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//noiseapply2d: document

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Starbeamrainbowlabs 2021-08-07 23:10:40 +01:00
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Chat-Command-Reference.md
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@ -505,7 +505,7 @@ Applies 2D noise to the terrain in the defined region. Like `//erode`, this comm
Parameter | Type | Default Value | Description
------------|-----------|---------------|-----------------------
algorithm | `string` | perlin | The 2D noise algorithm to apply - see below.
algorithm | `string` | perlinmt | The 2D noise algorithm to apply - see below.
apply | `string|integer` | 5 | How to apply the noise to the terrain - see below.
scalex | `float` | 1 | The scale of the noise on the x axis.
scaley | `float` | 1 | The scale of the noise on the y axis.
@ -528,7 +528,8 @@ The following algorithms are currently available:
Algorithm | Description
------------|--------------------------
`perlin` | Perlin noise. Functional, but currently contains artefacts I'm having difficulty tracking down.
`perlinmt` | **Default**.Perlin noise, backed by Minetest's inbuilt `PerlinNoise` class.
`perlin` | Perlin noise, backed by a pure Lua perlin noise implementation. Functional, but currently contains artefacts I'm having difficulty tracking down.
`sin` | A sine wave created with `math.sin()`.
`white` | Random white noise.
`red` | Red noise - has a lower frequency than white noise. Ref [Noise Functions and Map Generation by Red Blob Games](https://www.redblobgames.com/articles/noise/introduction.html).
@ -654,6 +655,21 @@ As with `//ellipsoidapply` for advanced users `//multi` is also supported - but
```
## `//noiseapply2d <threshold> <scale> <command_name> <args>`
Like [`//ellipsoidapply`](#ellipsoidapply), but instead only keeps changes where a noise function (defaults to `perlinmt`, see [`//noise2d`](#noise2d)) returns a value greater than a given threshold value.
Also takes a scale value that controls the scale of the noise - -higher values result in smaller "blobs". If you're operating on small areas, then a value of at least 10 is advised as "blobs" are by default on the scale of ~50 nodes.
As with `//ellipsoidapply` for advanced users `//multi` is also supported - but make sure your modifications stay within the defined region - otherwise they be kept regardless, as `//noiseapply2d` only applies the masking to the nodes in the defined region.
Any suggestions on how to provide more customisability without making this command more difficult to use or significantly more inconsistent with other `//*apply` functions are welcome - please [open an issue](https://github.com/sbrl/Minetest-WorldEditAdditions/issues/new).
```weacmd
//noiseapply2d 0.5 10 set dirt
//noiseapply2d 0.4 3 layers dirt_with_snow dirt 3 stone 10
```
## `//scol [<axis1> ] <length>`
Short for _select column_. Sets the pos2 at a set distance along 1 axis from pos1. If the axis isn't specified, defaults the direction you are facing. Implementation thanks to @VorTechnix.

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README.md
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@ -49,6 +49,7 @@ The detailed explanations have moved! Check them out [here](https://github.com/s
- [`//fillcaves [<node_name>]`](https://worldeditadditions.mooncarrot.space/Reference/#fillcaves)
- [`//convolve <kernel> [<width>[,<height>]] [<sigma>]`](https://worldeditadditions.mooncarrot.space/Reference/#convolve)
- [`//erode [<snowballs|river> [<key_1> [<value_1>]] [<key_2> [<value_2>]] ...]`](https://worldeditadditions.mooncarrot.space/Reference/#erode) **experimental**
- [`//noise2d [<key_1> [<value_1>]] [<key_2> [<value_2>]] ...]`](https://worldeditadditions.mooncarrot.space/Reference/#noise2d)
### Flora
- [`//bonemeal [<strength> [<chance>]]`](https://github.com/sbrl/Minetest-WorldEditAdditions/blob/main/Chat-Command-Reference.md#bonemeal-strength-chance)
@ -82,7 +83,7 @@ The detailed explanations have moved! Check them out [here](https://github.com/s
- [`//subdivide <size_x> <size_y> <size_z> <cmd_name> <args>`](https://worldeditadditions.mooncarrot.space/Reference/#subdivide)
- [`//ellipsoidapply <command_name> <args>`](https://worldeditadditions.mooncarrot.space/Reference/#ellipsoidapply) _(new in v1.9)_
- [`//airapply <command_name> <args>`](https://worldeditadditions.mooncarrot.space/Reference/#airapply) _(new in v1.9)_
- [`//noiseapply2d <command_name> <args>`](https://worldeditadditions.mooncarrot.space/Reference/#noiseapply2d) _(new in v1.13)_
- [`//noiseapply2d <threshold> <scale> <command_name> <args>`](https://worldeditadditions.mooncarrot.space/Reference/#noiseapply2d) _(new in v1.13)_
### Extras
- [`//y`](https://github.com/sbrl/Minetest-WorldEditAdditions/blob/main/Chat-Command-Reference.md#y)