Island modelling rework with vertex fixes

README.md

@@ -38,6 +38,32 @@ scripts/run_validations.sh quick
 Additional suites and individual commands are documented in
 [`docs/TESTING.md`](docs/TESTING.md).
 
+## Texture import normalization
+
+Texture import settings are cached in `.import` sidecars. To keep new textures
+consistent by default, normalize imported textures before committing:
+
+```sh
+./scripts/normalize_texture_profiles.sh
+```
+
+To normalize only a specific directory (for example environment textures):
+
+```sh
+./scripts/normalize_texture_profiles.sh res://art/exported/environment/textures
+```
+
+The script enforces a single baseline texture profile by default and sets
+`import_profile = "managed_default"` in `[params]`. If any texture needs
+custom settings, set:
+
+```ini
+[params]
+import_profile="custom"
+```
+
+in its `.import` file to opt it out.
+
 ## Building
 
 Export presets are maintained for Linux, Windows, and Android. Repository

art/exported/environment/textures/cliff_wall.png.import

@@ -15,7 +15,7 @@ dest_files=["res://.godot/imported/cliff_wall.png-7ce756d49c24c7b8fdda307d68086d
 
 [params]
 
-compress/mode=0
+compress/mode=2
 compress/high_quality=false
 compress/lossy_quality=0.7
 compress/uastc_level=0
@@ -23,7 +23,7 @@ compress/rdo_quality_loss=0.0
 compress/hdr_compression=1
 compress/normal_map=0
 compress/channel_pack=0
-mipmaps/generate=false
+mipmaps/generate=true
 mipmaps/limit=-1
 roughness/mode=0
 roughness/src_normal=""
@@ -37,4 +37,5 @@ process/normal_map_invert_y=false
 process/hdr_as_srgb=false
 process/hdr_clamp_exposure=false
 process/size_limit=0
-detect_3d/compress_to=1
+detect_3d/compress_to=0
+import_profile="managed_default"

art/exported/environment/textures/dirt.png.import

@@ -0,0 +1,41 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://b2ce1ikmnbktx"
+path="res://.godot/imported/dirt.png-ca5bf3f3fbf583edaa719ac8c686549d.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://art/exported/environment/textures/dirt.png"
+dest_files=["res://.godot/imported/dirt.png-ca5bf3f3fbf583edaa719ac8c686549d.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=true
+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
+import_profile="managed_default"

art/exported/environment/textures/dirt_light_wall.png.import

@@ -0,0 +1,41 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://dtv2k327higrb"
+path="res://.godot/imported/dirt_light_wall.png-40336902aac8516f68e99f8e8988d86f.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://art/exported/environment/textures/dirt_light_wall.png"
+dest_files=["res://.godot/imported/dirt_light_wall.png-40336902aac8516f68e99f8e8988d86f.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=true
+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
+import_profile="managed_default"

art/exported/environment/textures/dirt_wall.png.import

@@ -15,7 +15,7 @@ dest_files=["res://.godot/imported/dirt_wall.png-8ba7bb24831d83f929bfa44b53af928
 
 [params]
 
-compress/mode=0
+compress/mode=2
 compress/high_quality=false
 compress/lossy_quality=0.7
 compress/uastc_level=0
@@ -23,7 +23,7 @@ compress/rdo_quality_loss=0.0
 compress/hdr_compression=1
 compress/normal_map=0
 compress/channel_pack=0
-mipmaps/generate=false
+mipmaps/generate=true
 mipmaps/limit=-1
 roughness/mode=0
 roughness/src_normal=""
@@ -37,4 +37,5 @@ process/normal_map_invert_y=false
 process/hdr_as_srgb=false
 process/hdr_clamp_exposure=false
 process/size_limit=0
-detect_3d/compress_to=1
+detect_3d/compress_to=0
+import_profile="managed_default"

art/exported/environment/textures/grass.png.import

@@ -15,7 +15,7 @@ dest_files=["res://.godot/imported/grass.png-4d1108b11a421d9c16bd72fb0bc993d3.ct
 
