game/composition/vertical_slice/sunlit_shallows_world.tscn

@@ -0,0 +1,28 @@
+[gd_scene load_steps=5 format=3]
+
+[ext_resource type="PackedScene" path="res://game/world/sites/sunlit_shallows_environment.tscn" id="1_environment"]
+[ext_resource type="PackedScene" path="res://game/world/submarine/submarine_actor.tscn" id="2_submarine"]
+[ext_resource type="PackedScene" path="res://game/presentation/cockpit/cockpit_camera_rig.tscn" id="3_camera"]
+[ext_resource type="PackedScene" path="res://game/presentation/cockpit/cockpit_interior.tscn" id="4_cockpit"]
+
+[node name="SunlitShallowsWorld" type="Node3D"]
+
+[node name="Environment" parent="." instance=ExtResource("1_environment")]
+
+[node name="SubmarineActor" parent="." instance=ExtResource("2_submarine")]
+unique_name_in_owner = true
+position = Vector3(0, -30, 0)
+
+[node name="CockpitInterior" parent="SubmarineActor" instance=ExtResource("4_cockpit")]
+unique_name_in_owner = true
+
+[node name="CockpitCameraRig" parent="SubmarineActor" instance=ExtResource("3_camera")]
+unique_name_in_owner = true
+
+[node name="LeftProjector" parent="SubmarineActor" index="0"]
+light_energy = 3.0
+light_volumetric_fog_energy = 0.15
+
+[node name="RightProjector" parent="SubmarineActor" index="1"]
+light_energy = 3.0
+light_volumetric_fog_energy = 0.15

game/presentation/cockpit/cockpit_detailing.gd

@@ -108,6 +108,10 @@ func practical_light_count() -> int:
 	return 0 if _practical_lighting == null else _practical_lighting.practical_light_count()
 
 
+func fill_light_ignores_porthole_glass() -> bool:
+	return _practical_lighting != null and _practical_lighting.fill_light_ignores_porthole_glass()
+
+
 func gauges_are_dashboard_mounted() -> bool:
 	return _analog_gauges != null and _analog_gauges.get_parent() == get_parent().get_node("Dashboard")
 

game/presentation/cockpit/cockpit_practical_lighting.gd

@@ -9,6 +9,10 @@ const CockpitMeshFactory = preload(
 	"res://game/presentation/cockpit/cockpit_mesh_factory.gd"
 )
 
+const CockpitPressureBulkhead = preload(
+	"res://game/presentation/cockpit/cockpit_pressure_bulkhead.gd"
+)
+
 const CAGE_LAMP_SCENE = preload("res://game/presentation/cockpit/assets/models/cage_lamp.glb")
 
 ## Flange centre of the right-hand lamp, on the flat end cap of the pressure
@@ -34,6 +38,7 @@ const WARM_LAMP_SHADOW_BIAS := 0.03
 var _materials: CockpitMaterialPalette
 var _warm_lights: Array[OmniLight3D] = []
 var _emergency_light: OmniLight3D
+var _porthole_fill: OmniLight3D
 
 
 func _init(materials: CockpitMaterialPalette) -> void:
@@ -103,7 +108,20 @@ func _add_fill_light() -> void:
 	porthole_fill.light_energy = 1.0
 	porthole_fill.omni_range = 1.1
 	porthole_fill.shadow_enabled = false
+	# 30 cm behind the glass, it would mirror itself as a hard blue point.
+	porthole_fill.light_cull_mask &= ~CockpitPressureBulkhead.PORTHOLE_GLASS_RENDER_LAYER_BIT
 	add_child(porthole_fill)
+	_porthole_fill = porthole_fill
+
+
+func fill_light_ignores_porthole_glass() -> bool:
+	return (
+		_porthole_fill != null
+		and (
+			_porthole_fill.light_cull_mask
+			& CockpitPressureBulkhead.PORTHOLE_GLASS_RENDER_LAYER_BIT
+		) == 0
+	)
 
 
 func _add_emergency_light() -> void:

game/presentation/cockpit/cockpit_pressure_bulkhead.gd

@@ -4,6 +4,18 @@ extends Node3D
 ## Imported pressure hull (end cap, knuckle and barrel in one shell) and the
 ## porthole bolted into it. Both models are instanced by `cockpit_interior.tscn`.
 
