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-"save_to_file/enabled": true,
-"save_to_file/make_streamable": "",
-"save_to_file/path": "res://interior/base/dungeon_01/tiles_endcap_south.res"
-},
-"tiles_endcap_west": {
-"generate/lightmap_uv": 0,
-"generate/lods": 0,
-"generate/shadow_meshes": 0,
-"lods/normal_merge_angle": 60.0,
-"lods/normal_split_angle": 25.0,
-"save_to_file/enabled": true,
-"save_to_file/make_streamable": "",
-"save_to_file/path": "res://interior/base/dungeon_01/tiles_endcap_west.res"
-},
-"tiles_fill": {
-"generate/lightmap_uv": 0,
-"generate/lods": 0,
-"generate/shadow_meshes": 0,
-"lods/normal_merge_angle": 60.0,
-"lods/normal_split_angle": 25.0,
-"save_to_file/enabled": true,
-"save_to_file/make_streamable": "",
-"save_to_file/path": "res://interior/base/dungeon_01/tiles_fill.res"
-},
-"tiles_island": {
-"generate/lightmap_uv": 0,
-"generate/lods": 0,
-"generate/shadow_meshes": 0,
-"lods/normal_merge_angle": 60.0,
-"lods/normal_split_angle": 25.0,
-"save_to_file/enabled": true,
-"save_to_file/make_streamable": "",
-"save_to_file/path": "res://interior/base/dungeon_01/tiles_island.res"
-},
-"tiles_path_horizontal": {
-"generate/lightmap_uv": 0,
-"generate/lods": 0,
-"generate/shadow_meshes": 0,
-"lods/normal_merge_angle": 60.0,
-"lods/normal_split_angle": 25.0,
-"save_to_file/enabled": true,
-"save_to_file/make_streamable": "",
-"save_to_file/path": "res://interior/base/dungeon_01/tiles_path_horizontal.res"
-},
-"tiles_path_vertical": {
-"generate/lightmap_uv": 0,
-"generate/lods": 0,
-"generate/shadow_meshes": 0,
-"lods/normal_merge_angle": 60.0,
-"lods/normal_split_angle": 25.0,
-"save_to_file/enabled": true,
-"save_to_file/make_streamable": "",
-"save_to_file/path": "res://interior/base/dungeon_01/tiles_path_vertical.res"
-}
-}
-}
-gltf/embedded_image_handling=0

interior/floors/interior_floor.gd

@@ -1,49 +0,0 @@
-class_name InteriorFloor extends Resource
-
-@export
-var corner_north_east_mesh: Mesh = null
-
-@export
-var corner_north_west_mesh: Mesh = null
-
-@export
-var corner_south_east_mesh: Mesh = null
-
-@export
-var corner_south_west_mesh: Mesh = null
-
-@export
-var edge_east_mesh: Mesh = null
-
-@export
-var edge_north_mesh: Mesh = null
-
-@export
-var edge_south_mesh: Mesh = null
-
-@export
-var edge_west_mesh: Mesh = null
-
-@export
-var endcap_east_mesh: Mesh = null
-
-@export
-var endcap_north_mesh: Mesh = null
-
-@export
-var endcap_south_mesh: Mesh = null
-
-@export
-var endcap_west_mesh: Mesh = null
-
-@export
-var fill_mesh: Mesh = null
-
-@export
-var island_mesh: Mesh = null
-
-@export
-var path_horizontal_mesh: Mesh = null
-
-@export
-var path_vertical_mesh: Mesh = null