 [params]
 
-compress/mode=0
+compress/mode=2
 compress/high_quality=false
 compress/lossy_quality=0.7
 compress/uastc_level=0
@@ -23,7 +23,7 @@ compress/rdo_quality_loss=0.0
 compress/hdr_compression=1
 compress/normal_map=0
 compress/channel_pack=0
-mipmaps/generate=false
+mipmaps/generate=true
 mipmaps/limit=-1
 roughness/mode=0
 roughness/src_normal=""
@@ -37,4 +37,5 @@ process/normal_map_invert_y=false
 process/hdr_as_srgb=false
 process/hdr_clamp_exposure=false
 process/size_limit=0
-detect_3d/compress_to=1
+detect_3d/compress_to=0
+import_profile="managed_default"

art/exported/environment/textures/grass_heavy.png.import

@@ -15,7 +15,7 @@ dest_files=["res://.godot/imported/grass_heavy.png-ba7f679d1bc5402f8b0a3465ac6a4
 
 [params]
 
-compress/mode=0
+compress/mode=2
 compress/high_quality=false
 compress/lossy_quality=0.7
 compress/uastc_level=0
@@ -23,7 +23,7 @@ compress/rdo_quality_loss=0.0
 compress/hdr_compression=1
 compress/normal_map=0
 compress/channel_pack=0
-mipmaps/generate=false
+mipmaps/generate=true
 mipmaps/limit=-1
 roughness/mode=0
 roughness/src_normal=""
@@ -37,4 +37,5 @@ process/normal_map_invert_y=false
 process/hdr_as_srgb=false
 process/hdr_clamp_exposure=false
 process/size_limit=0
-detect_3d/compress_to=1
+detect_3d/compress_to=0
+import_profile="managed_default"

art/exported/environment/textures/grass_lite.png.import

@@ -40,3 +40,4 @@ process/hdr_as_srgb=false
 process/hdr_clamp_exposure=false
 process/size_limit=0
 detect_3d/compress_to=0
+import_profile="managed_default"

art/exported/environment/textures/grass_olive_tile.png.import

@@ -40,3 +40,4 @@ process/hdr_as_srgb=false
 process/hdr_clamp_exposure=false
 process/size_limit=0
 detect_3d/compress_to=0
+import_profile="managed_default"

art/exported/environment/textures/sand.png.import

@@ -40,3 +40,4 @@ process/hdr_as_srgb=false
 process/hdr_clamp_exposure=false
 process/size_limit=0
 detect_3d/compress_to=0
+import_profile="managed_default"

art/exported/environment/textures/sand_dark.png.import

@@ -0,0 +1,41 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://cyukfgkghrigk"
+path="res://.godot/imported/sand_dark.png-ab4ec28097312f566fe7b882978a5858.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://art/exported/environment/textures/sand_dark.png"
+dest_files=["res://.godot/imported/sand_dark.png-ab4ec28097312f566fe7b882978a5858.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=true
+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
+import_profile="managed_default"

art/exported/environment/textures/sand_lite.png.import

@@ -0,0 +1,41 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://whknttjshvv1"
+path="res://.godot/imported/sand_lite.png-6962f2117f97a265a7074c81ef2370fa.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://art/exported/environment/textures/sand_lite.png"
+dest_files=["res://.godot/imported/sand_lite.png-6962f2117f97a265a7074c81ef2370fa.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=true
+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
+import_profile="managed_default"

