This is the full chat command reference for WorldEditAdditions. Having trouble finding the section you want? Try the **[quick reference](https://github.com/sbrl/Minetest-WorldEditAdditions#quick-command-reference)** instead, which has links to back to sections of this document!
**Note:** If anything in this reference isn't clear, that's a bug. Please [open an issue](https://github.com/sbrl/Minetest-WorldEditAdditions/issues/new) (or even better a PR improving it) to let me know precisely which bit you don't understand and why.
Floods all connected nodes of the same type starting at _pos1_ with <replace_node> (which defaults to `water_source`), in a sphere with a radius of <radius> (which defaults to 50).
Places `<node_name_a>` in the last contiguous air space encountered above the first non-air node. In other words, overlays all top-most nodes in the specified area with `<node_name_a>`. Optionally supports a mix of node names and chances, as `//mix` (WorldEdit) and `//replacemix` (WorldEditAdditions) does.
Will also work in caves, as it scans columns of nodes from top to bottom, skipping every non-air node until it finds one - and only then will it start searching for a node to place the target node on top of.
Note that all-air columns are skipped - so if you experience issues with it not overlaying correctly, try `//expand down 1` to add an extra node's space to your defined region.
Note also that columns without any air nodes in them at all are also skipped, so try `//expand y 1` to add an extra layer to your defined region.
Finds the first non-air node in each column and works downwards, replacing non-air nodes with a defined list of nodes in sequence. Like WorldEdit for Minecraft's `//naturalize` command, and also similar to [`we_env`'s `//populate`](https://github.com/sfan5/we_env). Speaking of, this command has `//naturalise` and `//naturalize` as aliases. Defaults to 1 layer of grass followed by 3 layers of dirt.
The list of nodes has a form similar to that of a chance list you might find in `//replacemix`, `//overlay`, or `//mix` - see the examples below. If the numberr of layers isn't specified, `1` is assumed (i.e. a single layer).
Plants and grows saplings to generate a forest. A density value is optionally taken, which controls the overall density of the forest that is generated. The `bonemeal` mod is required - just like for the [`//bonemeal`](#bonemeal-strength-chance) command.
The density defaults to 1, acts like a multiplier, and is not affected by the chances of all saplings listed (e.g. you can have a sapling with a chance of 1-in-50, and the overall density of the forest will be unaffected). For example, 2 results in a forest twice as dense as the default, and 0.5 a forest half as dense as the default density.
The tree types are provided as a list of names and 1-in-N chances, just like [`//overlay`](#overlay-node_name_a-chance_a-node_name_b-chance_b-node_name_n-chance_n-), `//mix`, `//layers`, etc. Unlike the aforementioned commands however, `//forest` has an additional layer of alias resolution to ease the process of determining what the name of the sapling is you want to use to generate forests with. See [`//saplingaliases`](#saplingaliases-aliasesall_saplings) for more details.
Saplings are placed with [`//overlay`](#overlay-node_name_a-chance_a-node_name_b-chance_b-node_name_n-chance_n-) and grown using the same method that's used by the `//bonemeal` command. Up to 100 attempts are made to grow placed saplings. If all of those attempts fail (success is determined by whether the sapling is still present or not), the sapling is removed and the failure counter is incremented.
Currently, the following mods are known to have aliases registered:
- [`moretrees`](https://content.minetest.net/packages/VanessaE/moretrees/) (warning: these saplings don't appear to work very well this command - assistance in debugging this would be very helpful)
Fills in all airlike nodes beneath non airlike nodes, which gives the effect of filling in caves. Defaults to filling in with stone, but this can be customised.
Creates a solid torus at position 1 with the specified major and minor radii. The major radius is the distance from the centre of the torus to the centre of the circle bit, and the minor radius is the radius of the circle bit.
The radius can be thought of as the thickness of the line, and is defined as the distance from a given node to an imaginary line from pos1 to pos2. Defaults to drawing with dirt and a radius of 1.
Replaces nodes inside the defined region with air, but leaving a given number of nodes near the outermost edges alone. In other words, it makes the defined region hollow, while leaving walls around the edges of a given thickness (defaulting to a wall thickness of 1).
Generates a maze using replace_node as the walls and air as the paths. Uses [an algorithm of my own devising](https://starbeamrainbowlabs.com/blog/article.php?article=posts/070-Language-Review-Lua.html) (see also [this post of mine that has lots of eye candy :D](https://starbeamrainbowlabs.com/blog/article.php?article=posts/429-lua-blender-mazes.html)). It is guaranteed that you can get from every point to every other point in generated mazes, and there are no loops.
The optional `path_length` and `path_width` arguments require additional explanation. When generating a maze, a multi-headed random walk is performed. When the generator decides to move forwards from a point, it does so `path_length` nodes at a time. `path_length` defaults to `2`.
