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reference: add //spline

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Starbeamrainbowlabs 2022-09-25 23:02:18 +01:00
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@ -189,6 +189,21 @@ If `h` or `hollow` is specified at the end, then the resulting dome shape is mad
```
### `//spline <replace_node> <width_start> [<width_end=width_start> [<steps=3>]]`
Draws a curved line, using all the currently defined points as control points. The starting and ending widths of the line can be controlled, and the width will be linearly interpolated.
**Note:** `//spline` uses the **new** WorldEditAdditions positions! Use the [multipoint wand](#multi-point-wand) to define the control points for the resulting line.
For those interested, WorldEditAdditions uses the [chaikin curve algorithm](https://starbeamrainbowlabs.com/blog/article.php?article=posts/196-Chaikin-Curve-Generator.html) to draw the curve.
```weacmd
//spline dirt 5 2
//spline glass 3
//spline bakedclay:violet 3
```
![An example of what //spline can do.](https://raw.githubusercontent.com/sbrl/Minetest-WorldEditAdditions/main/.docs/images/reference/spline.jpeg)
## Misc
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@ -523,7 +538,7 @@ 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).
`river` | 2D | Fills in potholes and lowers pillars using a cellular automata-like algorithm that analyses the height of neighouring columns.
`river` | 2D | Fills in potholes and lowers pillars using a cellular automata-like algorithm that analyses the height of neighbouring columns.
Usage examples:
@ -609,7 +624,7 @@ The following algorithms are currently available:
Algorithm | Description
------------|--------------------------
`perlinmt` | **Default**.Perlin noise, backed by Minetest's inbuilt `PerlinNoise` class.
`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.