you should preferably have Y=220 as the first layer of the actual spawner.
By building the spawner at Y=140, you have not moved far enough away to prevent mobs from spawning underground.
The game calculations are done on the server, but actual rendering is always done client side. Transporting an image 60+ times a second is way too much for most networks.
The server client does not transport images. It transports block IDs and coordinates, which your computer uses to construct the game image. The resource files are locally based, but the world save is based on the server machine.
The calculations done would normally be saved to the world files on your computer if you were playing single player, but for multiplayer, the server needs that data to transmit to other players. Your computer is responsible for your immediate actions (such as swinging your pickaxe to break a block). The server host is responsible for saving that data, and transmitting it to all players (including the person who actually breaks the block, which is why you can still see block lag for blocks you break yourself).
The host is generally responsible for all block updates. Water currents, redstone power states, mob movements (including other players), etc.
To answer the original question: yes, the server client will run some of the calculations that the local client would normally have to run in single player.
I do not know how this will behave in 1.3, when the game is being merged to just one client overall.
Why do I have to light up caves for slimes? Don't they have just as high spawn rate in light level 14 as in light level 0? Makes me believe that lighting up the surrounding caves don't have any effects as they will have just as high probability to spawn in my room as the caves.
Slimes have the same spawning cap that other hostile monsters do. By eliminating where other hostile mobs can spawn, you increase the chance of a slime spawning in your trap. Yes, they do have the same chance to spawn in light level 0 as well as light level 14.
Slimes also do despawn. Chances are, they spawn and despawn while you are not there. By standing in the room waiting for them to spawn, you are only utilizing a tiny corner of your room, as slimes (and all other hostile mobs) cannot naturally spawn within 24 blocks of you.
The only beta I ever played was 1.8 and I didn't actually own the game until a couple weeks before the full release. To make it worse I never started playing often until after the full release. So I have no idea what all the hype about beta and alpha worlds is. Any chance I could see some screenshots?
Beta was changing so rapidly around 1.8 and 1.9 that I couldn't really actively play a world as well. I had to keep restarting for new features, which I didn't enjoy.
Well, to get iron, I just find a cave system and explore it.
In order to get diamonds/redstone/gold/lapis, I dig a spiral staircase down to y: 12. I make a 3x3 tunnel for about 20 blocks, and then every 3 blocks (2 blocks in between each tunnel) I dig about 600-700 blocks in a straight line, just a 1x2 tunnel. If I run into lava, I turn it into obsidian (all of it) and move on. If I run into a cave, I light it up until it's obvious that the cave isn't going to stay at diamond level and go back, block the cave off, and continue mining.
With a fortune III pickaxe and another diamond pickaxe with high efficiency, I can usually get a stack of diamonds and at least 10 stacks of redstone in an hour or two.
If you are moving mobs around, then have them go down a block, and you can make them go up stairs or half slabs to go up.
If you are moving items, in 1.3, we will be able to get ice blocks. Simply place a sign after the last water current block, and then place a new water source after it (with ice under the water), and the items move fast enough to glide across that one block deadzone to get in the next current.
Adding onto what gtaylor stated: You can actually get away with no pistons or water flushing systems if you make the spawning pads smaller. I would recommend spawning pads that are smaller than 6x6. In my main survival world, I have a 1,300 spawning space mob grinder that relies on traditional water channels and 3x3 spawning pads and I can easily get 3,000 items in an hour (most of my local caves are also lit up).
You need to be within 30 blocks? I might check on that. I thought you couldn't be within 30.
Edit: Just checked, I can be within 30 blocks of it very easily. Is there a limit to how close you can be?
You need to be between 24-144 blocks away from it. The blocks that are 26-34 blocks away from the player tend to spawn mobs more frequently, but you can be outside of that range and still have them spawn. If you are ~40 blocks away from the spawner, then mobs will spawn, maybe move initially, and then stop moving altogether until you are closer to them or they despawn (which is why the 3x3 spawning pads are so nice).
Also, with only 128 spawning spaces, you are cutting it pretty thin. You want to aim to have around 1,000 spawning spaces, though 800 will work quite nicely as well.
1. You should have turned the chests sideways. With that many chests for every single block in the game, your storage room is too big.