+## The porthole glass lives alone on render layer 2 so interior lights that
+## sit right behind it (the cool porthole fill) can leave it out of their cull
+## mask instead of mirroring themselves as a hard specular point.
+const PORTHOLE_GLASS_RENDER_LAYER_BIT := 1 << 1
+## Imported glass is near-mirror smooth; a little roughness turns the remaining
+## lamp reflections into soft smears rather than pinpoints.
+const PORTHOLE_GLASS_ROUGHNESS := 0.45
+
+const CockpitMeshFactory = preload(
+	"res://game/presentation/cockpit/cockpit_mesh_factory.gd"
+)
+
 const WHITEBOX_NAMES: Array[String] = [
 	"LeftBulkhead",
 	"RightBulkhead",
@@ -26,6 +38,21 @@ func _ready() -> void:
 		push_error("Pressure hull or porthole model is missing a node")
 		return
 	_porthole_glass.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
+	_porthole_glass.layers = PORTHOLE_GLASS_RENDER_LAYER_BIT
+	var glass_material := CockpitMeshFactory.own_surface_material(_porthole_glass)
+	if glass_material != null:
+		glass_material.roughness = PORTHOLE_GLASS_ROUGHNESS
+
+
+func glass_is_on_dedicated_layer() -> bool:
+	return _porthole_glass != null and _porthole_glass.layers == PORTHOLE_GLASS_RENDER_LAYER_BIT
+
+
+func glass_roughness() -> float:
+	if _porthole_glass == null:
+		return 0.0
+	var material := _porthole_glass.get_active_material(0) as BaseMaterial3D
+	return 0.0 if material == null else material.roughness
 
 
 func panel_count() -> int:

game/world/sites/sunlit_shallows_caustic_floor.gdshader

@@ -0,0 +1,28 @@
+// Flat sandy floor with slowly drifting caustic lines. The pattern is purely
+// presentational and time-driven by the shader clock; no gameplay reads it.
+shader_type spatial;
+
+uniform vec3 sand_color : source_color = vec3(0.34, 0.32, 0.25);
+uniform vec3 caustic_tint : source_color = vec3(0.55, 0.82, 0.92);
+uniform sampler2D caustic_noise : repeat_enable, filter_linear_mipmap;
+uniform float caustic_scale = 0.055;
+uniform float caustic_speed = 0.018;
+uniform float caustic_strength : hint_range(0.0, 2.0) = 0.25;
+
+varying vec2 world_xz;
+
+void vertex() {
+	world_xz = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xz;
+}
+
+void fragment() {
+	vec2 drift_a = TIME * caustic_speed * vec2(1.0, 0.6);
+	vec2 drift_b = TIME * caustic_speed * vec2(-0.7, 1.0);
+	float layer_a = texture(caustic_noise, world_xz * caustic_scale + drift_a).r;
+	float layer_b = texture(caustic_noise, world_xz * caustic_scale * 1.35 + drift_b).r;
+	float caustic = pow(clamp(min(layer_a, layer_b) * 1.9, 0.0, 1.0), 4.0);
+	ALBEDO = sand_color;
+	ROUGHNESS = 0.95;
+	METALLIC = 0.0;
+	EMISSION = caustic_tint * caustic * caustic_strength;
+}

