Infinite Maps

[Jordach]

To be precise.

When you're near the center (even a couple thousand meters from it), the game renders fine within previously-documented limits. However, get really far from the center on both X and Z axes, say 30000m or so, and blocks start exhibiting severe rendering glitches. Edges dance around and/or disappear into neighboring edges, signs and other 2d objects flicker in and out of existence, etc. See this video for an example:

http://youtu.be/wBDPPJ6t0wA

Low framerate aside, this is typical of what I'm experiencing.

This is related to the map size, I once tested 62000 as the top limit, not 31000 - the entire textures and blocks vanished, thus meaning endless maps can't be done...

But they can. with that modification to the source, the map generate fine up until 32700/32600 (varies) then it will either crash or stop rendering the textures. (Actually, both can happen, it can also crash before this no render section pf the map.)

The crash I aforementioned is actually the co-ordinates, beyond their maxium variable number off 65535 or similar, thus meaning this variable; v3s16 must be changed into a long "signed" integer.

[irksomeduck]

Aren't maps pretty much infinite anyway? I think they are big enough anyway.

[Jordach]

Na, what if a server has been running for almost 4 years, that map "must" be exhausted.

[irksomeduck]

My idea would be to build an underground civilisation or something. Encourage people to move underground. I mean if you mine a huge cavern out and but dirt on the bottom, that way people could farm, grow trees ect. I lived very deep underground at one point, and it is worth it if you can get enough saplings, food ecy. Of course you would need lots of buckets of water, but I would recommend trying it out.

[CTMN]

Lots of buckets of water? Never played around with water?

U only need 2 buckets. Place them like this:

~ is water
[] is a hole that u have to dig after u placed the water

~[]
~

Then u have infinite water and can take it out of the hole. It will be refilled automatically.

[srothe]

Doesn't work for me. Could you please explain the procedure a bit more for dummies?

~[]
~ <--Is this a profile view or a map view?

Cheers, Stefan

[PilzAdam]

Doesn't work for me. Could you please explain the procedure a bit more for dummies?

~[]
~ <--Is this a profile view or a map view?

Cheers, Stefan

Its from above.

[Topywo]

Doesn't work for me. Could you please explain the procedure a bit more for dummies?

~[]
~ <--Is this a profile view or a map view?

Cheers, Stefan

There's a difference between water/lava_source and water/lava_flowing.

You can fill a bucket with a source, not with flowing. Right-click when you have a filled bucket in your hand to empty it (=placing the source-node)

Whenever you place 2 sources of the same kind (water or lava) with exactly 1 empty block between them, the empty block will fill itself. You might expect flowing water/lava, but in minetest the empty block will fill and turn into a source. This means you can take it with a bucket.

When you take the source that has been created like that, you create a new empty block. This will fill up again and turn into a source, thus becoming takeable again. Etc., etc.. therefore it's called infinite.

p.s. when you take away one of the two outer sources, thus creating an empty block, it will be filled with 'real' flowing water/lava, and not be takeable.

[srothe]

Ok, now I see how it works. But the initial explanation was wrong or incomplete in two points.

1. You need to create a basin around your intended fountain:

X X X X
X X O X X: Sand, Gravel, Rock, Wood, etc
X O O X O: Empty
X X X X

Otherwise, placing the two bucketloads of water would cause a flooding :-)

2. Now You first need to dig the hole in the ground, then you empty your buckets next to it

X X X X X: Sand, Gravel, Rock, Wood, etc
X X W X W: Water
X W[] X []: Hole
X X X X

If you place the water first, digging the hole has no effect. If you first dig the hole, it indeed refills on taking out water.

3. You may want to cover the two sources by rock etc, to prevent them from being bucketed by accident. Some green and a lantern for decoration, and here I got my personal fountain of youth :-)



Cheers, Stefan

[Jordach]

Back to on topic, as soon as I can find this among the code:

Code: Select all

short int v3s16

And change it to a long signed variable, this means we will have a truly endless map downwards!

Short signed: -32768 to 32767

Long signed: -2147483648 to 2147483647

Source: http://www.cplusplus.com/files/tutorial.pdf Page 12

[CTMN]

@srothe: 1. U can't make holes in the air. And beside, the "hole in the air" would still be filled. ;-)

2. It doesn't matter if u dig the hole in the middle first or if u dig the hole as last. U probably had a lag.

3. It works without that.

@Jordach: Celeron also could make an UNSIGNED long and a bool or short as the negative flag or a long double and do as if the blocks were 0.1 metre(or whatever) high. I'm not sure if he is using integers right now(if u press F5, it sometimes says there "X,0.5,Y" or so).

[SegFault22]

Back to on topic, as soon as I can find this among the code:

Code: Select all

short int v3s16

And change it to a long signed variable, this means we will have a truly endless map downwards!

Short signed: -32768 to 32767

Long signed: -2147483648 to 2147483647

Source: http://www.cplusplus.com/files/tutorial.pdf Page 12

+1
Can you try to test this and see what happens with it?

[Jordach]

Do I look like I am going to search out one single damn line?

That's like Santa Claus NOT delivering presents.

[CTMN]

SegFault, write to Celeron, not to Jordach

[MasterGollum]

If you do it, we will not finish the map in our lifetime it will be more than 10 times the distance from the Earth to the Moon! If I calculated well, starting from the center of the map at 3 m/s speed as the AV moves in my screen, we will need about 23 years walking without stop to reach the end of the map Who will be the first to arrive? I support this change it is a great idea, the current 32Km size is limiting.

But I think it will require more changes than just "1 line of code", all the places were the coordinates are being used will requires to be changed to 4bytes (long), or it will crash. For example the variables of the lua scripts (if they are not already been stored in 4bytes).

[PilzAdam]

If you do it, we will not finish the map in our lifetime it will be more than 10 times the distance from the Earth to the Moon! If I calculated well, starting from the center of the map at 3 m/s speed as the AV moves in my screen, we will need about 23 years walking without stop to reach the end of the map Who will be the first to arrive? I support this change it is a great idea, the current 32Km size is limiting.

But I think it will require more changes than just "1 line of code", all the places were the coordinates are being used will requires to be changed to 4bytes (long), or it will crash. For example the variables of the lua scripts (if they are not already been stored in 4bytes).

Its 2.7777 days with the current map limits.

[Dragonop]

srothe wrote:
Doesn't work for me. Could you please explain the procedure a bit more for dummies?
~[]
~ <--Is this a profile view or a map view?
Cheers, Stefan

BECAUSE IT NEEDS TO BE LIKE THIS
~[]
[]~ and now you can take from everywere

[rubenwardy]

You could use find to look for short ints

[Calinou]

If I calculated well, starting from the center of the map at 3 m/s speed as the AV moves in my screen.

Walking speed is 4 blocks/second (1 block is one cubic meter), sneaking speed is 1 + 1/3 blocks/second.

[jordan4ibanez]

This would be a fucking problem. If maps were generated ∞ then there would be ∞ ores and no stone past 31500.

[rarkenin]

Back to on topic, as soon as I can find this among the code:

Code: Select all

short int v3s16

And change it to a long signed variable, this means we will have a truly endless map downwards!

Short signed: -32768 to 32767

Long signed: -2147483648 to 2147483647

Source: http://www.cplusplus.com/files/tutorial.pdf Page 12

+1
Can you try to test this and see what happens with it?

This would involve changing the serialization formats of PointedThing and MapNode, as well as countless other data structures and communication packets.