Expand procedural terrain generation

world/generation/biomes/definitions/biome_coast.tres

@@ -17,4 +17,5 @@ script = ExtResource("1_definition")
 stable_id = &"biome_coast"
 label = "coast"
 required_chunk_tags = PackedStringArray("sand")
+forbidden_chunk_tags = PackedStringArray("mixed_surface")
 prop_rules = Array[ExtResource("2_rule")]([SubResource("Rule_sand_tree")])

world/generation/biomes/definitions/biome_forest.tres

@@ -27,6 +27,6 @@ script = ExtResource("1_definition")
 stable_id = &"biome_forest"
 label = "forest"
 required_chunk_tags = PackedStringArray("grass")
-forbidden_chunk_tags = PackedStringArray("spawn")
+forbidden_chunk_tags = PackedStringArray("spawn", "mixed_surface")
 region_weight = 1.4
 prop_rules = Array[ExtResource("2_rule")]([SubResource("Rule_grass_tree"), SubResource("Rule_grass_detail")])

world/generation/biomes/definitions/biome_pine_forest.tres

@@ -27,6 +27,6 @@ script = ExtResource("1_definition")
 stable_id = &"biome_pine_forest"
 label = "pine forest"
 required_chunk_tags = PackedStringArray("grass")
-forbidden_chunk_tags = PackedStringArray("spawn")
+forbidden_chunk_tags = PackedStringArray("spawn", "mixed_surface")
 region_weight = 1.2
 prop_rules = Array[ExtResource("2_rule")]([SubResource("Rule_grass_tree"), SubResource("Rule_grass_detail")])

world/generation/biomes/definitions/biome_plains.tres

@@ -24,5 +24,6 @@ script = ExtResource("1_definition")
 stable_id = &"biome_plains"
 label = "plains"
 required_chunk_tags = PackedStringArray("grass")
+forbidden_chunk_tags = PackedStringArray("mixed_surface")
 region_weight = 1.0
 prop_rules = Array[ExtResource("2_rule")]([SubResource("Rule_grass_tree"), SubResource("Rule_grass_detail")])

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+
+[params]
+
+compress/mode=2
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=0

world/generation/chunks/assets/chunk_0016_grass_lite.png.import

@@ -0,0 +1,45 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://dn84haedw08rx"
+path.s3tc="res://.godot/imported/chunk_0016_grass_lite.png-df65a0c79eb0a4e70a36096ead0f76f3.s3tc.ctex"
+path.etc2="res://.godot/imported/chunk_0016_grass_lite.png-df65a0c79eb0a4e70a36096ead0f76f3.etc2.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc", "etc2_astc"],
+"vram_texture": true
+}
+generator_parameters={
+"md5": "4dc1ac400d85d9b3e4f43a5af0a38ed4"
+}
+
+[deps]
+
+source_file="res://world/generation/chunks/assets/chunk_0016_grass_lite.png"
+dest_files=["res://.godot/imported/chunk_0016_grass_lite.png-df65a0c79eb0a4e70a36096ead0f76f3.s3tc.ctex", "res://.godot/imported/chunk_0016_grass_lite.png-df65a0c79eb0a4e70a36096ead0f76f3.etc2.ctex"]
+
+[params]
+
+compress/mode=2
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=0

world/generation/chunks/definitions/chunk_0003.tres

@@ -9,7 +9,7 @@ stable_id = &"chunk_0003"
 label = "stream"
 packed_scene = ExtResource("2_scene")
 primary_mesh_name = &"chunk_0003"
-selection_weight = 0.6
+selection_weight = 0.3
 tags = PackedStringArray("land", "walkable", "fresh_water", "river", "flowing")
 allowed_neighbor_tags = PackedStringArray("grass")
 preferred_neighbor_tags = PackedStringArray("grass")

world/generation/chunks/definitions/chunk_0013.tres

@@ -0,0 +1,28 @@
+[gd_resource type="Resource" script_class="TerrainChunkDefinition" load_steps=3 format=3]
+
+[ext_resource type="Script" path="res://world/generation/terrain_chunk_definition.gd" id="1_definition"]
+[ext_resource type="PackedScene" path="res://world/generation/chunks/assets/chunk_0013.glb" id="2_scene"]
+
+[resource]
+script = ExtResource("1_definition")
+stable_id = &"chunk_0013"
+label = "grass-sand diagonal"
+packed_scene = ExtResource("2_scene")
+primary_mesh_name = &"chunk_0013"
+participates_in_base_solver = false
+allowed_rotation_mask = 15
+selection_weight = 0.8
+maximum_placements = 16
+tags = PackedStringArray("land", "walkable", "grass", "sand", "flat", "transition", "mixed_surface")
+allowed_neighbor_tags = PackedStringArray("grass", "sand")
+forbidden_neighbor_tags = PackedStringArray("fresh_water", "spawn")
+north_allowed_neighbor_tags = PackedStringArray("sand")
+east_allowed_neighbor_tags = PackedStringArray("grass")
+south_allowed_neighbor_tags = PackedStringArray("grass")
+west_allowed_neighbor_tags = PackedStringArray("sand")
+north_surface_tags = PackedStringArray("sand")
+east_surface_tags = PackedStringArray("grass")
+south_surface_tags = PackedStringArray("grass")
+west_surface_tags = PackedStringArray("sand")
+preferred_neighbor_tags = PackedStringArray("grass", "sand", "transition")
+must_be_interior = true