`path_width` is easier to explain. It defaults to `1`, and is basically the number of nodes wide the path generated is.
Note that `path_width` must always be at least 1 less than the `path_length` in order to operate normally.
Note also that since WorldEditAdditions v1.10, the seed doesn't have to be a number (but it can't contain spaces due to the parsing algorithm used). Non-numbers are hashed to a number using a simple (non-crypto-safe) hashing algorithm.
Same as `//maze`, but adapted for 3d - has all the same properties. Note that currently there's no way to adjust the height of the passageways generated (you'll need to scale the generated maze afterwards).
Requires the [`bonemeal`](https://content.minetest.net/packages/TenPlus1/bonemeal/) ([repo](https://notabug.org/TenPlus1/bonemeal/)) mod (otherwise _WorldEditAdditions_ will not register this command and output a message to the server log). Alias: `//flora`.
Bonemeals all eligible nodes in the current region. An eligible node is one that has an air node directly above it - note that just because a node is eligible doesn't mean to say that something will actually happen when the `bonemeal` mod bonemeals it.
Optionally takes a strength value (that's passed to `bonemeal:on_use()`, the method in the `bonemeal` mod that is called to actually do the bonemealing). The strength value is a positive integer from 1 to 4 (i.e. 1, 2, 3, or 4) - the default is 1 (the lowest strength).
I observe that a higher strength value gives a higher chance that something will actually grow. In the case of soil or sand nodes, I observe that it increases the area of effect of a single bonemeal action (thus at higher strengths generally you'll probably want a higher chance number - see below). See the [`bonemeal` mod README](https://notabug.org/TenPlus1/bonemeal) for more information.
Also optionally takes a chance number. This is the chance that an eligible node will actually get bonemealed, and is a positive integer that defaults to 1. The chance number represents a 1-in-{number} chance to bonemeal any given eligible node, where {number} is the chance number. In other words, the higher the chance number the lower the chance that a node will be bonemealed.
For example, a chance number of 2 would mean a 50% chance that any given eligible node will get bonemealed. A chance number of 16 would be a 6.25% chance, and a chance number of 25 would be 2%.
Advanced version of [`//stretch` from WorldEdit](https://github.com/Uberi/Minetest-WorldEdit/blob/master/ChatCommands.md#stretch-stretchx-stretchy-stretchz) that can scale both up and down at the same time by transparently splitting it into 2 different operations. Scaling up is *always* done before scaling down.
Although the syntax looks complicated, it's really quite simple. The key concept to understand is that of the scale factor. It refers to how much the defined region should be scaled up or down by, and can be specified in multiple different ways:
Scale Factor | Meaning
----------------|---------------------
1 | Don't scale at all.
0.5 | Scale down by 50%
2 | Scale up by 2x, doubling the size
5 | Scale up by 5x, quintupling the size
20% | Scale down to 30% of the original size
1/3 | Scale down to 1 third of original size
In short, you can specify the scale factor directly, as a percentage, or as 1 number divided by another number.
**Note:** `//scale` always scales in the _positive direction_ by default. This can be changed however - see below.
With this in mind, there are 3 forms that you can tell `//scale` how you want to scale the defined region:
### Single Axis
If you just need to scale a single axis, you can tell `//scale` that like so:
```
//scale <axis><scale_factor>
```
To give a concrete example:
```
//scale y 2
```
The above will scale the defined region in the positive y direction by 2 times, doubling the height. If you want to scale in the opposite direction, do this:
```
//scale -y 2
```
This will scale in the _negative_ y direction by 2 times (again, doubling the height). Some more examples:
```
//scale z 50%
//scale -x 1/3
```
### All axes
To scale on all axes at once, `//scale` takes the shortcut syntax of specifying a single scale factor:
```
//scale 2
//scale 200%
```
Both of the above will scale the defined region up by 2 times in all directions.
### Multiple scale factors
If you want to specify different scale factors for difference axes, then `//scale` also supports a third syntax. Here's an example:
```
//scale 2 3 4
```
This will scale the defined region by 2x in the positive x, 3x in the positive y, and 4x in the positive z. As these are all scale factors, we can also use the syntax described above to scale up and down in the same operation:
```
//scale 50% 2 1/4
```
This will first scale in the positive y by 2x. Once that operation is completed, it will scale down to 50% size in the positive x and down to 25% size in the positive z. Note that if you want to scale down first and then scale up, you'll need to execute 2 separate commands.
If you want to change the anchor point of the scaling operation too, `//scale` supports a final syntax like so:
```
//scale 50% 2 1/4 1 -1 1
```
By adding 3 extra numbers for the x, y, and z axes respectively, we can control the direction `//scale` performs the scaling operation. A value of 1 or greater indicates the positive direction of the axis, and a value of -1 or less indicates the negative direction of the axis. I recommend by [worldedit_hud_helper](https://content.minetest.net/packages/Starbeamrainbowlabs/worldedit_hud_helper/) mod for easily determining which direction is which.