art/exported/environment/textures/sandstone_heavy.png.import

@@ -0,0 +1,43 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://ctll4fbskvat8"
+path.s3tc="res://.godot/imported/sandstone_heavy.png-c324c68e8c28417ecd3506dbd5f24ef5.s3tc.ctex"
+path.etc2="res://.godot/imported/sandstone_heavy.png-c324c68e8c28417ecd3506dbd5f24ef5.etc2.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc", "etc2_astc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://art/exported/environment/textures/sandstone_heavy.png"
+dest_files=["res://.godot/imported/sandstone_heavy.png-c324c68e8c28417ecd3506dbd5f24ef5.s3tc.ctex", "res://.godot/imported/sandstone_heavy.png-c324c68e8c28417ecd3506dbd5f24ef5.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=true
+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
+import_profile="managed_default"

art/exported/environment/textures/sandstone_lite.png.import

@@ -0,0 +1,41 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://bgbaiuts1c4sb"
+path="res://.godot/imported/sandstone_lite.png-8d5c0c5c4e3a227e0e487db42a418aba.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://art/exported/environment/textures/sandstone_lite.png"
+dest_files=["res://.godot/imported/sandstone_lite.png-8d5c0c5c4e3a227e0e487db42a418aba.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=true
+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
+import_profile="managed_default"