world/generation/chunks/definitions/chunk_0014.tres

@@ -0,0 +1,24 @@
+[gd_resource type="Resource" script_class="TerrainChunkDefinition" load_steps=3 format=3]
+
+[ext_resource type="Script" path="res://world/generation/terrain_chunk_definition.gd" id="1_definition"]
+[ext_resource type="PackedScene" path="res://world/generation/chunks/assets/chunk_0014.glb" id="2_scene"]
+
+[resource]
+script = ExtResource("1_definition")
+stable_id = &"chunk_0014"
+label = "second-tier grass sea edge"
+packed_scene = ExtResource("2_scene")
+primary_mesh_name = &"chunk_0014"
+overlay_only = true
+selection_weight = 0.28
+maximum_placements = 32
+tags = PackedStringArray("land", "walkable", "grass", "coast", "cliff", "edge", "elevation_2", "elevation_2_border", "elevation_2_sea_edge")
+allowed_neighbor_tags = PackedStringArray("elevation_2")
+north_allowed_neighbor_tags = PackedStringArray("elevation_2_sea_edge")
+south_allowed_neighbor_tags = PackedStringArray("elevation_2_sea_edge")
+west_allowed_neighbor_tags = PackedStringArray("elevation_2_top")
+required_neighbor_tags = PackedStringArray("elevation_2_top")
+minimum_required_neighbors = 1
+preferred_neighbor_tags = PackedStringArray("elevation_2", "coast")
+prefers_map_boundary = true
+ocean_facing_edges = 2

world/generation/chunks/definitions/chunk_0015.tres

@@ -0,0 +1,23 @@
+[gd_resource type="Resource" script_class="TerrainChunkDefinition" load_steps=3 format=3]
+
+[ext_resource type="Script" path="res://world/generation/terrain_chunk_definition.gd" id="1_definition"]
+[ext_resource type="PackedScene" path="res://world/generation/chunks/assets/chunk_0015.glb" id="2_scene"]
+
+[resource]
+script = ExtResource("1_definition")
+stable_id = &"chunk_0015"
+label = "second-tier grass sea corner"
+packed_scene = ExtResource("2_scene")
+primary_mesh_name = &"chunk_0015"
+overlay_only = true
+selection_weight = 0.12
+maximum_placements = 16
+tags = PackedStringArray("land", "walkable", "grass", "coast", "cliff", "corner", "elevation_2", "elevation_2_border", "elevation_2_sea_edge")
+allowed_neighbor_tags = PackedStringArray("elevation_2")
+north_allowed_neighbor_tags = PackedStringArray("elevation_2_sea_edge")
+west_allowed_neighbor_tags = PackedStringArray("elevation_2_sea_edge")
+required_neighbor_tags = PackedStringArray("elevation_2_sea_edge")
+minimum_required_neighbors = 2
+preferred_neighbor_tags = PackedStringArray("elevation_2", "coast")
+prefers_map_boundary = true
+ocean_facing_edges = 6

world/generation/chunks/definitions/chunk_0016.tres

@@ -0,0 +1,19 @@
+[gd_resource type="Resource" script_class="TerrainChunkDefinition" format=3]
+
+[ext_resource type="Script" path="res://world/generation/terrain_chunk_definition.gd" id="1_definition"]
+[ext_resource type="PackedScene" path="res://world/generation/chunks/assets/chunk_0016.glb" id="2_scene"]
+
+[resource]
+script = ExtResource("1_definition")
+stable_id = &"chunk_0016"
+label = "stream variant"
+packed_scene = ExtResource("2_scene")
+primary_mesh_name = &"chunk_0016"
+selection_weight = 0.3
+tags = PackedStringArray("land", "walkable", "fresh_water", "river", "flowing")
+allowed_neighbor_tags = PackedStringArray("grass")
+preferred_neighbor_tags = PackedStringArray("grass")
+water_inlet_edges = 1
+water_outlet_edges = 4
+water_surface_size = Vector2(2.1, 10)
+water_surface_offset = Vector2(-0.315, 0)

world/generation/chunks/terrain_chunk_catalog.tres

@@ -1,4 +1,4 @@
-[gd_resource type="Resource" script_class="TerrainChunkCatalog" load_steps=17 format=3]
+[gd_resource type="Resource" script_class="TerrainChunkCatalog" load_steps=21 format=3]
 