interior/floors/wood_platforms/tiles.glb.import

@@ -1,145 +0,0 @@
-[remap]
-
-importer="scene"
-importer_version=1
-type="PackedScene"
-uid="uid://diwceah8n7mya"
-path="res://.godot/imported/tiles.glb-06c35114c4978742b880d24bfe15f3d9.scn"
-
-[deps]
-
-source_file="res://interior/floors/wood_platforms/tiles.glb"
-dest_files=["res://.godot/imported/tiles.glb-06c35114c4978742b880d24bfe15f3d9.scn"]
-
-[params]
-
-nodes/root_type="Node3D"
-nodes/root_name="Scene Root"
-nodes/apply_root_scale=true
-nodes/root_scale=1.0
-meshes/ensure_tangents=true
-meshes/generate_lods=true
-meshes/create_shadow_meshes=true
-meshes/light_baking=1
-meshes/lightmap_texel_size=0.2
-skins/use_named_skins=true
-animation/import=true
-animation/fps=30
-animation/trimming=false
-animation/remove_immutable_tracks=true
-import_script/path=""
-_subresources={
-"meshes": {
-"tiles_corner_north_east": {
-"generate/lightmap_uv": 0,
-"generate/lods": 0,
-"generate/shadow_meshes": 0,
-"lods/normal_merge_angle": 60.0,
-"lods/normal_split_angle": 25.0,
-"save_to_file/enabled": true,
-"save_to_file/make_streamable": "",
-"save_to_file/path": "res://interior/floors/wood_platforms/tiles_corner_north_east.res"
-},
-"tiles_corner_north_west": {
-"generate/lightmap_uv": 0,
-"generate/lods": 0,
-"generate/shadow_meshes": 0,
-"lods/normal_merge_angle": 60.0,
-"lods/normal_split_angle": 25.0,
-"save_to_file/enabled": true,
-"save_to_file/make_streamable": "",
-"save_to_file/path": "res://interior/floors/wood_platforms/tiles_corner_north_west.res"
-},
-"tiles_corner_south_east": {
-"generate/lightmap_uv": 0,
-"generate/lods": 0,
-"generate/shadow_meshes": 0,
-"lods/normal_merge_angle": 60.0,
-"lods/normal_split_angle": 25.0,
-"save_to_file/enabled": true,
-"save_to_file/make_streamable": "",
-"save_to_file/path": "res://interior/floors/wood_platforms/tiles_corner_south_east.res"
-},
-"tiles_corner_south_west": {
-"generate/lightmap_uv": 0,
-"generate/lods": 0,
-"generate/shadow_meshes": 0,
-"lods/normal_merge_angle": 60.0,
-"lods/normal_split_angle": 25.0,
-"save_to_file/enabled": true,
-"save_to_file/make_streamable": "",
-"save_to_file/path": "res://interior/floors/wood_platforms/tiles_corner_south_west.res"
-},
-"tiles_endcap_east&edge_east": {
-"generate/lightmap_uv": 0,
-"generate/lods": 0,
-"generate/shadow_meshes": 0,
-"lods/normal_merge_angle": 60.0,
-"lods/normal_split_angle": 25.0,
-"save_to_file/enabled": true,
-"save_to_file/make_streamable": "",
-"save_to_file/path": "res://interior/floors/wood_platforms/tiles_endcap_east&edge_east.res"
-},
-"tiles_endcap_north&edge_north": {
-"generate/lightmap_uv": 0,
-"generate/lods": 0,
-"generate/shadow_meshes": 0,
-"lods/normal_merge_angle": 60.0,
-"lods/normal_split_angle": 25.0,
-"save_to_file/enabled": true,
-"save_to_file/make_streamable": "",
-"save_to_file/path": "res://interior/floors/wood_platforms/tiles_endcap_north&edge_north.res"
-},
-"tiles_endcap_south&edge_south": {
-"generate/lightmap_uv": 0,
-"generate/lods": 0,
-"generate/shadow_meshes": 0,
-"lods/normal_merge_angle": 60.0,
-"lods/normal_split_angle": 25.0,
-"save_to_file/enabled": true,
-"save_to_file/make_streamable": "",
-"save_to_file/path": "res://interior/floors/wood_platforms/tiles_endcap_south&edge_south.res"
-},
-"tiles_endcap_west&edge_west": {
-"generate/lightmap_uv": 0,
-"generate/lods": 0,
-"generate/shadow_meshes": 0,
-"lods/normal_merge_angle": 60.0,
-"lods/normal_split_angle": 25.0,
-"save_to_file/enabled": true,
-"save_to_file/make_streamable": "",
-"save_to_file/path": "res://interior/floors/wood_platforms/tiles_endcap_west&edge_west.res"
-},
-"tiles_fill&path_horizontal": {
-"generate/lightmap_uv": 0,
-"generate/lods": 0,
-"generate/shadow_meshes": 0,
-"lods/normal_merge_angle": 60.0,
-"lods/normal_split_angle": 25.0,
-"save_to_file/enabled": true,
-"save_to_file/make_streamable": "",
-"save_to_file/path": "res://interior/floors/wood_platforms/tiles_fill&path_horizontal.res"
-},
-"tiles_island": {
-"generate/lightmap_uv": 0,
-"generate/lods": 0,
-"generate/shadow_meshes": 0,
-"lods/normal_merge_angle": 60.0,
-"lods/normal_split_angle": 25.0,
-"save_to_file/enabled": true,
-"save_to_file/make_streamable": "",
-"save_to_file/path": "res://interior/floors/wood_platforms/tiles_island.res"
-},
-"tiles_path_vertical": {
-"generate/lightmap_uv": 0,
-"generate/lods": 0,
-"generate/shadow_meshes": 0,
-"lods/normal_merge_angle": 60.0,
-"lods/normal_split_angle": 25.0,
-"save_to_file/enabled": true,
-"save_to_file/make_streamable": "",
-"save_to_file/path": "res://interior/floors/wood_platforms/tiles_path_vertical.res"
-}
-}
-}
-gltf/embedded_image_handling=1