game/world/sites/sunlit_shallows_environment.gd

@@ -0,0 +1,161 @@
+class_name SunlitShallowsEnvironment
+extends Node3D
+
+## Visual test site: flat floor, calm water, fixed daytime sun.
+## The hour never changes, so the sun transform is a constant and the only
+## motion is the slow ripple drift inside the two shaders.
+
+const SURFACE_LEVEL_M := 0.0
+const FLOOR_DEPTH_M := -40.0
+## Air above the calm surface holds no scattering medium: a subtractive
+## FogVolume cancels the global volumetric fog there so the view never shows
+## an unshadowed glow above the water.
+const AIR_VOLUME_HEIGHT_M := 80.0
+const VOLUMETRIC_FOG_DENSITY := 0.035
+const SITE_EXTENT_M := 240.0
+## Sun sits ahead of the observer (world -Z) and high: shafts travel down
+## toward the submarine, as in the cockpit visual target.
+const SUN_ROTATION_DEGREES := Vector3(-44.0, 162.0, 0.0)
+const NOISE_SEED := 7
+## Calm water: ripple drift stays well under 0.05 texture units per second.
+const SURFACE_DRIFT_SPEED := 0.012
+## Sunlight only breaks through a pool of surface a few tens of metres ahead of
+## the submarine (world -Z), so the shafts land in front of the porthole.
+const SHAFT_POOL_CENTER_XZ_M := Vector2(-14.0, -31.0)
+const SHAFT_POOL_RADIUS_M := 22.0
+const SHAFT_POOL_EDGE_M := 12.0
+## Coarser ripples give a few broken oblique shafts rather than a dense fan.
+const SURFACE_RIPPLE_SCALE := 0.025
+## The underside of the surface is drawn dark, lit only inside the pool.
+const SURFACE_CEILING_LIT_SCALE := 0.3
+
+const SURFACE_OCCLUDER_SHADER := preload(
+	"res://game/world/sites/sunlit_shallows_surface_occluder.gdshader"
+)
+const CAUSTIC_FLOOR_SHADER := preload(
+	"res://game/world/sites/sunlit_shallows_caustic_floor.gdshader"
+)
+const SURFACE_CEILING_SHADER := preload(
+	"res://game/world/sites/sunlit_shallows_surface_ceiling.gdshader"
+)
+
+
+func _ready() -> void:
+	_fix_sun()
+	_add_flat_floor()
+	_add_surface_occluder()
+	_add_surface_ceiling()
+	_add_air_fog_cut()
+
+
+func _fix_sun() -> void:
+	var sun := get_node_or_null("Sun") as DirectionalLight3D
+	if sun == null:
+		return
+	sun.rotation_degrees = SUN_ROTATION_DEGREES
+
+
+func _add_flat_floor() -> void:
+	var plane := PlaneMesh.new()
+	plane.size = Vector2(SITE_EXTENT_M, SITE_EXTENT_M)
+	plane.subdivide_width = 1
+	plane.subdivide_depth = 1
+
+	var material := ShaderMaterial.new()
+	material.shader = CAUSTIC_FLOOR_SHADER
+	material.set_shader_parameter("caustic_noise", _make_ripple_noise(0.007))
+
+	var body := StaticBody3D.new()
+	body.name = "FlatFloor"
+	body.position = Vector3(0.0, FLOOR_DEPTH_M, 0.0)
+	body.set_meta("sonar_material", 1)
+	body.set_meta("sonar_reflectivity", 0.6)
+
+	var mesh_instance := MeshInstance3D.new()
+	mesh_instance.name = "Mesh"
+	mesh_instance.mesh = plane
+	mesh_instance.material_override = material
+	body.add_child(mesh_instance)
+
+	var collision := CollisionShape3D.new()
+	collision.name = "Collision"
+	var shape := BoxShape3D.new()
+	shape.size = Vector3(SITE_EXTENT_M, 1.0, SITE_EXTENT_M)
+	collision.shape = shape
+	collision.position = Vector3(0.0, -0.5, 0.0)
+	body.add_child(collision)
+	add_child(body)
+
+
+func _add_surface_occluder() -> void:
+	var plane := PlaneMesh.new()
+	plane.size = Vector2(SITE_EXTENT_M, SITE_EXTENT_M)
+
+	var material := ShaderMaterial.new()
+	material.shader = SURFACE_OCCLUDER_SHADER
+	material.set_shader_parameter("ripple_noise", _make_ripple_noise(0.009))
+	material.set_shader_parameter("drift_speed", SURFACE_DRIFT_SPEED)
+	material.set_shader_parameter("ripple_scale", SURFACE_RIPPLE_SCALE)
+	material.set_shader_parameter("pool_center_xz", SHAFT_POOL_CENTER_XZ_M)
+	material.set_shader_parameter("pool_radius", SHAFT_POOL_RADIUS_M)
+	material.set_shader_parameter("pool_edge", SHAFT_POOL_EDGE_M)
+
+	var occluder := MeshInstance3D.new()
+	occluder.name = "CalmSurfaceOccluder"
+	occluder.position = Vector3(0.0, SURFACE_LEVEL_M, 0.0)
+	occluder.mesh = plane
+	occluder.material_override = material
+	occluder.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_SHADOWS_ONLY
+	add_child(occluder)
+
+
+func _add_surface_ceiling() -> void:
+	var plane := PlaneMesh.new()
+	plane.size = Vector2(SITE_EXTENT_M * 1.5, SITE_EXTENT_M * 1.5)
+
+	var material := ShaderMaterial.new()
+	material.shader = SURFACE_CEILING_SHADER
+	material.set_shader_parameter("ripple_noise", _make_ripple_noise(0.009))
+	material.set_shader_parameter("drift_speed", SURFACE_DRIFT_SPEED)
+	material.set_shader_parameter("pool_center_xz", SHAFT_POOL_CENTER_XZ_M)
+	material.set_shader_parameter("pool_radius", SHAFT_POOL_RADIUS_M)
+	material.set_shader_parameter("lit_scale", SURFACE_CEILING_LIT_SCALE)
+
+	var ceiling := MeshInstance3D.new()
+	ceiling.name = "SurfaceCeiling"
+	ceiling.position = Vector3(0.0, SURFACE_LEVEL_M, 0.0)
+	ceiling.mesh = plane
+	ceiling.material_override = material
+	ceiling.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
+	add_child(ceiling)
+
+
+func _add_air_fog_cut() -> void:
+	var air := FogVolume.new()
+	air.name = "AirFogCut"
+	air.shape = RenderingServer.FOG_VOLUME_SHAPE_BOX
+	air.size = Vector3(SITE_EXTENT_M * 1.5, AIR_VOLUME_HEIGHT_M, SITE_EXTENT_M * 1.5)
+	air.position = Vector3(0.0, SURFACE_LEVEL_M + AIR_VOLUME_HEIGHT_M * 0.5, 0.0)
+	var material := FogMaterial.new()
+	material.density = -VOLUMETRIC_FOG_DENSITY
+	material.edge_fade = 0.0
+	air.material = material
+	add_child(air)
+
+
+func _make_ripple_noise(frequency: float) -> NoiseTexture2D:
+	var noise := FastNoiseLite.new()
+	noise.seed = NOISE_SEED
+	noise.noise_type = FastNoiseLite.TYPE_SIMPLEX_SMOOTH
+	noise.frequency = frequency
+	noise.fractal_octaves = 3
+	noise.fractal_lacunarity = 2.1
+	noise.fractal_gain = 0.45
+
+	var texture := NoiseTexture2D.new()
+	texture.width = 512
+	texture.height = 512
+	texture.seamless = true
+	texture.generate_mipmaps = true
+	texture.noise = noise
+	return texture

