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Improve doc/lua_api.txt

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Perttu Ahola 2012-04-07 19:59:03 +03:00
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doc/lua_api.txt
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@ -172,27 +172,47 @@ Examples of sound parameter tables:
loop = true, -- only sounds connected to objects can be looped
}
Representations of simple things
--------------------------------
MapNode representation:
{name="name", param1=num, param2=num}
Nodes
------
Nodes are the bulk data of the world: cubes and other things that take the
space of a cube. Huge amounts of them are handled efficiently, but they
are quite static.
MapNodes do not directly have any other data associated with them.
If you want to access the definition of the node, you access
The definition of a node is stored and can be accessed by name in
minetest.registered_nodes[node.name]
param1 and param2 are 8 bit and 4 bit integers, respectively. They
are reserved for certain automated functions. If you don't use these
Please note that for unknown nodes (eg. a node of an uninstalled mod) the
minetest.registered_nodes field for the node is nil.
Nodes are passed by value in Lua. They are represented by a table:
{name="name", param1=num, param2=num}
param1 and param2 are 8 bit and 4 bit integers, respectively. The engine
uses them for certain automated functions. If you don't use these
functions, you can use them to store arbitrary values.
param1 is reserved for the engine when:
paramtype != "none"
The functions of param1 and param2 are determined by certain fields in the
node definition:
param1 is reserved for the engine when paramtype != "none":
paramtype = "light"
^ The value stores light with and without sun in it's
upper and lower 4 bits.
param2 is reserved for the engine when any of these are used:
liquidtype == "flowing"
^ The level and some flags of the liquid is stored in param2
drawtype == "flowingliquid"
^ The drawn liquid level is read from param2
drawtype == "torchlike"
drawtype == "signlike"
paramtype2 == "wallmounted"
^ The rotation of the node is stored in param2. You can make this value
by using minetest.dir_to_wallmounted().
paramtype2 == "facedir"
^ The rotation of the node is stored in param2. Furnaces and chests are
rotated this way. Can be made by using minetest.dir_to_facedir().
Representations of simple things
--------------------------------
Position/vector:
{x=num, y=num, z=num}
Currently the API does not provide any helper functions for addition,