scripts/normalize_texture_imports.gd

@@ -0,0 +1,212 @@
+extends SceneTree
+
+const DEFAULT_PROFILE: Dictionary = {
+	"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": true,
+		"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,
+		"import_profile": "managed_default",
+	},
+}
+
+const CUSTOM_PROFILE_KEY := "custom"
+
+var apply_changes := false
+var verbose := false
+var roots: PackedStringArray = PackedStringArray()
+var user_root_overrides := false
+var should_exit := false
+
+var skipped_custom := 0
+var skipped_non_texture := 0
+var skipped_unreadable := 0
+var updated := 0
+var unchanged := 0
+
+func _initialize() -> void:
+	_parse_args()
+	if should_exit:
+		return
+	if roots.is_empty() and not user_root_overrides:
+		roots.append("res://")
+
+	for root: String in roots:
+		var normalized_root := root
+		if not normalized_root.ends_with("/"):
+			normalized_root += "/"
+		if not normalized_root.begins_with("res://") and not normalized_root.is_absolute_path():
+			if normalized_root.begins_with("./"):
+				normalized_root = "res://%s" % normalized_root.trim_prefix("./")
+			else:
+				normalized_root = "res://%s" % normalized_root
+		_print("Scanning %s" % normalized_root)
+		_scan_directory(normalized_root)
+
+	print_summary()
+	quit(0)
+
+
+func _parse_args() -> void:
+	var args := OS.get_cmdline_user_args()
+	var i := 0
+	while i < args.size():
+		var arg := args[i]
+		if arg == "--help" or arg == "-h":
+			_print_usage()
+			should_exit = true
+			quit(0)
+			return
+		elif arg == "--apply":
+			apply_changes = true
+			i += 1
+		elif arg == "--verbose" or arg == "-v":
+			verbose = true
+			i += 1
+		elif arg == "--root":
+			if i + 1 >= args.size():
+				printerr("--root requires a path value")
+				should_exit = true
+				quit(1)
+				return
+			i += 1
+			roots.append(args[i])
+			i += 1
+			user_root_overrides = true
+		elif arg.begins_with("--root="):
+			roots.append(arg.trim_prefix("--root="))
+			i += 1
+			user_root_overrides = true
+		else:
+			if arg.begins_with("-"):
+				_print("Ignoring unknown option: %s" % arg)
+			i += 1
+			continue
+
+
+func _scan_directory(path: String) -> void:
+	var dir := DirAccess.open(path)
+	if dir == null:
+		printerr("Failed to open root: ", path)
+		skipped_non_texture += 1
+		return
+
+	dir.list_dir_begin()
+	while true:
+		var name := dir.get_next()
+		if name.is_empty():
+			break
+		if name == "." or name == "..":
+			continue
+		if name == ".godot":
+			continue
+
+		var candidate := path.path_join(name)
+		if dir.current_is_dir():
+			_scan_directory(candidate)
+			continue
+
+		if name.get_extension().to_lower() != "import":
+			continue
+
+		_handle_import_file(candidate)
+
+
+func _handle_import_file(import_path: String) -> void:
+	var cfg := ConfigFile.new()
+	var err := cfg.load(import_path)
+	if err != OK:
+		printerr("Could not load import settings: ", import_path, " (", err, ")")
+		skipped_unreadable += 1
+		return
+
+	if not cfg.has_section("remap") or not cfg.has_section_key("remap", "importer"):
+		skipped_non_texture += 1
+		return
+
+	if str(cfg.get_value("remap", "importer")) != "texture":
+		skipped_non_texture += 1
+		return
+
+	var current_profile := ""
+	if cfg.has_section("params") and cfg.has_section_key("params", "import_profile"):
+		current_profile = str(cfg.get_value("params", "import_profile"))
+	if current_profile == CUSTOM_PROFILE_KEY:
+		skipped_custom += 1
+		if verbose:
+			_print("Skipping custom profile: %s" % import_path)
+		return
+
+	var changed := false
+	for section_name: String in DEFAULT_PROFILE.keys():
+		var section_data: Dictionary = DEFAULT_PROFILE[section_name]
+		for section_key: String in section_data.keys():
+			var desired: Variant = section_data[section_key]
+			var existing: Variant = null
+			if cfg.has_section(section_name) and cfg.has_section_key(section_name, section_key):
+				existing = cfg.get_value(section_name, section_key)
+			if existing != desired:
+				cfg.set_value(section_name, section_key, desired)
+				changed = true
+
+	if not changed:
+		unchanged += 1
+		if verbose:
+			_print("Unchanged: %s" % import_path)
+		return
+
+	if apply_changes:
+		err = cfg.save(import_path)
+		if err != OK:
+			printerr("Could not save import settings: ", import_path, " (", err, ")")
+			skipped_unreadable += 1
+			return
+		if verbose:
+			_print("Updated: %s" % import_path)
+	else:
+		_print("Would update: %s" % import_path)
+
+	updated += 1
+
+
+func print_summary() -> void:
+	if apply_changes:
+		_print("Texture import normalization complete: updated=%d unchanged=%d skipped_custom=%d skipped_non_texture=%d skipped_unreadable=%d" % [updated, unchanged, skipped_custom, skipped_non_texture, skipped_unreadable])
+	else:
+		_print("Dry-run complete: would-update=%d unchanged=%d skipped_custom=%d skipped_non_texture=%d skipped_unreadable=%d" % [updated, unchanged, skipped_custom, skipped_non_texture, skipped_unreadable])
+		_print("Pass --apply to write normalized settings into .import files.")
+		_print("Set [params] import_profile = \"custom\" to opt a texture out of default normalization.")
+
+
+func _print(msg: String) -> void:
+	print(msg)
+
+
+func _print_usage() -> void:
+	print("Usage:")
+	print("  godot --headless --path . --script scripts/normalize_texture_imports.gd [--apply] [--verbose] [--root <path>] [--root=<path>] [--help]")
+	print()
+	print("Defaults:")
+	print("- Dry-run only unless --apply is provided")
+	print("- Scans all .import files under each root")
+	print("- Skips .godot")
+	print("- Skips textures marked with [params] import_profile = \"custom\"")

scripts/normalize_texture_imports.gd.uid

@@ -0,0 +1 @@
+uid://b24mlapvqxj5a

scripts/normalize_texture_profiles.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+readonly SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+readonly PROJECT_ROOT="$(cd -- "${SCRIPT_DIR}/.." && pwd)"
+readonly GODOT_BIN="${GODOT_BIN:-godot}"
+readonly ROOT_PATH="${1:-res://}"
+
+readonly WORK_ROOT="$(mktemp -d -t netfishing-godot-data.XXXXXX)"
+trap 'rm -rf -- "${WORK_ROOT}"' EXIT
+
+cd "${PROJECT_ROOT}"
+
+XDG_DATA_HOME="${WORK_ROOT}/data" \
+XDG_CONFIG_HOME="${WORK_ROOT}/config" \
+XDG_CACHE_HOME="${WORK_ROOT}/cache" \
+${GODOT_BIN} --headless --path . \
+	--script scripts/normalize_texture_imports.gd -- --apply --root "${ROOT_PATH}"