game/world/sites/sunlit_shallows_environment.tscn

@@ -0,0 +1,64 @@
+[gd_scene load_steps=3 format=3]
+
+[ext_resource type="Script" path="res://game/world/sites/sunlit_shallows_environment.gd" id="1_environment"]
+
+[sub_resource type="Environment" id="EnvironmentSunlitShallows"]
+background_mode = 1
+background_color = Color(0.005, 0.03, 0.06, 1)
+ambient_light_source = 3
+ambient_light_color = Color(0.14, 0.32, 0.42, 1)
+ambient_light_energy = 0.22
+tonemap_mode = 2
+tonemap_exposure = 0.75
+glow_enabled = true
+glow_levels/1 = 0.6
+glow_levels/2 = 1.0
+glow_levels/3 = 0.8
+glow_levels/4 = 0.3
+glow_intensity = 0.35
+glow_blend_mode = 0
+glow_hdr_threshold = 1.6
+fog_enabled = true
+fog_light_color = Color(0.04, 0.16, 0.24, 1)
+fog_light_energy = 0.12
+fog_sun_scatter = 0.0
+fog_density = 0.003
+fog_aerial_perspective = 0.6
+fog_sky_affect = 1.0
+volumetric_fog_enabled = true
+volumetric_fog_density = 0.035
+volumetric_fog_albedo = Color(0.26, 0.52, 0.7, 1)
+volumetric_fog_emission_energy = 0.0
+volumetric_fog_anisotropy = 0.55
+volumetric_fog_length = 150.0
+volumetric_fog_detail_spread = 1.6
+volumetric_fog_ambient_inject = 0.015
+volumetric_fog_sky_affect = 1.0
+volumetric_fog_temporal_reprojection_enabled = true
+volumetric_fog_temporal_reprojection_amount = 0.92
+
+[node name="SunlitShallowsEnvironment" type="Node3D"]
+script = ExtResource("1_environment")
+
+[node name="WorldEnvironment" type="WorldEnvironment" parent="."]
+environment = SubResource("EnvironmentSunlitShallows")
+
+[node name="Sun" type="DirectionalLight3D" parent="."]
+rotation_degrees = Vector3(-44, 162, 0)
+light_color = Color(0.86, 0.95, 1, 1)
+light_energy = 1.0
+light_volumetric_fog_energy = 1.4
+shadow_enabled = true
+shadow_bias = 0.04
+shadow_normal_bias = 1.5
+shadow_blur = 2.5
+directional_shadow_mode = 1
+directional_shadow_split_1 = 0.2
+directional_shadow_blend_splits = true
+directional_shadow_max_distance = 160.0
+
+[node name="ObserverCamera" type="Camera3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, 0.9962, 0.0872, 0, -0.0872, 0.9962, 0, -30, 0)
+fov = 72.0
+near = 0.1
+far = 400.0

