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minetest/doc/builtin_entities.md

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Builtin Entities

Minetest registers two entities by default: Falling nodes and dropped items. This document describes how they behave and what you can do with them.

Falling node (__builtin:falling_node)

This entity is created by minetest.check_for_falling in place of a node with the special group falling_node=1. Falling nodes can also be created artificially with minetest.spawn_falling_node.

Needs manual initialization when spawned using /spawnentity.

Default behavior:

  • Falls down in a straight line (gravity = movement_gravity setting)
  • Collides with walkable node
  • Collides with all physical objects except players
  • If the node group float=1 is set, it also collides with liquid nodes (nodes with liquidtype ~= "none")
  • When it hits a solid (=walkable) node, it will try to place itself as a node, replacing the node above.
    • If the falling node cannot replace the destination node, it is dropped as an item.
    • If the destination node is a leveled node (paramtype2="leveled") of the same node name, the levels of both are summed.

Entity fields

  • set_node(self, node[, meta])
    • Function to initialize the falling node
    • node and meta are explained below.
    • The meta argument is optional.
  • node: Node table of the node (name, param1, param2) that this entity represents. Read-only.
  • meta: Node metadata of the falling node. Will be used when the falling nodes tries to place itself as a node. Read-only.

Rendering / supported nodes

Falling nodes have visuals to look as close as possible to the original node. This works for most drawtypes, but there are limitations.

Supported drawtypes:

  • normal
  • signlike
  • torchlike
  • nodebox
  • raillike
  • glasslike
  • glasslike_framed
  • glasslike_framed_optional
  • allfaces
  • allfaces_optional
  • firelike
  • mesh
  • fencelike
  • liquid
  • airlike (not pointable)

Other drawtypes still kinda work, but they might look weird. If the node uses a world-aligned texture with a scale greater than 1, the falling node will display the top-most, left-most portion of that texture.

Supported paramtype2 values:

  • wallmounted
  • facedir
  • 4dir
  • colorwallmounted
  • colorfacedir
  • color4dir
  • color

Dropped item stack (__builtin:item)

This is an item stack in a collectable form.

Common cases that spawn a dropped item:

  • Item dropped by player
  • The root node of a node with the group attached_node=1 is removed
  • minetest.add_item is called

Needs manual initialization when spawned using /spawnentity.

Behavior

  • Players can collect it by punching
  • Lifespan is defined by the setting item_entity_ttl
  • Slides on slippery nodes
  • Subject to gravity (uses movement_gravity setting)
  • Collides with walkable nodes
  • Does not collide physical objects
  • When it's inside a solid (walkable=true) node, it tries to escape to a neighboring non-solid (walkable=false) node

Entity fields

  • set_item(self, item):
    • Function to initialize the dropped item
    • item (type ItemStack) specifies the item to represent
  • age: Age in seconds. Behavior according to the setting item_entity_ttl
  • itemstring: Itemstring of the item that this item entity represents. Read-only.

Other fields are for internal use only.