world/materials/starter_island_sandstone.tres

@@ -0,0 +1,15 @@
+[gd_resource type="ShaderMaterial" load_steps=3 format=3]
+
+[ext_resource type="Texture2D" path="res://art/exported/environment/textures/sandstone_heavy.png" id="1_texture"]
+[ext_resource type="Shader" path="res://world/materials/terrain_surface_projection.gdshader" id="2_shader"]
+
+[resource]
+resource_name = "Starter Island Sandstone"
+shader = ExtResource("2_shader")
+shader_parameter/albedo_texture = ExtResource("1_texture")
+shader_parameter/albedo_tint = Color(1, 1, 1, 1)
+shader_parameter/tile_world_size = 2.5
+shader_parameter/blend_sharpness = 6.0
+shader_parameter/top_projection_bias = 2.0
+shader_parameter/roughness = 1.0
+shader_parameter/specular = 0.0

world/regions/starter_island_region.gd

@@ -7,6 +7,7 @@ const FishingShopInteractionType = preload(
 )
 const GRASS_SURFACE_NAME: String = "grass_lite"
 const SAND_SURFACE_NAME: String = "sand"
+const SANDSTONE_SURFACE_NAME: String = "sandstone_heavy"
 
 @export_group("Owned Nodes")
 @export_node_path("MeshInstance3D")
@@ -31,17 +32,24 @@ var pelican_landmark_path: NodePath = (
 )
 
 @export_group("Grass Surface")
+@export var apply_surface_overrides: bool = true
 @export var grass_material: Material
 @export_range(0, 16, 1) var grass_surface_index: int = 0
 
 @export_group("Sand Surface")
 @export var sand_material: Material
-@export_range(0, 16, 1) var sand_surface_index: int = 2
+@export_range(0, 16, 1) var sand_surface_index: int = 4
+
+@export_group("Sandstone Surface")
+@export var sandstone_material: Material
+@export_range(0, 16, 1) var sandstone_surface_index: int = 5
 
 
 func _ready() -> void:
-	_apply_grass_material()
+	if apply_surface_overrides:
-	_apply_sand_material()
+		_apply_grass_material()
+		_apply_sand_material()
+		_apply_sandstone_material()
 	_build_terrain_collision()
 	if Engine.is_editor_hint():
 		update_configuration_warnings()
@@ -121,6 +129,31 @@ func _apply_sand_material() -> void:
 	)
 
