feat: derive resource visuals from state

docs/BUILD_IN_PUBLIC_PLAN.md

@@ -787,16 +787,19 @@ Completed:
     separate terrain-snapped approach points. Matched captures and a focused
     scenario prove three-batch visual cost, nested discovery, and a forced
     query beyond the first 24 m range without changing the 18-resource state.
+38. `Jajce Resource States 05`: a shared amount-derived presentation contract
+    now gives that berry and tree honest full, low, and depleted states. Real
+    player berry harvests thin fruit and leaves; real NPC wood gathers thin the
+    crown and leave a stump. Low and depleted saves restore the same visuals
+    using only `amount_remaining`, with matched Metal comparison frames.
 
 Next:
 
-1. Give the authored berry/tree resources state-driven low/depleted visuals
+1. Move the existing `tree_forest_grove_01` and `tree_forest_grove_02` anchors
-   sourced from their real `ResourceStateRecord` amount. Prove NPC and player
+   into one bounded forest-edge authoring cluster. Reuse the proven tree amount
-   extraction plus save/restore rebuild the same presentation without adding
+   presentation, preserve both stable IDs, and prove reachable expanding
-   visual fields to simulation state.
+   discovery plus depletion/restore without serializing decorative foliage.
-2. Apply the workflow to a second forest-edge consumer only after that contract
+2. Add livestock only with a real identity and interaction contract.
-   is honest and reusable. Add livestock only with a real identity and
-   interaction contract.
 
 Do not start with GIS data, a full city, a large asset pack, or more NPC
 mechanics. The next proof is a beautiful stage for the systems that already

docs/LEARNING_ROADMAP.md

@@ -904,17 +904,29 @@ of eighteen resources, sit above the carved channel, and expose separate
 terrain-snapped approach points. A forced village query expands beyond the
 initial 24 m range and selects the nested berry exactly by ID.
 
-The immediate next slice should make those two resource-specific visuals
+The first amount-derived resource presentation slice is complete. A shared
-reflect authoritative amount/depletion: thin the berry patch and leave a stump
+`ResourceAmountVisual` contract reads the loaded `ResourceNode`'s authoritative
-or equivalent readable tree state after real NPC/player extraction, then prove
+amount and derives full, low, or depleted presentation without entering saved
-save/restore rebuilds the same presentation without persisting visual-only
+state. Real player berry harvests remove fruit and leaf mass; real NPC wood
-state. Only after both the berry and tree consume that contract should shared
+gathers thin the crown and ultimately leave a warm-cut stump. Restoring both
-cluster/depletion tooling be extracted or the workflow copied to a forest
+low and depleted snapshots rebinds the same nodes and reconstructs the same
-edge. Do not generalize the resource grid to people/buildings/events or
+visuals from `ResourceStateRecord.amount_remaining` alone.
-introduce active/abstract LOD before those consumers need it.
+
+The immediate next slice should apply that proven contract to the existing
+`tree_forest_grove_01` and `tree_forest_grove_02` anchors as one bounded
+forest-edge authoring consumer. Preserve both stable IDs, keep decorative
+canopy/understory outside simulation state, and prove reachable expanding
+discovery plus depletion/restore with the shared tree presentation. Do not
+generalize the resource grid to people/buildings/events or introduce
+active/abstract LOD before those consumers need it.
 
 Recently completed:
 
+- `Jajce Resource States 05`: the authored river berry/tree now derive full,
+  low, and depleted visuals from authoritative amounts. Player and NPC
+  extraction drive the changes, save/restore reconstructs low and depleted
+  states without visual save fields, and matched Metal frames record the berry
+  thinning, sparse crown, fruitless remnant, and stump.
 - `Jajce Resource Grove 04`: two existing river resources now live as nested
   stable-ID anchors inside a restrained decorative bank cluster. Twenty-eight
   understory instances use three MultiMesh batches, bespoke berry/tree visuals

