Difference between revisions of "Player-World Interaction"

From Minetest Developer Wiki
Jump to navigation Jump to search
(remove randomly interspersed broken wikilinks)
 
(3 intermediate revisions by 2 users not shown)
Line 1: Line 1:
TODO
+
{{Incomplete}}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
== Digging a node ==
 
== Digging a node ==
  
Preconditions are a [[node]] somewhere in the [[map]].<br/>
+
Preconditions are a node somewhere in the map.<br/>
This node is [[pointable]], has a [[selection box]] and [[diggable| can be dug]] by the [[hand]] or the [[tool]] the [[player]] is wearing.<br/>
+
This node is pointable, has a selection box and can be dug by the hand or the tool the player is wielding.<br/>
The player has interact [[priv]] and the tool has a [[tool range]] that the node can be pointed.<br/>
+
The player has interact priv and the tool has a tool range that the node can be pointed.<br/>
 
The node is not stuck somewhere the player can't point it.
 
The node is not stuck somewhere the player can't point it.
  
* First look at the node, it becomes [[pointed_thing| pointed]].
+
* First look at the node, it becomes pointed_thing.
: Note that on [[android]] the node is pointed without looking (referring to the cross position) at it.
+
: Note that on android the node is pointed without looking (referring to the cross position) at it.
* Then [[LMB]] is pressed down while holding an item which does not have [[on_use]].
+
* Then LMB is pressed down while holding an item which does not have on_use.
 
: If LMB wasn't released before, a click happens, which causes a punch event.
 
: If LMB wasn't released before, a click happens, which causes a punch event.
 
:: The client send a punch event (client->interact(4, pointed), see game.cpp:3657 (28.02.2017)).
 
:: The client send a punch event (client->interact(4, pointed), see game.cpp:3657 (28.02.2017)).
:: On server side the punch event is passed to mods, see [[on_punch]] and the deprecated [[register_on_punchnode]].
+
:: On server side the punch event is passed to mods, see on_punch and the deprecated register_on_punchnode.
 
: Then the client sends the digging start event to the server (interact(0, pointed), game.cpp:3948).
 
: Then the client sends the digging start event to the server (interact(0, pointed), game.cpp:3948).
 
:: The server uses this information for anticheat measurements.
 
:: The server uses this information for anticheat measurements.
 
* Now continue looking at the node, i.e. keep pointing it, and hold down LMB.
 
* Now continue looking at the node, i.e. keep pointing it, and hold down LMB.
: Periodically client-side: Crack animation is updated, digging particles are spawned (if not disabled in the settings) and the [[node dig sound]] is played.
+
: Periodically client-side: Crack animation is updated, digging particles are spawned (if not disabled in the settings) and the node dig sound is played.
:: The dig sound is either the "dig" field in the "sounds" [[register_node#Node_definition| table in the nodedef]]
+
:: The dig sound is either the "dig" field in the "sounds" table in the nodedef
 
:: or, if it's not present, the client uses the sound "default_dig_${groupname}" (file name extension omitted here), where $groupname is one of the groups the node has, see (game.cpp:4001), and gain is set to 0.5.
 
:: or, if it's not present, the client uses the sound "default_dig_${groupname}" (file name extension omitted here), where $groupname is one of the groups the node has, see (game.cpp:4001), and gain is set to 0.5.
 
:: The default_dig_ thing should be banned from source code in my opinion.
 
:: The default_dig_ thing should be banned from source code in my opinion.
* Some time later, when the [[digging time]] elapsed,
+
* Some time later, when the digging time elapsed,
 
: the client sends a digging completion event to the server (interact(2, pointed), game.cpp:4018),
 
: the client sends a digging completion event to the server (interact(2, pointed), game.cpp:4018),
 
: the node disappears client-side,
 
: the node disappears client-side,
Line 35: Line 28:
 
* Now the server recieves the digging completion event.
 
* Now the server recieves the digging completion event.
 
: Anticheat probably, e.g due to lag, thinks the player dug the node too fast.
 
: Anticheat probably, e.g due to lag, thinks the player dug the node too fast.
:: dug_too_fast cheat is passed to mods, see [[register_on_cheat]], and digging aborts.
+
:: dug_too_fast cheat is passed to mods, see register_on_cheat, and digging aborts.
: If the nodedef has a [[can_dig]] function, it's executed and probably stops the digging.
+
: If the nodedef has a can_dig function, it's executed and probably stops the digging.
: The [[on_dig]] function in the nodedef is called now.
+
: The on_dig function in the nodedef is called now.
 
:: The default on_dig function problably removes the node:
 
:: The default on_dig function problably removes the node:
::: The [[on_destruct]] is executed, [[Basic Data Structures| air]] is set and [[after_destruct]] is executed.
+
::: The on_destruct is executed, air is set and after_destruct is executed.
:: And probably (the same probably as before) it then calls the [[after_dig_node]] function in the nodedef if present.
+
:: And probably (the same probably as before) it then calls the after_dig_node function in the nodedef if present.
 +
 
 +
[[Category:Core Engine]]

Latest revision as of 19:08, 25 January 2023

Mbox important.png This article is incomplete.
Please help expand this article to include more useful information.

Digging a node

Preconditions are a node somewhere in the map.
This node is pointable, has a selection box and can be dug by the hand or the tool the player is wielding.
The player has interact priv and the tool has a tool range that the node can be pointed.
The node is not stuck somewhere the player can't point it.

  • First look at the node, it becomes pointed_thing.
Note that on android the node is pointed without looking (referring to the cross position) at it.
  • Then LMB is pressed down while holding an item which does not have on_use.
If LMB wasn't released before, a click happens, which causes a punch event.
The client send a punch event (client->interact(4, pointed), see game.cpp:3657 (28.02.2017)).
On server side the punch event is passed to mods, see on_punch and the deprecated register_on_punchnode.
Then the client sends the digging start event to the server (interact(0, pointed), game.cpp:3948).
The server uses this information for anticheat measurements.
  • Now continue looking at the node, i.e. keep pointing it, and hold down LMB.
Periodically client-side: Crack animation is updated, digging particles are spawned (if not disabled in the settings) and the node dig sound is played.
The dig sound is either the "dig" field in the "sounds" table in the nodedef
or, if it's not present, the client uses the sound "default_dig_${groupname}" (file name extension omitted here), where $groupname is one of the groups the node has, see (game.cpp:4001), and gain is set to 0.5.
The default_dig_ thing should be banned from source code in my opinion.
  • Some time later, when the digging time elapsed,
the client sends a digging completion event to the server (interact(2, pointed), game.cpp:4018),
the node disappears client-side,
more particles are spawned (if enabled) and
the dug sound is played.
  • Now the server recieves the digging completion event.
Anticheat probably, e.g due to lag, thinks the player dug the node too fast.
dug_too_fast cheat is passed to mods, see register_on_cheat, and digging aborts.
If the nodedef has a can_dig function, it's executed and probably stops the digging.
The on_dig function in the nodedef is called now.
The default on_dig function problably removes the node:
The on_destruct is executed, air is set and after_destruct is executed.
And probably (the same probably as before) it then calls the after_dig_node function in the nodedef if present.