game/world/sites/sunlit_shallows_surface_ceiling.gdshader

@@ -0,0 +1,32 @@
+// Underside of the calm surface as seen from below: dark everywhere, lit with
+// drifting crests only inside the pool where the occluder lets the sun through.
+// Purely visual; shadows and shafts come from the occluder mesh.
+shader_type spatial;
+render_mode unshaded, cull_disabled;
+
+uniform sampler2D ripple_noise : repeat_enable, filter_linear_mipmap;
+uniform vec2 pool_center_xz = vec2(-14.0, -31.0);
+uniform float pool_radius = 22.0;
+uniform float ripple_scale = 0.03;
+uniform float drift_speed = 0.012;
+uniform float lit_scale : hint_range(0.0, 1.0) = 0.3;
+uniform vec3 dark_color : source_color = vec3(0.01, 0.05, 0.09);
+uniform vec3 lit_color : source_color = vec3(0.5, 0.85, 1.0);
+
+varying vec2 world_xz;
+
+void vertex() {
+	world_xz = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xz;
+}
+
+void fragment() {
+	vec2 slow_drift = vec2(TIME * drift_speed);
+	vec2 cross_drift = vec2(-TIME * drift_speed * 0.7);
+	float broad = texture(ripple_noise, world_xz * ripple_scale + slow_drift).r;
+	float fine = texture(ripple_noise, world_xz * ripple_scale * 1.9 + cross_drift).r;
+	float crest = smoothstep(0.45, 0.7, broad * 0.65 + fine * 0.35);
+	float pool = 1.0 - smoothstep(
+		pool_radius * 0.6, pool_radius * 1.6, distance(world_xz, pool_center_xz)
+	);
+	ALBEDO = mix(dark_color, lit_color * (0.35 + crest) * lit_scale, pool);
+}

game/world/sites/sunlit_shallows_surface_occluder.gdshader

@@ -0,0 +1,39 @@
+// Calm-water surface seen only through its shadow: the mesh is invisible
+// (SHADOW_ONLY) and the alpha-scissor cut-outs let the fixed daytime sun carve
+// light shafts into the volumetric fog below.
+shader_type spatial;
+render_mode cull_disabled, unshaded, depth_prepass_alpha;
+
+uniform sampler2D ripple_noise : repeat_enable, filter_linear_mipmap;
+uniform float ripple_scale = 0.025;
+uniform float drift_speed = 0.012;
+uniform float coverage : hint_range(0.0, 1.0) = 0.30;
+// World-space pool where the surface lets sunlight through. Outside it the
+// surface is fully opaque, so shafts only form in that patch of water.
+uniform vec2 pool_center_xz = vec2(-14.0, -31.0);
+uniform float pool_radius = 22.0;
+uniform float pool_edge = 12.0;
+
+varying vec2 world_xz;
+
+void vertex() {
+	world_xz = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xz;
+}
+
+void fragment() {
+	vec2 slow_drift = TIME * drift_speed * vec2(1.0, 0.35);
+	vec2 cross_drift = TIME * drift_speed * vec2(-0.4, 0.9);
+	float broad = texture(ripple_noise, world_xz * ripple_scale + slow_drift).r;
+	float fine = texture(ripple_noise, world_xz * ripple_scale * 1.9 + cross_drift).r;
+	float raw_ripple = broad * 0.65 + fine * 0.35;
+	// Inside the pool the crests are sharpened so the gaps cut crisp shafts.
+	float pool_ripple = smoothstep(0.35, 0.65, raw_ripple);
+	// Outside the pool only the deepest troughs open: a dim dapple, not darkness.
+	float dim_ripple = smoothstep(0.16, 0.30, raw_ripple);
+	float pool = 1.0 - smoothstep(
+		pool_radius - pool_edge, pool_radius, distance(world_xz, pool_center_xz)
+	);
+	ALBEDO = vec3(0.0);
+	ALPHA = mix(dim_ripple, pool_ripple, pool);
+	ALPHA_SCISSOR_THRESHOLD = coverage;
+}

project.godot

@@ -23,4 +23,6 @@ window/stretch/mode="canvas_items"
 