docs/baselines/JAJCE_RESOURCE_STATES_05.md

@@ -0,0 +1,80 @@
+# Jajce Resource States 05
+
+Captured: 2026-07-17
+
+## Files
+
+- [full resources](jajce_resource_states_05_full.png)
+- [low resources](jajce_resource_states_05_low.png)
+- [depleted resources](jajce_resource_states_05_depleted.png)
+- `world/resource_nodes/ResourceAmountVisual.gd`
+- `world/jajce/HarvestableTreePresentation.tscn`
+- `tests/jajce_resource_presentation_state_test.gd`
+
+The three images use the same 1280×720 cross-river camera, daylight value,
+warmup, and Metal renderer. Debug labels are hidden. The lower-left berry patch
+and right-hand harvestable tree are shown at their authored full amounts, at
+40%/50% respectively, and at zero.
+
+## Amount-derived visual language
+
+`ResourceAmountVisual` finds its owning `ResourceNode` and derives one of three
+tiers from `amount_remaining / initial_amount`:
+
+- full keeps all five berry leaf clumps, eight berries, and four tree canopies;
+- low keeps three leaf clumps, four berries, and two tree canopies; and
+- depleted keeps a two-leaf fruitless remnant and replaces the tree with a
+  low-poly stump and warm cut face.
+
+The threshold is deliberately simple and readable: a positive source at or
+below half amount is low. The berry keeps using two bounded MultiMeshes, so
+thinning changes only `visible_instance_count`; it does not create or destroy
+nodes during play. The tree wrapper reuses the existing wind-reactive standing
+tree and toggles authored crown/stump parts.
+
+## Authority and restore proof
+
+`ResourceStateRecord` remains the only amount authority. `ResourceNode` now
+emits its existing `amount_changed` presentation signal when authoritative
+state is rebound, including restore. The visual contract listens to that signal
+and also refreshes once after scene readiness, covering either bind order.
+
+The focused scenario performs two real player harvests on
+`berry_bush_river_02` and two real NPC gather completions on
+`tree_river_resource_01`, checks the low presentation and NPC wood inventory,
+then fully depletes both through those same production paths. It restores low
+and depleted snapshots in turn and verifies the presentation is reconstructed.
+The resource records contain no visual, visibility, tier, or stump fields.
+
+The capture tool's optional amount overrides also construct and bind ordinary
+`ResourceStateRecord`s. They do not directly manipulate visual children, so
+the review images exercise the same runtime contract as gameplay.
+
+## Next slice
+
+Apply this contract to the existing `tree_forest_grove_01` and
+`tree_forest_grove_02` stable IDs in one bounded forest-edge cluster. Decorative
+canopy and understory should stay presentation-only while the two finite trees
+remain reachable, discoverable, depletable, and restore correctly.
+
+## Capture commands
+
+```bash
+HOME="$PWD/logs/quality/godot_profile" \
+APPDATA="$PWD/logs/quality/godot_profile" \
+LOCALAPPDATA="$PWD/logs/quality/godot_profile" \
+/Applications/Godot.app/Contents/MacOS/Godot \
+  --path "$PWD" --script res://tools/capture_jajce_lookdev.gd -- \
+  --scene=res://world/jajce/JajceResourceStateLookdev.tscn \
+  --output=res://docs/baselines/jajce_resource_states_05_full.png \
+  --hide-resource-labels
+```
+
+For the low frame, append:
+
+```text
+--resource-amount=berry_bush_river_02:2
+--resource-amount=tree_river_resource_01:4
+```
+
+For the depleted frame, use the same arguments with both amounts set to `0`.

docs/baselines/jajce_resource_states_05_depleted.png.import

@@ -0,0 +1,40 @@
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docs/baselines/jajce_resource_states_05_full.png.import

@@ -0,0 +1,40 @@
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docs/baselines/jajce_resource_states_05_low.png.import