interior/interior_map.gd

@@ -2,200 +2,173 @@ class_name InteriorMap extends Node3D
 
 const _CHUNK_SIZE := 32
 
-const _HALF_PI := PI / 2
-
 const _GRID_ORIGIN := Vector2(0.5, 0.5)
 
 ##
+## Cardinal orientation referencing the direction of a tile.
 ##
-##
-enum FloorTile {
-	ISLAND,
-	ENDCAP_WEST,
-	ENDCAP_NORTH,
-	CORNER_NORTH_WEST,
-	ENDCAP_EAST,
-	PATH_HORIZONTAL,
-	CORNER_NORTH_EAST,
-	EDGE_NORTH,
-	ENDCAP_SOUTH,
-	CORNER_SOUTH_WEST,
-	PATH_VERTICAL,
-	EDGE_WEST,
-	CORNER_SOUTH_EAST,
-	EDGE_SOUTH,
-	EDGE_EAST,
-	FILL,
-}
-
 enum Orientation {
-	EAST = 2 ** 0,
-	SOUTH = 2 ** 1,
-	WEST = 2 ** 2,
-	NORTH = 2 ** 3,
+	NORTH,
+	EAST,
+	SOUTH,
+	WEST,
 }
 
 ##
 ## Baked block of meshes making up a segment of the grid.
 ##
 class Chunk:
-	var _coordinates := Vector2i.ZERO
+	var _floor_meshes: Array[Mesh] = []
 
-	var _interior_map: InteriorMap = null
+	var _floor_orientation := PackedInt32Array()
 
-	var _renderables_by_mesh := {}
+	var _multi_mesh_instances: Array[MultiMeshInstance] = []
 
-	func _init(interior_map: InteriorMap, coordinates: Vector2i) -> void:
-		_interior_map = interior_map
-		_coordinates = coordinates
+	var _wall_meshes: Array[Mesh] = []
+
+	var _wall_orientation := PackedInt32Array()
+
+	func _init() -> void:
+		var buffer_size := _CHUNK_SIZE * _CHUNK_SIZE
+
+		_floor_meshes.resize(buffer_size)
+		_floor_orientation.resize(buffer_size)
+		_wall_meshes.resize(buffer_size)
+		_wall_orientation.resize(buffer_size)
 
 	##
 	## Invalidates the mesh block, re-baking its contents from the current mesh data set.
 	##
-	func invalidate() -> void:
-		_renderables_by_mesh.clear()
+	func invalidate(interior_map: InteriorMap, coordinate: Vector2i) -> void:
+		# TODO: Once this is all lowered into native code, look for ways to parallelize the loops.
+		for multi_mesh_instance in _multi_mesh_instances:
+			RenderingServer.free_rid(multi_mesh_instance._instance_rid)
+			RenderingServer.free_rid(multi_mesh_instance._multimesh_rid)
 
