PlacementValidationContext

Context object carrying all necessary data for placement validation. Supports both object-based (via indicators) and terrain-based (via cells) validation.

Source: addons/grid_placement/placement/placement_rules/placement_validation_context.gd

Syntax

class PlacementValidationContext extends RefCounted

Members

Name	Kind	Summary
action_type	Property	The type of action being validated.
cell	Property	The cell being validated.
cell_3d	Property	The 3D cell being validated. Set only by [method for_terrain_3d]; the 2D [member cell] stays at its default so 2D-only rules never observe a 3D paint through a 2D coordinate.
terrain_name	Property	The terrain name (if in PAINT_TILE mode).
placeable	Property	The placeable resource (if in PLACE_OBJECT mode).
preview_cells	Property	All cells currently being placed/previewed (for adjacency checks in a brush). Also known as batch cells.
preview_cells_3d	Property	3D batch cells for multi-cell 3D terrain validation. Set only by [method for_terrain_3d].
indicator	Property	The indicator being validated (if in PLACE_OBJECT mode).
target_map	Property	The target TileMapLayer.
target_map_3d	Property	The target GridMap for 3D terrain validation. Set only by [method for_terrain_3d].
is_3d	Property	True when this context describes a 3D terrain paint. The validation pipeline runs only rules that opt into 3D (see [method TilePaintRule.supports_3d_terrain]) so 2D-only rules never observe 3D coordinates they cannot interpret.
targeting_state	Property	Reference to the targeting state for occupancy and collision queries.
world_facts_provider_2d	Property	Optional game-owned provider for placement-relevant world/physics facts. Grid Placement consumes this abstraction but does not own the backend (Godot Physics, Avian 2D, custom simulation, etc.).
shared_cache	Property	Per-batch scratch cache shared across every cell context in one multi-cell validation pass (line/rect/outline/flood). Rules memoize expensive, cell-independent resolutions here (e.g. a terrain's collision polygons) so a batch resolves them once instead of once per cell. Empty for single-cell validation. Lifetime = one batch; never global static state.
for_terrain	Method
ctx	Property
for_terrain_3d	Method
ctx	Property
for_object	Method
ctx	Property