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Expose getPointedThing to Lua

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This commit introduces Raycast, a Lua user object, which can be
used to perform a raycast on the map. The ray is continuable, so one can
also get hidden nodes (for example to see trough glass).
This commit is contained in:
Dániel Juhász 2016-07-23 21:11:20 +02:00 • committed by paramat
parent a80ecbee1e
commit 3caad3f3c9
25 changed files with 671 additions and 313 deletions
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26
doc/lua_api.txt
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@ -2557,6 +2557,12 @@ and `minetest.auth_reload` call the authetification handler.
* `pos2`: Second position
* `stepsize`: smaller gives more accurate results but requires more computing
time. Default is `1`.
* `minetest.raycast(pos1, pos2, objects, liquids)`: returns `Raycast`
* Creates a `Raycast` object.
* `pos1`: start of the ray
* `pos2`: end of the ray
* `objects` : if false, only nodes will be returned. Default is `true`.
* `liquids' : if false, liquid nodes won't be returned. Default is `false`.
* `minetest.find_path(pos1,pos2,searchdistance,max_jump,max_drop,algorithm)`
* returns table containing path
* returns a table of 3D points representing a path from `pos1` to `pos2` or `nil`
@ -3755,6 +3761,26 @@ It can be created via `Settings(filename)`.
* Writes changes to file.
* `to_table()`: returns `{[key1]=value1,...}`
### `Raycast`
A raycast on the map. It works with selection boxes.
Can be used as an iterator in a for loop.
The map is loaded as the ray advances. If the
map is modified after the `Raycast` is created,
the changes may or may not have an effect on
the object.
It can be created via `Raycast(pos1, pos2, objects, liquids)` or
`minetest.raycast(pos1, pos2, objects, liquids)` where:
* `pos1`: start of the ray
* `pos2`: end of the ray
* `objects` : if false, only nodes will be returned. Default is true.
* `liquids' : if false, liquid nodes won't be returned. Default is false.
#### Methods
* `next()`: returns a `pointed_thing`
* Returns the next thing pointed by the ray or nil.
Mapgen objects
--------------
A mapgen object is a construct used in map generation. Mapgen objects can be used