-		var floor_map := _interior_map._floor_map
-		var map_size := _interior_map.size
-		var offset := _coordinates * _CHUNK_SIZE
-		var positions_by_mesh := {}
-		var map_area := Rect2i(Vector2.ZERO, map_size)
+		_multi_mesh_instances.clear()
 
-		for y in _CHUNK_SIZE:
-			var map_row_offset := (map_size.y * y)
+		# Normalize mesh instance data for the chunk.
+		var transforms_by_mesh := {}
+		var grid_size := interior_map.size
+		var half_pi := PI / 2
 
-			for x in _CHUNK_SIZE:
-				var map_coordinates := offset + Vector2i(x, y)
+		for i in _floor_meshes.size():
+			var mesh := _floor_meshes[i]
 
-				if map_area.has_point(map_coordinates):
-					var interior_floor := floor_map[map_row_offset + map_coordinates.x]
+			if mesh != null:
+				if not(mesh in transforms_by_mesh):
+					transforms_by_mesh[mesh] = []
 
-					if interior_floor != null:
-						var tile := 0
+				transforms_by_mesh[mesh].append(Transform3D(
+					Basis.IDENTITY.rotated(Vector3.UP, half_pi * _floor_orientation[i]), Vector3(
+						(float(coordinate.x * _CHUNK_SIZE) + (i % _CHUNK_SIZE)) -
+							(float(grid_size.x) * _GRID_ORIGIN.x) + 0.5, 0.0,
+								(float(coordinate.y * _CHUNK_SIZE) + (i / _CHUNK_SIZE)) - 
+									(float(grid_size.y) * _GRID_ORIGIN.y) + 0.5)))
 
-						for i in Orientation.values().size():
-							var map_neighbor := map_coordinates + Vector2i(
-								roundi(cos(i * PI / 2.0)), roundi(sin(i * PI / 2.0)))
+		for i in _wall_meshes.size():
+			var mesh := _wall_meshes[i]
 
-							if map_area.has_point(map_neighbor):
-								tile += int(floor_map[(map_size.y * map_neighbor.y) + map_neighbor.x] == interior_floor) * 2 ** i
+			if mesh != null:
+				if not(mesh in transforms_by_mesh):
+					transforms_by_mesh[mesh] = []
 
-						var mesh: Mesh = null
+				transforms_by_mesh[mesh].append(Transform3D(
+					Basis.IDENTITY.rotated(Vector3.UP, half_pi * _wall_orientation[i]), Vector3(
+						(float(coordinate.x * _CHUNK_SIZE) + (i % _CHUNK_SIZE)) -
+							(float(grid_size.x) * _GRID_ORIGIN.x) + 0.5, 0.0,
+								(float(coordinate.y * _CHUNK_SIZE) + (i / _CHUNK_SIZE)) - 
+									(float(grid_size.y) * _GRID_ORIGIN.y) + 0.5)))
 
-						match tile:
-							FloorTile.ISLAND: mesh = interior_floor.island_mesh
-							FloorTile.ENDCAP_WEST: mesh = interior_floor.endcap_west_mesh
-							FloorTile.ENDCAP_NORTH: mesh = interior_floor.endcap_north_mesh
-							FloorTile.CORNER_NORTH_WEST: mesh = interior_floor.corner_north_west_mesh
-							FloorTile.ENDCAP_EAST: mesh = interior_floor.endcap_east_mesh
-							FloorTile.PATH_HORIZONTAL: mesh = interior_floor.path_horizontal_mesh
-							FloorTile.CORNER_NORTH_EAST: mesh = interior_floor.corner_north_east_mesh
-							FloorTile.EDGE_NORTH: mesh = interior_floor.edge_north_mesh
-							FloorTile.ENDCAP_SOUTH: mesh = interior_floor.endcap_south_mesh
-							FloorTile.CORNER_SOUTH_WEST: mesh = interior_floor.corner_south_west_mesh
-							FloorTile.PATH_VERTICAL: mesh = interior_floor.path_vertical_mesh
-							FloorTile.EDGE_WEST: mesh = interior_floor.edge_west_mesh
-							FloorTile.CORNER_SOUTH_EAST: mesh = interior_floor.corner_south_east_mesh
-							FloorTile.EDGE_SOUTH: mesh = interior_floor.edge_south_mesh
-							FloorTile.EDGE_EAST: mesh = interior_floor.edge_east_mesh
-							FloorTile.FILL: mesh = interior_floor.fill_mesh
+		# (Re)-bake into multimesh instances for the chunk.
+		var scenario_rid := interior_map.get_world_3d().scenario
+		var global_transform := interior_map.global_transform
 