 [rendering]
 
+environment/volumetric_fog/volume_size=128
+environment/volumetric_fog/volume_depth=128
 textures/default_filters/use_nearest_mipmap_filter=false

scripts/check_architecture.sh

@@ -108,7 +108,7 @@ if [ -d game ]; then
 
 	input_violations="$(
 		rg -n '\bInput\.' game --glob '*.gd' \
-		| rg -v '^game/infrastructure/input/' \
+		| rg -v '^game[/\\]infrastructure[/\\]input[/\\]' \
 		|| true
 	)"
 	fail_with_matches "direct Input access outside infrastructure/input" "$input_violations"

scripts/quality_gate.sh

@@ -113,6 +113,16 @@ check_godot_log \
 	"production foundation integration" \
 	"$QUALITY_TEMP_DIRECTORY/foundation-integration-console.log"
 
+printf 'Quality gate: sunlit shallows environment integration\n'
+"$GODOT_EXECUTABLE" --headless \
+	--log-file "$QUALITY_TEMP_DIRECTORY/sunlit-shallows-integration.log" \
+	--path . \
+	--script tests/integration/run_sunlit_shallows_environment.gd \
+	2>&1 | tee "$QUALITY_TEMP_DIRECTORY/sunlit-shallows-integration-console.log"
+check_godot_log \
+	"sunlit shallows environment integration" \
+	"$QUALITY_TEMP_DIRECTORY/sunlit-shallows-integration-console.log"
+
 printf 'Quality gate: POC B integration\n'
 "$GODOT_EXECUTABLE" --headless \
 	--log-file "$QUALITY_TEMP_DIRECTORY/poc_b_integration.log" \