 [ext_resource type="Script" path="res://world/generation/terrain_chunk_catalog.gd" id="1_catalog"]
 [ext_resource type="Resource" path="res://world/generation/chunks/definitions/chunk_0000.tres" id="2_grass"]
@@ -16,8 +16,12 @@
 [ext_resource type="Resource" path="res://world/generation/chunks/definitions/chunk_0010.tres" id="14_cliff_corner"]
 [ext_resource type="Resource" path="res://world/generation/chunks/definitions/chunk_0011.tres" id="15_cliff_edge"]
 [ext_resource type="Resource" path="res://world/generation/chunks/definitions/chunk_0012.tres" id="16_cliff_ramp"]
+[ext_resource type="Resource" path="res://world/generation/chunks/definitions/chunk_0013.tres" id="17_grass_sand_diagonal"]
+[ext_resource type="Resource" path="res://world/generation/chunks/definitions/chunk_0014.tres" id="18_cliff_sea_edge"]
+[ext_resource type="Resource" path="res://world/generation/chunks/definitions/chunk_0015.tres" id="19_cliff_sea_corner"]
+[ext_resource type="Resource" path="res://world/generation/chunks/definitions/chunk_0016.tres" id="20_stream_variant"]
 
 [resource]
 script = ExtResource("1_catalog")
 chunk_size = 10.0
-definitions = Array[ExtResource("7_definition_script")]([ExtResource("2_grass"), ExtResource("3_sand"), ExtResource("4_beach"), ExtResource("5_stream"), ExtResource("6_pond"), ExtResource("9_grass_ocean_edge"), ExtResource("10_grass_beach_transition"), ExtResource("11_grass_ocean_corner"), ExtResource("12_beach_ocean_corner"), ExtResource("13_cliff_top"), ExtResource("14_cliff_corner"), ExtResource("15_cliff_edge"), ExtResource("16_cliff_ramp"), ExtResource("8_spawn")])
+definitions = Array[ExtResource("7_definition_script")]([ExtResource("2_grass"), ExtResource("3_sand"), ExtResource("4_beach"), ExtResource("5_stream"), ExtResource("20_stream_variant"), ExtResource("6_pond"), ExtResource("9_grass_ocean_edge"), ExtResource("10_grass_beach_transition"), ExtResource("11_grass_ocean_corner"), ExtResource("12_beach_ocean_corner"), ExtResource("17_grass_sand_diagonal"), ExtResource("13_cliff_top"), ExtResource("14_cliff_corner"), ExtResource("15_cliff_edge"), ExtResource("16_cliff_ramp"), ExtResource("18_cliff_sea_edge"), ExtResource("19_cliff_sea_corner"), ExtResource("8_spawn")])

world/generation/generated_world_region.tscn

@@ -37,6 +37,7 @@ generate_on_ready = false
 build_collision = true
 force_center_chunk_id = &"chunk_spawn"
 required_chunk_ids = PackedStringArray("chunk_spawn", "chunk_0001", "chunk_0002", "chunk_0003", "chunk_0004", "chunk_0005", "chunk_0006", "chunk_0007", "chunk_0008")
+grass_sand_smoothing_enabled = true
 elevated_cliff_feature_enabled = true
 required_chunk_weight_multiplier = 64.0
 maximum_backtracks = 100000

world/generation/terrain_chunk_catalog.gd

@@ -38,10 +38,16 @@ func validation_errors() -> PackedStringArray:
 				"%s must define both base-layer scene and mesh name."
 				% definition.stable_id
 			)
-		if definition.overlay_only and definition.base_layer_scene == null:
+		if (
+			definition.overlay_only
+			and definition.base_layer_scene == null
+			and definition.ocean_facing_edges == 0
+		):
 			errors.append(
-				"%s is overlay-only but has no base-layer scene."
-				% definition.stable_id
+				(
+					"%s is an inland overlay but has no base-layer scene."
+					% definition.stable_id
+				)
 			)
 		if definition.allowed_rotation_mask == 0:
 			errors.append("%s allows no rotations." % definition.stable_id)