-						if mesh != null:
-							if not(mesh in positions_by_mesh):
-								positions_by_mesh[mesh] = PackedVector2Array()
+		for chunk_mesh in transforms_by_mesh:
+			var multi_mesh_instance := MultiMeshInstance.new(
+				scenario_rid, chunk_mesh.get_rid(), transforms_by_mesh[chunk_mesh])
 
-							positions_by_mesh[mesh].append(Vector2(x, y))
+			multi_mesh_instance.set_offset(global_transform)
+			_multi_mesh_instances.append(multi_mesh_instance)
 
-		# (Re)-bake tiles into multimesh instances for the chunk.
-		var scenario_rid := _interior_map.get_world_3d().scenario
+	##
+	## Sets the floor mesh in the chunk at the location relative [code]coordinatess[/code] to
+	## [code]mesh[/code].
+	##
+	## *Note* that [method Chunk.invalidate] must be called at some point after to visually update
+	## the chunk.
+	##
+	func set_floor_mesh(coordinates: Vector2i, orientation: Orientation, mesh: Mesh) -> void:
+		var index := (_CHUNK_SIZE * coordinates.y) + coordinates.x
 
-		for mesh in positions_by_mesh:
-			var positions: PackedVector2Array = positions_by_mesh[mesh]
+		_floor_orientation[index] = orientation
+		_floor_meshes[index] = mesh
 
-			if not(positions.is_empty()):
-				var position_count := positions.size()
-				var renderable := Renderable.new(scenario_rid, mesh.get_rid(), position_count)
+	##
+	## Sets the wall mesh in the chunk at the location relative [code]coordinatess[/code] to
+	## [code]mesh[/code].
+	##
+	## *Note* that [method Chunk.invalidate] must be called at some point after to visually update
+	## the chunk.
+	##
+	func set_wall_mesh(coordinates: Vector2i, orientation: Orientation, mesh: Mesh) -> void:
+		var index := (_CHUNK_SIZE * coordinates.y) + coordinates.x
 
-				for i in position_count:
-					var position := positions[i]
-
-					renderable.set_instance_transform(i, Transform3D(Basis.IDENTITY, Vector3(
-						((float(offset.x) + position.x) - (float(map_size.x) * _GRID_ORIGIN.x)) + 0.5,
-							0.0,
-								((float(offset.y) + position.y) - (float(map_size.y) * _GRID_ORIGIN.y)) + 0.5)))
-
-				_renderables_by_mesh[mesh] = renderable
-
-	func set_transform(transform: Transform3D) -> void:
-		for mesh in _renderables_by_mesh:
-			_renderables_by_mesh[mesh].set_transform(transform)
-
-	func set_visible(visible: bool) -> void:
-		for mesh in _renderables_by_mesh:
-			_renderables_by_mesh[mesh].set_visible(visible)
+		_wall_orientation[index] = orientation
+		_wall_meshes[index] = mesh
 
 ##
+## Specialized multi-mesh instance convenience for use within the tile grid and its chunks.
 ##
-##
-class Renderable:
+class MultiMeshInstance:
 	var _instance_rid := RID()
 
 	var _multimesh_rid := RID()
 