tests/integration/run_sunlit_shallows_environment.gd

@@ -0,0 +1,248 @@
+extends SceneTree
+
+## Checks the sunlit shallows visual site keeps its three promises:
+## a flat floor, a calm shadow-only water surface, and a daytime sun whose
+## hour never changes.
+
+const SCENE_PATH := "res://game/world/sites/sunlit_shallows_environment.tscn"
+const WORLD_SCENE_PATH := (
+	"res://game/composition/vertical_slice/sunlit_shallows_world.tscn"
+)
+
+var _failures: Array[String] = []
+var _checks := 0
+
+
+func _init() -> void:
+	_run.call_deferred()
+
+
+func _run() -> void:
+	var scene := load(SCENE_PATH) as PackedScene
+	_expect(scene != null, "scene loads")
+	if scene == null:
+		_finish()
+		return
+
+	var site := scene.instantiate() as SunlitShallowsEnvironment
+	_expect(site != null, "scene root is SunlitShallowsEnvironment")
+	if site == null:
+		_finish()
+		return
+	root.add_child(site)
+	await process_frame
+
+	_test_fixed_daytime_sun(site)
+	_test_flat_floor(site)
+	_test_calm_surface_occluder(site)
+	_test_scattering_environment(site)
+	_test_air_fog_cut(site)
+	_test_surface_ceiling(site)
+
+	site.queue_free()
+	await process_frame
+	_test_composed_world()
+	_finish()
+
+
+func _test_composed_world() -> void:
+	var world_scene := load(WORLD_SCENE_PATH) as PackedScene
+	_expect(world_scene != null, "composed world scene loads")
+	if world_scene == null:
+		return
+	var world := world_scene.instantiate() as Node3D
+	_expect(
+		world.get_node_or_null("Environment") is SunlitShallowsEnvironment,
+		"composed world uses the sunlit shallows environment"
+	)
+	var submarine := world.get_node_or_null("SubmarineActor") as Node3D
+	_expect(submarine != null, "composed world has a submarine")
+	if submarine != null:
+		_expect(
+			submarine.position.y < SunlitShallowsEnvironment.SURFACE_LEVEL_M
+			and submarine.position.y > SunlitShallowsEnvironment.FLOOR_DEPTH_M,
+			"submarine starts between surface and floor"
+		)
+		_expect(
+			submarine.get_node_or_null("CockpitInterior") != null
+			and submarine.get_node_or_null("CockpitCameraRig") != null,
+			"submarine carries cockpit and camera rig"
+		)
+		for projector_name: String in ["LeftProjector", "RightProjector"]:
+			var projector := submarine.get_node_or_null(projector_name) as SpotLight3D
+			_expect(projector != null, "%s exists" % projector_name)
+			if projector != null:
+				_expect(
+					projector.light_volumetric_fog_energy < 1.0,
+					"%s does not wash out the sun shafts in the fog" % projector_name
+				)
+	world.free()
+
+
+func _test_fixed_daytime_sun(site: SunlitShallowsEnvironment) -> void:
+	var sun := site.get_node_or_null("Sun") as DirectionalLight3D
+	_expect(sun != null, "sun is a DirectionalLight3D")
+	if sun == null:
+		return
+	_expect(
+		sun.rotation_degrees.is_equal_approx(
+			SunlitShallowsEnvironment.SUN_ROTATION_DEGREES
+		),
+		"sun hour is the fixed constant"
+	)
+	var sun_direction := -sun.global_transform.basis.z
+	_expect(sun_direction.y < -0.6, "sun shines downward from above the porthole (daytime)")
+	_expect(
+		sun_direction.z > 0.15,
+		"sun shines toward the observer (rays come from ahead, world -Z)"
+	)
+	_expect(sun.shadow_enabled, "sun casts shadows (needed for light shafts)")
+	_expect(
+		sun.light_volumetric_fog_energy >= 1.0,
+		"sun injects energy into the volumetric fog"
+	)
+
+
+func _test_flat_floor(site: SunlitShallowsEnvironment) -> void:
+	var floor_mesh := site.get_node_or_null("FlatFloor/Mesh") as MeshInstance3D
+	_expect(floor_mesh != null, "floor mesh exists")
+	if floor_mesh == null:
+		return
+	var vertices := floor_mesh.mesh.get_faces()
+	var flat := true
+	for vertex: Vector3 in vertices:
+		if not is_zero_approx(vertex.y):
+			flat = false
+			break
+	_expect(flat, "floor mesh is flat")
+	_expect(
+		is_equal_approx(
+			floor_mesh.global_position.y,
+			SunlitShallowsEnvironment.FLOOR_DEPTH_M
+		),
+		"floor sits at the site depth"
+	)
+	_expect(
+		floor_mesh.material_override is ShaderMaterial,
+		"floor uses the caustic shader material"
+	)
+	var collision := site.get_node_or_null("FlatFloor/Collision") as CollisionShape3D
+	_expect(collision != null and collision.shape is BoxShape3D, "floor has a box collider")
+
+
+func _test_calm_surface_occluder(site: SunlitShallowsEnvironment) -> void:
+	var occluder := site.get_node_or_null("CalmSurfaceOccluder") as MeshInstance3D
+	_expect(occluder != null, "surface occluder exists")
+	if occluder == null:
+		return
+	_expect(
+		occluder.cast_shadow == GeometryInstance3D.SHADOW_CASTING_SETTING_SHADOWS_ONLY,
+		"surface occluder is shadow-only"
+	)
+	_expect(
+		is_equal_approx(
+			occluder.global_position.y,
+			SunlitShallowsEnvironment.SURFACE_LEVEL_M
+		),
+		"surface occluder sits at water level"
+	)
+	var material := occluder.material_override as ShaderMaterial
+	_expect(material != null, "surface occluder uses a shader material")
+	if material == null:
+		return
+	var drift: Variant = material.get_shader_parameter("drift_speed")
+	_expect(
+		drift is float and drift > 0.0 and drift < 0.05,
+		"surface drift is slow (calm water)"
+	)
+	_expect(
+		material.get_shader_parameter("ripple_noise") is NoiseTexture2D,
+		"surface ripple noise is assigned"
+	)
+	var pool_center: Variant = material.get_shader_parameter("pool_center_xz")
+	_expect(
+		pool_center is Vector2 and pool_center.y < -20.0 and pool_center.y > -120.0,
+		"light pool sits a few tens of metres ahead (world -Z)"
+	)
+	var pool_radius: Variant = material.get_shader_parameter("pool_radius")
+	_expect(
+		pool_radius is float and pool_radius > 5.0 and pool_radius < 60.0,
+		"light pool radius is local, not the whole surface"
+	)
+
+
+func _test_scattering_environment(site: SunlitShallowsEnvironment) -> void:
+	var world_environment := site.get_node_or_null("WorldEnvironment") as WorldEnvironment
+	_expect(world_environment != null, "world environment exists")
+	if world_environment == null:
+		return
+	var environment := world_environment.environment
+	_expect(environment.volumetric_fog_enabled, "volumetric fog is enabled")
+	_expect(environment.volumetric_fog_anisotropy > 0.5, "fog scatters forward")
+	_expect(environment.fog_enabled, "depth fog is enabled")
+
+
+func _test_surface_ceiling(site: SunlitShallowsEnvironment) -> void:
+	var ceiling := site.get_node_or_null("SurfaceCeiling") as MeshInstance3D
+	_expect(ceiling != null, "visible surface ceiling exists")
+	if ceiling == null:
+		return
+	_expect(
+		is_equal_approx(ceiling.global_position.y, SunlitShallowsEnvironment.SURFACE_LEVEL_M),
+		"surface ceiling sits at water level"
+	)
+	_expect(
+		ceiling.cast_shadow == GeometryInstance3D.SHADOW_CASTING_SETTING_OFF,
+		"surface ceiling leaves shadowing to the occluder"
+	)
+	var ceiling_material := ceiling.material_override as ShaderMaterial
+	var occluder := site.get_node_or_null("CalmSurfaceOccluder") as MeshInstance3D
+	var occluder_material: ShaderMaterial = null if occluder == null else occluder.material_override
+	_expect(
+		ceiling_material != null
+		and occluder_material != null
+		and ceiling_material.get_shader_parameter("pool_center_xz")
+			== occluder_material.get_shader_parameter("pool_center_xz")
+		and ceiling_material.get_shader_parameter("pool_radius")
+			== occluder_material.get_shader_parameter("pool_radius"),
+		"surface ceiling lights the same pool the occluder opens"
+	)
+
+
+func _test_air_fog_cut(site: SunlitShallowsEnvironment) -> void:
+	var air := site.get_node_or_null("AirFogCut") as FogVolume
+	_expect(air != null, "air fog cut exists")
+	if air == null:
+		return
+	var bottom := air.global_position.y - air.size.y * 0.5
+	_expect(
+		is_equal_approx(bottom, SunlitShallowsEnvironment.SURFACE_LEVEL_M),
+		"air fog cut starts at the water surface"
+	)
+	var material := air.material as FogMaterial
+	_expect(material != null and material.density < 0.0, "air fog cut subtracts fog")
+	var world_environment := site.get_node("WorldEnvironment") as WorldEnvironment
+	_expect(
+		material != null and is_equal_approx(
+			-material.density,
+			world_environment.environment.volumetric_fog_density
+		),
+		"air fog cut cancels the global volumetric density exactly"
+	)
+
+
+func _expect(condition: bool, label: String) -> void:
+	_checks += 1
+	if not condition:
+		_failures.append(label)
+
+
+func _finish() -> void:
+	if _failures.is_empty():
+		print("Sunlit shallows environment: %d passed, 0 failed." % _checks)
+		quit(0)
+	else:
+		for failure: String in _failures:
+			push_error("sunlit shallows environment: %s" % failure)
+		print("Sunlit shallows environment: %d failed." % _failures.size())
+		quit(1)