 
+func _apply_sandstone_material() -> void:
+	var visual_mesh: MeshInstance3D = (
+		get_node_or_null(visual_mesh_path) as MeshInstance3D
+	)
+	if visual_mesh == null or visual_mesh.mesh == null:
+		push_error("Starter island visual mesh is unavailable.")
+		return
+	if sandstone_material == null:
+		push_error("Starter island sandstone material is unavailable.")
+		return
+	if sandstone_surface_index >= visual_mesh.mesh.get_surface_count():
+		push_error("Starter island sandstone surface index is invalid.")
+		return
+	if (
+		visual_mesh.mesh.surface_get_name(sandstone_surface_index)
+		!= SANDSTONE_SURFACE_NAME
+	):
+		push_error("Starter island sandstone surface name does not match.")
+		return
+	visual_mesh.set_surface_override_material(
+		sandstone_surface_index,
+		sandstone_material
+	)
+
+
 func _build_terrain_collision() -> void:
 	var terrain_root: Node = get_node_or_null(terrain_visual_root_path)
 	if terrain_root == null:
@@ -183,16 +216,19 @@ func _get_configuration_warnings() -> PackedStringArray:
 		return warnings
 	if visual_mesh == null or visual_mesh.mesh == null:
 		warnings.append("Terrain/Visual must provide the island mesh.")
-	elif grass_surface_index >= visual_mesh.mesh.get_surface_count():
+		return warnings
-		warnings.append("Grass surface index is outside the terrain mesh.")
+
-	elif (
+	if apply_surface_overrides:
-		visual_mesh.mesh.surface_get_name(grass_surface_index)
+		if grass_surface_index >= visual_mesh.mesh.get_surface_count():
-		!= GRASS_SURFACE_NAME
+			warnings.append("Grass surface index is outside the terrain mesh.")
-	):
+		elif (
-		warnings.append("Grass surface index must identify the grass surface.")
+			visual_mesh.mesh.surface_get_name(grass_surface_index)
-	if grass_material == null:
+			!= GRASS_SURFACE_NAME
-		warnings.append("Assign the starter-island grass material.")
+		):
-	if visual_mesh != null and visual_mesh.mesh != null:
+			warnings.append("Grass surface index must identify the grass surface.")
+		if grass_material == null:
+			warnings.append("Assign the starter-island grass material.")
+
 		if sand_surface_index >= visual_mesh.mesh.get_surface_count():
 			warnings.append("Sand surface index is outside the terrain mesh.")
 		elif (
@@ -200,8 +236,21 @@ func _get_configuration_warnings() -> PackedStringArray:
 			!= SAND_SURFACE_NAME
 		):
 			warnings.append("Sand surface index must identify the sand surface.")
-	if sand_material == null:
+		if sand_material == null:
-		warnings.append("Assign the starter-island sand material.")
+			warnings.append("Assign the starter-island sand material.")
+		if sandstone_surface_index >= visual_mesh.mesh.get_surface_count():
+			warnings.append(
+				"Sandstone surface index is outside the terrain mesh."
+			)
+		elif (
+			visual_mesh.mesh.surface_get_name(sandstone_surface_index)
+			!= SANDSTONE_SURFACE_NAME
+		):
+			warnings.append(
+				"Sandstone surface index must identify the sandstone surface."
+			)
+		if sandstone_material == null:
+			warnings.append("Assign the starter-island sandstone material.")
 	if get_node_or_null(terrain_collision_shape_path) == null:
 		warnings.append("Terrain/Collision must provide a collision shape.")
 	if get_node_or_null(terrain_visual_root_path) == null:

world/regions/starter_island_region.tscn

@@ -12,6 +12,7 @@
 [ext_resource type="Material" path="res://world/materials/starter_island_grass.tres" id="9_grass"]
 [ext_resource type="Script" uid="uid://dtcgnxl1kmdu1" path="res://world/water_body_authoring.gd" id="10_water_body"]
 [ext_resource type="Material" path="res://world/materials/starter_island_sand.tres" id="11_sand"]
+[ext_resource type="Material" path="res://world/materials/starter_island_sandstone.tres" id="20_sandstone"]
 [ext_resource type="Material" path="res://world/materials/stylized_water.tres" id="13_water"]
 [ext_resource type="Script" path="res://world/water/shoreline_ribbon_baker.gd" id="14_shoreline_baker"]
 [ext_resource type="Script" path="res://world/water/shoreline_ribbon_config.gd" id="15_shoreline_config"]
@@ -91,8 +92,12 @@ output_resource_path = "res://world/generated/shorelines/starter_ocean_shoreline
 
 [node name="StarterIslandRegion" type="Node3D" unique_id=1830415700]
 script = ExtResource("1_region")
+apply_surface_overrides = true
 grass_material = ExtResource("9_grass")
+sand_surface_index = 4
 sand_material = ExtResource("11_sand")
+sandstone_material = ExtResource("20_sandstone")
+sandstone_surface_index = 5
 region_id = &"starter_island"
 fishable_water_root = NodePath("WaterBodies")
 water_recovery_root = NodePath("WaterBodies")