-	func _init(scenario_rid: RID, mesh_rid: RID, transform_count: int) -> void:
+	func _init(scenario_rid: RID, mesh_rid: RID, transforms: Array) -> void:
 		_multimesh_rid = RenderingServer.multimesh_create()
 		_instance_rid = RenderingServer.instance_create2(_multimesh_rid, scenario_rid)
 
 		RenderingServer.multimesh_set_mesh(_multimesh_rid, mesh_rid)
 
+		var transform_count := transforms.size()
+
 		RenderingServer.multimesh_allocate_data(_multimesh_rid,
 			transform_count, RenderingServer.MULTIMESH_TRANSFORM_3D, true)
 
-	func _notification(what: int) -> void:
-		match what:
-			NOTIFICATION_PREDELETE:
-				RenderingServer.free_rid(_instance_rid)
-				RenderingServer.free_rid(_multimesh_rid)
+		for i in transform_count:
+			RenderingServer.multimesh_instance_set_transform(_multimesh_rid, i, transforms[i])
 
 	##
+	## Sets the transform of the instance to [code]offset[/code].
 	##
-	##
-	func set_instance_transform(instance_index: int, transform: Transform3D) -> void:
-		RenderingServer.multimesh_instance_set_transform(_multimesh_rid, instance_index, transform)
+	func set_offset(offset: Transform3D) -> void:
+		RenderingServer.instance_set_transform(_instance_rid, offset)
 
 	##
+	## Sets the visibility of the instance to [code]is_visible[/code].
 	##
-	##
-	func set_visible(visible: bool) -> void:
-		RenderingServer.instance_set_visible(_instance_rid, visible)
-
-	##
-	##
-	##
-	func set_transform(transform: Transform3D) -> void:
-		RenderingServer.instance_set_transform(_instance_rid, transform)
+	func set_visible(is_visible: bool) -> void:
+		RenderingServer.instance_set_visible(_instance_rid, is_visible)
 
 var _chunks: Array[Chunk] = []
 
 var _chunks_size := Vector2i.ZERO
 
-var _floor_map: Array[InteriorFloor] = []
-
 ##
 ## Size of the tile grid (in engine units).
 ##
 @export
 var size: Vector2i:
 	set(value):
+		var chunk_size_factor := float(_CHUNK_SIZE)
+
+		_chunks.resize(int(ceilf(value.x / chunk_size_factor) * ceilf(value.y / chunk_size_factor)))
+
+		for i in _chunks.size():
+			_chunks[i] = Chunk.new()
+
 		_chunks_size = Vector2i((value / float(_CHUNK_SIZE)).ceil())
-
-		_floor_map.resize(value.x * value.y)
-		_chunks.resize(_chunks_size.x * _chunks_size.y)
-
-		for y in _chunks_size.y:
-			for x in _chunks_size.x:
-				_chunks[(y * _CHUNK_SIZE) + x] = Chunk.new(self, Vector2i(x, y))
-
 		size = value
 
 func _get_chunk(chunk_coordinate: Vector2i) -> Chunk:
@@ -205,11 +178,13 @@ func _notification(what: int) -> void:
 	match what:
 		NOTIFICATION_TRANSFORM_CHANGED:
 			for chunk in _chunks:
-				chunk.set_transform(global_transform)
+				for multi_mesh_instance in chunk._multi_mesh_instances:
+					multi_mesh_instance.set_offset_transform(global_transform)
 
 		NOTIFICATION_VISIBILITY_CHANGED:
 			for chunk in _chunks:
-				chunk.set_visible(visible)
+				for multi_mesh_instance in chunk._multi_mesh_instances:
+					multi_mesh_instance.set_visible(visible)
 
