ObjectSurfaceMountRegistry2D

Local GRID surface projection of the 2D committed world: which node holds each (host_cell, host_slot, slot_index) stacking socket, and the mount each node was placed on. The [PlacementWorldRegistry] stays the shared authority for WHETHER a placement is legal; this registry is the per-socket index of WHICH node holds each slot, so validation can answer "is slot 2 of this table's surface taken?" in O(1) instead of scanning committed records. This is the 2D sibling of [ObjectMountRegistry3D], and it carries the same relationship the 3D one applies between [code]tops[/code] and [code]edges[/code]: the host keeps its own cell occupancy while the stacked object lives in a separate slot table, so the two coexist instead of fighting over one key. [b]Authority[/b]: nothing here decides legality. Callers validate through [method ObjectSurfaceValidation2D.can_place_on_surface] first; this registry only records and answers "who is there". That split is what keeps a registry bug from silently authorizing a placement.

Source: addons/grid_placement/systems/building/2d/object_surface_mount_registry_2d.gd

Syntax

class ObjectSurfaceMountRegistry2D extends RefCounted

Members

Name	Kind	Summary
slots	Property	Slot key ([method PlacementMount2D.slot_key]) -> the node mounted there.
placement_records	Property	Node -> the [PlacementMount2D] it was placed on.
band_slots	Property	Band key ([method PlacementMount2D.band_key]) -> slot keys already taken in that height band. Lets the first-free-slot search skip occupied slots without walking every host.
revision	Property	Incremented by every mutation, so cached validation can tell the state changed without re-querying.
mount_of	Method
node_at	Method
register_surface_node	Method
key	Property
band	Property
taken	Property
release	Method
is_slot_occupied	Method
conflicts_with_other	Method
first_free_slot	Method
surface_nodes	Method
capture	Method
restore	Method
clear	Method