So in the above example, we scale in the positive x and z directions, and the negative y direction.
Replaces a given node with a random mix of other nodes. Functions like `//mix`.
This command is best explained with examples:
```
//replacemix dirt stone
```
The above functions just like `//replace` - nothing special going on here. It replaces all `dirt` nodes with `stone`.
Let's make it more interesting:
```
//replacemix dirt 5 stone
```
The above replaces 1 in every 5 `dirt` nodes with `stone`. Let's get even fancier:
```
//replacemix stone stone_with_diamond stone_with_gold
```
The above replaces `stone` nodes with a random mix of `stone_with_diamond` and `stone_with_gold` nodes. But wait - there's more!
```
//replacemix stone stone_with_diamond stone_with_gold 4
```
The above replaces `stone` nodes with a random mix of `stone_with_diamond` and `stone_with_gold` nodes as before, but this time in the ratio 1:4 (i.e. for every `stone_with_diamond` node there will be 4 `stone_with_gold` nodes). Note that the `1` for `stone_with_diamond` is implicit there.
If we wanted to put all of the above features together into a single command, then we might do this:
Advanced version of `//smooth` from we_env, and one of the few WorldEditAdditions commands to have any aliases (`//smoothadv` and `//conv`).
Extracts a heightmap from the defined region and then proceeds to [convolve](https://en.wikipedia.org/wiki/Kernel_(image_processing)) over it with the specified kernel. The kernel can be thought of as the filter that will be applied to the heightmap. Once done, the newly convolved heightmap is applied to the terrain.
Possible kernels:
Kernel | Description
----------------|------------------------------
[`box`](https://en.wikipedia.org/wiki/Box_blur) | A simple uniform box blur.
`pascal` | A kernel derived from the odd layers of [Pascal's Triangle](https://en.wikipedia.org/wiki/Pascal%27s_triangle). Slightly less smooth than a Gaussian blur.
[`gaussian`](https://en.wikipedia.org/wiki/Gaussian_blur) | The default. A Gaussian blur - should give the smoothest result, and also the most customisable - see below.
If you can think of any other convolutional filters that would be useful, please [open an issue](https://github.com/sbrl/Minetest-WorldEditAdditions/issues/new). The code backing this command is very powerful and flexible, so adding additional convolutional filters should be pretty trivial.
The width and height (if specified) refer to the dimensions of the kernel and must be odd integers and are separated by a single comma (and _no_ space). If the height is not specified, it defaults to the width. If using the `gaussian` kernel, the width and height must be identical. Larger kernels are slower, but produce a more smoothed effect and take more nearby nodes into account for every column. Defaults to a 5x5 kernel.
The sigma value is only applicable to the `gaussian` kernel, and can be thought of as the 'smoothness' to apply. Greater values result in more smoothing. Default: 2. See the [Gaussian blur](https://en.wikipedia.org/wiki/Gaussian_blur) page on Wikipedia for some pictures showing the effect of the sigma value.
Runs an erosion algorithm over the defined region, optionally passing a number of key - value pairs representing parameters that are passed to the chosen algorithm. This command is **experimental**, as the author is currently on-the-fence about the effects it produces.
Currently implemented algorithms:
Algorithm | Mode | Description
------------|-------|-------------------
`snowballs` | 2D | The default - based on [this blog post](https://jobtalle.com/simulating_hydraulic_erosion.html). Simulates snowballs rolling across the terrain, eroding & depositing material. Then runs a 3x3 gaussian kernel over the result (i.e. like the `//conv` / `//smoothadv` command).
Usage examples:
```
//erode
//erode snowballs
//erode snowballs count 25000
```
Each of the algorithms above have 1 or more parameters that they support. These are detailed below.
Based on the algorithm detailed in [this blog post](https://jobtalle.com/simulating_hydraulic_erosion.html) ([direct link to the source code](https://github.com/jobtalle/HydraulicErosion/blob/master/js/archipelago/island/terrain/erosionHydraulic.js)), devised by [Job Talle](https://jobtalle.com/).
rate_deposit | `float` | 0.03 | The rate at which snowballs will deposit material
rate_erosion | `float` | 0.04 | The rate at which snowballs will erode material
friction | `float` | 0.07 | More friction slows snowballs down more.
speed | `float` | 1 | Speed multiplier to apply to snowballs at each step.
max_steps | `float` | 80 | The maximum number of steps to simulate each snowball for.
velocity_hist_count | `float` | 3 | The number of previous history values to average when detecting whether a snowball has stopped or not
init_velocity | `float` | 0.25 | The maximum random initial velocity of a snowball for each component of the velocity vector.
scale_iterations | `float` | 0.04 | How much to scale erosion by as time goes on. Higher values mean that any given snowball will erode more later on as more steps pass.
maxdiff | `float` | 0.4 | The maximum difference in height (between 0 and 1) that is acceptable as a percentage of the defined region's height.
count | `float` | 25000 | The number of snowballs to simulate.
noconv | any | n/a | When set to any value, disables to automatic 3x3 gaussian convolution.