 ##
 ## Clears the entirety of the tile grid to only contain tiles of instance [code]tile[/code] pointing
@@ -217,17 +192,46 @@ func _notification(what: int) -> void:
 ##
 ## For clearing a specific region of the mesh grid, see [method fill_mesh].
 ##
-func clear() -> void:
-	for i in _floor_map.size():
-		_floor_map[i] = null
+func clear_tiles(orientation: Orientation, tile: InteriorTile) -> void:
+	if tile == null:
+		for y in size.y:
+			for x in size.x:
+				var coordinates := Vector2i(x, y)
+				var chunk := _get_chunk(coordinates / _CHUNK_SIZE)
+				var chunk_coordinates := coordinates % _CHUNK_SIZE
+
+				chunk.set_floor_mesh(chunk_coordinates, orientation, null)
+				chunk.set_wall_mesh(chunk_coordinates, orientation, null)
+
+	else:
+		var mesh := tile.mesh
+
+		match tile.kind:
+			InteriorTile.Kind.FLOOR:
+				for y in size.y:
+					for x in size.x:
+						var coordinate := Vector2i(x, y)
+
+						_get_chunk(coordinate / _CHUNK_SIZE).\
+							set_floor_mesh(coordinate % _CHUNK_SIZE, orientation, mesh)
+
+			InteriorTile.Kind.WALL:
+				for y in size.y:
+					for x in size.x:
+						var coordinate := Vector2i(x, y)
+
+						_get_chunk(coordinate / _CHUNK_SIZE).\
+							set_floor_mesh(coordinate % _CHUNK_SIZE, orientation, mesh)
 
 	for y in _chunks_size.y:
 		for x in _chunks_size.x:
-			_get_chunk(Vector2i(x, y)).invalidate()
+			var chunk_coordinate := Vector2i(x, y)
+
+			_get_chunk(chunk_coordinate).invalidate(self, chunk_coordinate)
 
 ##
 ## Clears the region of the tile grid at [code]area[/code] to only contain instances of
-## [code]interior_floor[/code].
+## [code]tile[/code] pointing in the orientation of [code]orientation[/code].
 ##
 ## *Note* that [code]area[/code] *must* be within the area of the of the mesh grid, where
 ## [code]Vector2i.ZERO[/code] is the top-left and [member size] [code]- 1[/code] is the bottom-
@@ -235,25 +239,70 @@ func clear() -> void:
 ##
 ## For clearing the whole of the mesh grid, see [method clear_mesh].
 ##
-func fill_floor(area: Rect2i, interior_floor: InteriorFloor) -> void:
-	assert(Rect2i(Vector2i.ZERO, size).encloses(area), "area must be within grid")
+func fill_tiles(area: Rect2i, orientation: Orientation, tile: InteriorTile) -> void:
+	assert(get_area().encloses(area), "area must be within grid")
 
 	var filled_chunks := BitMap.new()
 
 	filled_chunks.resize(_chunks_size)
 
-	for y in range(area.position.y, area.end.y):
-		for x in range(area.position.x, area.end.x):
-			_floor_map[(size.y * (y / _CHUNK_SIZE)) + (x / _CHUNK_SIZE)] = interior_floor
+	if tile == null:
+		for y in range(area.position.y, area.end.y):
+			for x in range(area.position.x, area.end.x):
+				var coordinates := Vector2i(x, y)
+				var chunk_coordinates := coordinates / _CHUNK_SIZE
+				var chunk := _get_chunk(coordinates / _CHUNK_SIZE)
+				var local_coordinates := coordinates % _CHUNK_SIZE
+
+				chunk.set_floor_mesh(local_coordinates, orientation, null)
+				chunk.set_wall_mesh(local_coordinates, orientation, null)
+				filled_chunks.set_bitv(chunk_coordinates, true)
+
+	else:
+		var mesh := tile.mesh
+
+		if tile.fixed_orientation:
+			orientation = Orientation.NORTH
+
+		match tile.kind:
+			InteriorTile.Kind.FLOOR:
+				for y in range(area.position.y, area.end.y):
+					for x in range(area.position.x, area.end.x):
+						var coordinate := Vector2i(x, y)
+						var chunk_coordinate := coordinate / _CHUNK_SIZE
+
+						_get_chunk(chunk_coordinate).set_floor_mesh(
+							coordinate % _CHUNK_SIZE, orientation, mesh)
+
+						filled_chunks.set_bitv(chunk_coordinate, true)
+
+			InteriorTile.Kind.WALL:
+				for y in range(area.position.y, area.end.y):
+					for x in range(area.position.x, area.end.x):
+						var coordinate := Vector2i(x, y)
+						var chunk_coordinate := coordinate / _CHUNK_SIZE
+
+						_get_chunk(chunk_coordinate).set_wall_mesh(
+							coordinate % _CHUNK_SIZE, orientation, mesh)
+
+						filled_chunks.set_bitv(chunk_coordinate, true)
 
