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Update changelog & document //erode in the README

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Starbeamrainbowlabs 2020-08-21 21:26:29 +01:00
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3 changed files with 41 additions and 2 deletions
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1
CHANGELOG.md
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@ -4,6 +4,7 @@ It's about time I started a changelog! This will serve from now on as the master
## v1.9 (unreleased)
- Add `//many` for executing a command many times in a row
- Add **experimental** `//erode` command
## v1.8: The Quality of Life Update (17th July 2020)

40
README.md
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@ -27,6 +27,7 @@ If you can dream of it, it probably belongs here!
- [`//overlay <node_name_a> [<chance_a>] <node_name_b> [<chance_b>] [<node_name_N> [<chance_N>]] ...`](#overlay-node_name_a-chance_a-node_name_b-chance_b-node_name_n-chance_n-)
- [`//layers [<node_name_1> [<layer_count_1>]] [<node_name_2> [<layer_count_2>]] ...`](#layers-node_name_1-layer_count_1-node_name_2-layer_count_2-)
- [`//convolve <kernel> [<width>[,<height>]] [<sigma>]`](#convolve-kernel-widthheight-sigma)
- [`//erode [<snowballs|...> [<key_1> [<vaue_1>]] [<key_2> [<value_2>]] ...]`](#) **experimental**
### Statistics
- [`//count`](#count)
@ -53,7 +54,7 @@ Floods all connected nodes of the same type starting at _pos1_ with <replace_nod
//floodfill glass 25
```
### `//overlay <node_name_a> [<chance_a>] <node_name_b> [<chance_b>] [<node_name_N> [<chance_N>]] ...`
### `//overlay <node_name_a> [<chance[<snowballs|...> [<key_1> [<vaue_1>]] [<key_2> [<value_2>]] ...]_a>] <node_name_b> [<chance_b>] [<node_name_N> [<chance_N>]] ...`
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.
@ -256,6 +257,43 @@ The sigma value is only applicable to the `gaussian` kernel, and can be thought
//convolve gaussian 5 0.2
```
## `//erode [<snowballs|...> [<key_1> [<vaue_1>]] [<key_2> [<value_2>]] ...]`
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. 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.
### Parameters: snowballs
Parameter | Type | Default Value | Description
--------------------|-----------|-------------------|------------------------
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` | 50000 | The number of snowballs to simulate.
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.
### `//count`
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)

2
worldeditadditions_commands/commands/erode.lua
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@ -5,7 +5,7 @@
-- ███████ ██ ██ ██████ ██████ ███████
worldedit.register_command("erode", {
params = "[<snowballs|...> [<key_1> [<vaue_1>]] [<key_2> [<value_2>]] ...]",
description = "Runs the specified erosion algorithm over the given defined region. This may occur in 2d or 3d. Currently implemented algorithms: snowballs (default;2d hydraulic-like). Also optionally takes an arbitrary set of key - value pairs representing parameters to pass to the algorithm. See the full documentation for details.",
description = "**experimental** Runs the specified erosion algorithm over the given defined region. This may occur in 2d or 3d. Currently implemented algorithms: snowballs (default;2d hydraulic-like). Also optionally takes an arbitrary set of key - value pairs representing parameters to pass to the algorithm. See the full documentation for details.",
privs = { worldedit = true },
require_pos = 2,
parse = function(params_text)