tests/integration/run_vertical_slice_foundation.gd

@@ -30,7 +30,7 @@ const ProductionInputAdapter = preload(
 	"res://game/infrastructure/input/production_input_adapter.gd"
 )
 
-const TEST_COUNT := 91
+const TEST_COUNT := 94
 
 var _failures: Array[String] = []
 
@@ -186,6 +186,9 @@ func _test_vehicle_slice(composition: VerticalSliceRoot) -> void:
 	_expect(detailing.practical_light_count() == 2, "cockpit uses two caged practical lights")
 	_expect(pressure_bulkhead.panel_count() == 1, "porthole bulkhead uses one continuous curved shell")
 	_expect(pressure_bulkhead.rectangular_whitebox_is_hidden(), "porthole rectangular whitebox is hidden")
+	_expect(pressure_bulkhead.glass_is_on_dedicated_layer(), "porthole glass sits alone on its render layer")
+	_expect(pressure_bulkhead.glass_roughness() >= 0.4, "porthole glass is rough enough to smear lamp reflections")
+	_expect(detailing.fill_light_ignores_porthole_glass(), "porthole fill light does not reflect in the glass")
 	_expect(analog_gauges.gauge_count() == 4, "dashboard exposes four primary analog instruments")
 	_expect(alert_box.indicator_count() == 3, "alert box exposes three pilot lights")
 	_expect(alert_box.active_indicator_count() == 1, "exactly one pilot light reflects the alert state")