 	for y in _chunks_size.y:
 		for x in _chunks_size.x:
 			if filled_chunks.get_bit(x, y):
-				_get_chunk(Vector2i(x, y)).invalidate()
+				var chunk_coordinate := Vector2i(x, y)
+
+				_get_chunk(chunk_coordinate).invalidate(self, chunk_coordinate)
 
 ##
-## Plots a single tile at [code]coordinates[/code] to be an instance of [code]interior_floor[/code],
-## overwriting whatever it previously contained.
+## Returns the area of the interior map based on its current size.
+##
+func get_area() -> Rect2i:
+	return Rect2i(Vector2i.ZERO, size)
+
+##
+## Plots a single tile at [code]coordinates[/code] to be an instance of [code]tile[/code] pointing
+## in the orientation of [code]orientation[/code], overwriting whatever it previously contained.
 ##
 ## *Note* that [code]coordinates[/code] *must* be within the area of the of the mesh grid, where
 ## [code]Vector2i.ZERO[/code] is the top-left and [member size] [code]- 1[/code] is the bottom-
@@ -261,9 +310,30 @@ func fill_floor(area: Rect2i, interior_floor: InteriorFloor) -> void:
 ##
 ## For bulk-setting many meshes at once, see [method fill_mesh] and [method clear_mesh].
 ##
-func plot_floor(coordinates: Vector2i, interior_floor: InteriorFloor) -> void:
-	assert(Rect2i(Vector2i.ZERO, size).has_point(coordinates), "coordinate must be within grid")
+func plot_tile(coordinates: Vector2i, orientation: Orientation, tile: InteriorTile) -> void:
+	assert(get_area().has_point(coordinates), "coordinate must be within grid")
 
-	_floor_map[(size.y * coordinates.y) + coordinates.x] = interior_floor
+	var chunk_coordinates := coordinates / _CHUNK_SIZE
+	var chunk := _get_chunk(chunk_coordinates)
 
-	_get_chunk(coordinates / _CHUNK_SIZE).invalidate()
+	if tile == null:
+		var local_coordinates := coordinates % _CHUNK_SIZE
+
+		chunk.set_floor_mesh(local_coordinates, orientation, null)
+		chunk.set_wall_mesh(local_coordinates, orientation, null)
+		chunk.invalidate(self, chunk_coordinates)
+
+	else:
+		var mesh := tile.mesh
+
+		if tile.fixed_orientation:
+			orientation = Orientation.NORTH
+
+		match tile.kind:
+			InteriorTile.Kind.FLOOR:
+				chunk.set_floor_mesh(coordinates % _CHUNK_SIZE, orientation, mesh)
+				chunk.invalidate(self, chunk_coordinates)
+
+			InteriorTile.Kind.WALL:
+				chunk.set_wall_mesh(coordinates % _CHUNK_SIZE, orientation, mesh)
+				chunk.invalidate(self, chunk_coordinates)

interior/interior_tile.gd

@@ -0,0 +1,29 @@
+class_name InteriorTile extends Resource
+
+##
+## Identifier for the kind of interior tile.
+##
+enum Kind {
+	FLOOR,
+	WALL,
+}
+
+##
+## Flag for determining if the tile is affected by orientations specified in an [InteriorMap].
+##
+@export
+var fixed_orientation := false
+
+##
+## See [enum Kind].
+##
+## Interior tiles of different kinds will not conflict when placing them.
+##
+@export
+var kind := Kind.FLOOR
+
+##
+## Used to visualize the interior tile.
+##
+@export
+var mesh: Mesh = null

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