2. Your ceiling is too dark. You need a lighter block or a higher ceiling overall. You could add fancy lamps to your ceiling, but it's too low currently. If you want to raise it, just mess around with upside down stairs to create a gradual increase.
My current survival world is my first world that I've actively played since I got the game, so naturally, I have the most diamonds right now (300 diamonds). I still don't know if I want to use diamond armor.
There's no reason to have an incinerator used for that. I've made incinerators before for automatic farms, which destroys items when I don't want to collect them and prevents lag, but I've never wanted a manual incinerator. There are no items that are useless. There's nothing that I would want to throw out.
It was like three MC days of work. Not a big deal. Both of us were laughing, and then my sister laughed at me even more when I said that the chest with my stuff in it got blown up (but not hers).
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By building the spawner at Y=140, you have not moved far enough away to prevent mobs from spawning underground.
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The server client does not transport images. It transports block IDs and coordinates, which your computer uses to construct the game image. The resource files are locally based, but the world save is based on the server machine.
The calculations done would normally be saved to the world files on your computer if you were playing single player, but for multiplayer, the server needs that data to transmit to other players. Your computer is responsible for your immediate actions (such as swinging your pickaxe to break a block). The server host is responsible for saving that data, and transmitting it to all players (including the person who actually breaks the block, which is why you can still see block lag for blocks you break yourself).
The host is generally responsible for all block updates. Water currents, redstone power states, mob movements (including other players), etc.
To answer the original question: yes, the server client will run some of the calculations that the local client would normally have to run in single player.
I do not know how this will behave in 1.3, when the game is being merged to just one client overall.
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Slimes have the same spawning cap that other hostile monsters do. By eliminating where other hostile mobs can spawn, you increase the chance of a slime spawning in your trap. Yes, they do have the same chance to spawn in light level 0 as well as light level 14.
Slimes also do despawn. Chances are, they spawn and despawn while you are not there. By standing in the room waiting for them to spawn, you are only utilizing a tiny corner of your room, as slimes (and all other hostile mobs) cannot naturally spawn within 24 blocks of you.
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Beta was changing so rapidly around 1.8 and 1.9 that I couldn't really actively play a world as well. I had to keep restarting for new features, which I didn't enjoy.
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Endermen farm too good.
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In order to get diamonds/redstone/gold/lapis, I dig a spiral staircase down to y: 12. I make a 3x3 tunnel for about 20 blocks, and then every 3 blocks (2 blocks in between each tunnel) I dig about 600-700 blocks in a straight line, just a 1x2 tunnel. If I run into lava, I turn it into obsidian (all of it) and move on. If I run into a cave, I light it up until it's obvious that the cave isn't going to stay at diamond level and go back, block the cave off, and continue mining.
With a fortune III pickaxe and another diamond pickaxe with high efficiency, I can usually get a stack of diamonds and at least 10 stacks of redstone in an hour or two.
EDIT: Also, welcome to the Minecraft Forums.
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If you are moving mobs around, then have them go down a block, and you can make them go up stairs or half slabs to go up.
If you are moving items, in 1.3, we will be able to get ice blocks. Simply place a sign after the last water current block, and then place a new water source after it (with ice under the water), and the items move fast enough to glide across that one block deadzone to get in the next current.
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You need to be between 24-144 blocks away from it. The blocks that are 26-34 blocks away from the player tend to spawn mobs more frequently, but you can be outside of that range and still have them spawn. If you are ~40 blocks away from the spawner, then mobs will spawn, maybe move initially, and then stop moving altogether until you are closer to them or they despawn (which is why the 3x3 spawning pads are so nice).
Also, with only 128 spawning spaces, you are cutting it pretty thin. You want to aim to have around 1,000 spawning spaces, though 800 will work quite nicely as well.
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Two gripes:
1. You should have turned the chests sideways. With that many chests for every single block in the game, your storage room is too big.
2. Your ceiling is too dark. You need a lighter block or a higher ceiling overall. You could add fancy lamps to your ceiling, but it's too low currently. If you want to raise it, just mess around with upside down stairs to create a gradual increase.
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It was like three MC days of work. Not a big deal. Both of us were laughing, and then my sister laughed at me even more when I said that the chest with my stuff in it got blown up (but not hers).