If you find any good combinations of these parameters, please [open an issue](https://github.com/sbrl/Minetest-WorldEditAdditions/issues/new) (or a PR!) and let me know! I'll include good combinations here, and possibly add a presets feature too.
Counts all the nodes in the defined region and returns the result along with calculated percentages (note that if the chat window used a monospace font, the returned result would be a perfect table. If someone has a ~~hack~~ solution to make the columns line up neatly, please [open an issue](https://github.com/sbrl/Minetest-WorldEditAdditions/issues/new) :D)
Splits the current WorldEdit region into `(<size_x>, <size_y>, <size_z>)` sized chunks, and run `//<cmd_name> <args>` over each chunk.
Sometimes, we want to run a single command on a truly vast area. Usually, this results in running out of memory. If this was you, then this command is just what you need! It should be able to handle any sized region - the only limit is your patience for command to complete.....
Note that this command only works with WorldEdit commands, and only those which require 2 points (e.g. `//torus` only requires a single point, so it wouldn't work very well - but `//set` or `//clearcut` would).
Note also that `<cmd_name>` should _not_ be prefixed with _any_ forward slashes - see the examples below.
While other server commands can be executed while a `//subdivide` is running, `//subdivide` manipulates your player's defined region when running. This has the side-effect that you can check on where it has got up to with `//p get` for example - but means that attempting to change your pos1 & pos2 manually will have no effect until the `//subdivide` completes.
**Warning:** Once started, this command cannot be stopped without restarting your server! This is the case with all WorldEdit commands, but it's worth a special mention here.
Executes a single chat command many times in a row. Uses `minetest.after()` to yield to the main server thread to allow other things to happen at the same time, so technically you could have multiple `//many` calls going at once (but multithreading support is out of reach, so only a single one will be executing at the same time).
Note that this isn't necessarily limited to executing WorldEdit / WorldEditAdditions commands. Combine with `//multi` (see above) execute multiple commands at once for even more power and flexibility!
Executes the given command, and then clips the result to the largest ellipsoid that will fit inside the defined region. The specified command must obviously take 2 positions - so for example `//set`, `//replacemix`, and `//maze3d` will work, but `//sphere`, `//torus`, and `//floodfill` won't.
Short for _select rectangle_. Sets the pos2 at a set distance along 2 axes from pos1. If the axes aren't specified, defaults to positive y and the direction you are facing. Implementation thanks to @VorTechnix.
Confirms the execution of a command if it could potentially affect a large number of nodes and take a while. This is a regular WorldEdit command.
<!-- Equivalent to_WorldEdit_'s `//y`, but because of security sandboxing issues it's not really possible to hook into WorldEdit's existing command. -->
Prevents the execution of a command if it could potentially affect a large number of nodes and take a while. This is a regular WorldEdit command.
<!-- Equivalent to_WorldEdit_'s `//y`, but because of security sandboxing issues it's not really possible to hook into WorldEdit's existing command. -->
The far wand (`worldeditadditions:farwand`) is a variant on the traditional WorldEdit wand (`worldedit:wand`). It looks like this: 
It functions very similarly to the regular WorldEdit wand, except that it has a _much_ longer range - which can be very useful for working on large-scale terrain for example. It also comes with an associated command to control it.
This command helps control the behaviour of the [WorldEditAdditions far wand](#far-wand). Calling it without any arguments shows the current status:
```
//farwand
```
You can decide whether you can select liquids or not like so:
```
//farwand skip_liquid true
//farwand skip_liquid false
```
You can change the maximum range with the `maxdist` subcommand:
```
//farwand maxdist 1000
//farwand maxdist 200
//farwand maxdist 9999
```
Note that the number there isn't in blocks (because hard maths). It is however proportional to the distance the wand will raycast looks for nodes, so a higher value will result in it raycasting further.
The cloud wand (`worldeditadditions:cloudwand`) is a another variant the above _Far Wand_. It looks like this: 
Unlike the other 2 wands, this wand functions in an additive manner. Left-click on a node to expand the currently defined region (creating a new one if one isn't defined already) to include that node. Right click to clear the currently defined region.
It has the range of the _Far Wand_ mentioned above too, so you can select nodes from a great distance. It also abides by preferences set via the `//farwand` chat command.
