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added conventions header and DIR details

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VorTechnix 2021-08-01 10:37:13 -07:00
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Chat-Command-Reference.md
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@ -11,6 +11,22 @@ Other useful links:
**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.
## Conventions
Conventions for command syntax.
### DIR
WorldEditAdditions uses the `DIR` system in some of its selection modifier commands. `Dir`s are relative to the axis the player is facing and are defined as follows:
|Name|Definition|
|---|---|
`front`|The horizontal axis (X or Z) which the player is mostly facing toward and the multiplier (1 or -1) corresponding to whether the value of the player's position vector corresponding to that axis would increase or decrease if they moved in the direction they are facing.
`back`|Same axis as `front` but the multiplier is inverted (m * -1).
`left`|The horizontal axis (X or Z) perpendicular to the player with the opposite multiplier to `front` if the front axis is Z or the same multiplier as `front` if the front axis is X.
`right`|Same axis as `left` but the multiplier is inverted (m * -1).
`up`|The Y axis with the multiplier 1.
`down`|The Y axis with the multiplier -1.
## `//floodfill [<replace_node> [<radius>]]`
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).
@ -373,6 +389,7 @@ The above functions just like `//replace` - nothing special going on here. It re
Let's make it more interesting:
```weacmd
@ -709,6 +726,7 @@ Short for _select point cloud_. Sets pos1 and pos2 to include the nodes you punc
```
## `//scentre`
Short for _select center_. Sets pos1 and pos2 to the centre point(s) of the current selection area. 1, 2, 4 or 8 nodes may be selected depending on what parts of the original selection are even in distance. Implementation thanks to @VorTechnix.