world/generation/terrain_chunk_definition.gd

@@ -12,9 +12,14 @@ extends Resource
 @export var base_layer_scene: PackedScene
 @export var base_layer_mesh_name: StringName
 ## Overlay-only chunks replace a reserved base-terrain placement after the
-## ordinary terrain solve. They remain in placement manifests and runtime
-## output, but do not inflate every cell's global solver domain.
+## ordinary terrain solve. Inland overlays normally provide base_layer_scene;
+## complete coastal overlays can instead carry their own descent to sea level.
+## They remain in placement manifests and runtime output, but do not inflate
+## every cell's global solver domain.
 @export var overlay_only := false
+## Post-process pieces remain available as authored variants and in placement
+## manifests, but do not participate in the ordinary base-terrain solve.
+@export var participates_in_base_solver := true
 @export_group("")
 @export_flags("0 degrees", "90 degrees", "180 degrees", "270 degrees")
 var allowed_rotation_mask := 15
@@ -38,6 +43,16 @@ var allowed_rotation_mask := 15
 @export var south_allowed_neighbor_tags := PackedStringArray()
 @export var west_allowed_neighbor_tags := PackedStringArray()
 @export_group("")
+## Optional canonical descriptions of the visible terrain surface at each
+## edge. Empty edges inherit the definition's ordinary tags. Mixed-surface
+## chunks use these to prevent a visually grass edge from joining sand (or the
+## reverse) even when the chunk itself carries both biome tags.
+@export_group("Directional Surface Rules")
+@export var north_surface_tags := PackedStringArray()
+@export var east_surface_tags := PackedStringArray()
+@export var south_surface_tags := PackedStringArray()
+@export var west_surface_tags := PackedStringArray()
+@export_group("")
 ## When non-empty, at least this many in-grid cardinal neighbors must carry one
 ## of the listed tags. This supports statements such as "three sides around the
 ## spawn must be safe grass" without hard-coding a particular chunk ID.
@@ -106,6 +121,28 @@ func directional_allowed_neighbor_tags(
 	return PackedStringArray()
 
 
+func surface_tags_for_edge(
+	edge: TerrainChunkTopology.Edge,
+) -> PackedStringArray:
+	var edge_tags := directional_surface_tags(edge)
+	return tags if edge_tags.is_empty() else edge_tags
+
+
+func directional_surface_tags(
+	edge: TerrainChunkTopology.Edge,
+) -> PackedStringArray:
+	match edge:
+		TerrainChunkTopology.Edge.NORTH:
+			return north_surface_tags
+		TerrainChunkTopology.Edge.EAST:
+			return east_surface_tags
+		TerrainChunkTopology.Edge.SOUTH:
+			return south_surface_tags
+		TerrainChunkTopology.Edge.WEST:
+			return west_surface_tags
+	return PackedStringArray()
+
+
 func _allows_neighbor_with_tags(
 	neighbor: TerrainChunkDefinition,
 	allowed_tags: PackedStringArray,

world/generation/terrain_chunk_variant.gd

@@ -35,6 +35,10 @@ func allows_non_water_neighbor_on_edge(
 	)
 
 
+func surface_tags(edge: TerrainChunkTopology.Edge) -> PackedStringArray:
+	return definition.surface_tags_for_edge(source_edge(edge))
+
+
 func topology_signature(quantization: float) -> String:
 	var tokens := PackedStringArray()
 	for edge_value: int in TerrainChunkTopology.Edge.values():
@@ -44,9 +48,10 @@ func topology_signature(quantization: float) -> String:
 
 
 func constraint_signature(quantization: float) -> String:
-	return "%s|neighbors:%s|ocean:%d|in:%d|out:%d" % [
+	return "%s|neighbors:%s|surfaces:%s|ocean:%d|in:%d|out:%d" % [
 		topology_signature(quantization),
 		_neighbor_rule_signature(),
+		_surface_rule_signature(),
 		rotated_edge_mask(definition.ocean_facing_edges),
 		rotated_edge_mask(definition.water_inlet_edges),
 		rotated_edge_mask(definition.water_outlet_edges),
@@ -65,6 +70,16 @@ func _neighbor_rule_signature() -> String:
 	return "/".join(edge_tokens)
 
 
+func _surface_rule_signature() -> String:
+	var edge_tokens := PackedStringArray()
+	for edge_value: int in TerrainChunkTopology.Edge.values():
+		var edge := edge_value as TerrainChunkTopology.Edge
+		var edge_tags: PackedStringArray = surface_tags(edge).duplicate()
+		edge_tags.sort()
+		edge_tokens.append(",".join(edge_tags))
+	return "/".join(edge_tokens)
+
+
 func rotated_edge_mask(source_mask: int) -> int:
 	var result := 0
 	for edge_value: int in TerrainChunkTopology.Edge.values():