@@ -0,0 +1,40 @@
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+process/size_limit=0
+detect_3d/compress_to=1

tests/jajce_resource_presentation_state_test.gd

@@ -0,0 +1,211 @@
+extends SceneTree
+
+const BERRY_ID := &"berry_bush_river_02"
+const TREE_ID := &"tree_river_resource_01"
+const CLUSTER_PATH := "JajceWorld/WorldObjects/ResourceClusters/RiverbankResourceCluster"
+
+var failures: Array[String] = []
+
+
+func _initialize() -> void:
+	call_deferred("_run")
+
+
+func _run() -> void:
+	var main_scene: Node = load("res://main.tscn").instantiate()
+	root.add_child(main_scene)
+	await process_frame
+	for _frame in 3:
+		await physics_frame
+
+	var manager = main_scene.get_node("SimulationManager")
+	manager.set_process(false)
+	var cluster := main_scene.get_node(CLUSTER_PATH) as RiverbankResourceCluster
+	var berry := cluster.get_node("ResourceAnchors/BerryBush_River_02") as ResourceNode
+	var tree := cluster.get_node("ResourceAnchors/Tree_River_Resource_01") as ResourceNode
+	var berry_visual := berry.get_node("Visual/BerryPatchPresentation") as StylizedBerryPatch
+	var tree_visual := tree.get_node("Visual/TreePresentation") as HarvestableTreePresentation
+
+	_check_initial_presentation(berry_visual, tree_visual)
+
+	var berry_state: ResourceStateRecord = manager.get_resource_state(BERRY_ID)
+	var tree_state: ResourceStateRecord = manager.get_resource_state(TREE_ID)
+	_check(berry_state != null and tree_state != null, "Authored resources should bind state")
+	if berry_state == null or tree_state == null:
+		_finish()
+		return
+
+	for _action in 2:
+		_check(
+			is_equal_approx(manager.harvest_resource_node(berry), berry.yield_per_action),
+			"Player harvesting should extract the configured berry yield"
+		)
+	var npc: SimNPC = manager.npcs[0]
+	for _action in 2:
+		_complete_npc_gather(manager, npc, tree)
+
+	_check(
+		is_equal_approx(berry_state.get_amount_remaining(), 2.0),
+		"Two player harvests should leave the authored berry at 40 percent"
+	)
+	_check(
+		berry_visual.get_amount_tier() == ResourceAmountVisual.AmountTier.LOW,
+		"The berry should derive its low tier from authoritative amount"
+	)
+	_check(
+		berry_visual.get_visible_leaf_count() == 3 and berry_visual.get_visible_berry_count() == 4,
+		"The low berry should visibly thin to three leaves and four berries"
+	)
+	_check(
+		is_equal_approx(tree_state.get_amount_remaining(), 4.0),
+		"Two NPC completions should leave the authored tree at half amount"
+	)
+	_check(
+		tree_visual.get_amount_tier() == ResourceAmountVisual.AmountTier.LOW,
+		"The tree should derive its low tier from authoritative amount"
+	)
+	_check(
+		(
+			tree_visual.is_standing_visible()
+			and not tree_visual.is_stump_visible()
+			and tree_visual.get_visible_canopy_count() == 2
+		),
+		"The low tree should remain standing with a visibly thinned crown"
+	)
+	_check(
+		is_equal_approx(npc.get_inventory_amount(SimulationIds.RESOURCE_WOOD), 4.0),
+		"The low tree state should come from real NPC inventory-producing extraction"
+	)
+
+	var low_snapshot: String = manager.serialize_state()
+	_check_no_visual_state(low_snapshot)
+
+	while berry_state.can_extract():
+		manager.harvest_resource_node(berry)
+	while tree_state.can_extract():
+		_complete_npc_gather(manager, npc, tree)
+
+	_check_depleted_presentation(berry_visual, tree_visual)
+	var depleted_snapshot: String = manager.serialize_state()
+	_check_no_visual_state(depleted_snapshot)
+
+	_check(
+		manager.restore_state_from_json(low_snapshot),
+		"Low authoritative resource state should restore"
+	)
+	berry_state = manager.get_resource_state(BERRY_ID)
+	tree_state = manager.get_resource_state(TREE_ID)
+	_check(
+		(
+			is_equal_approx(berry_state.get_amount_remaining(), 2.0)
+			and berry_visual.get_visible_berry_count() == 4
+			and berry_visual.get_amount_tier() == ResourceAmountVisual.AmountTier.LOW
+		),
+		"Restore should rebuild the low berry visual from amount alone"
+	)
+	_check(
+		(
+			is_equal_approx(tree_state.get_amount_remaining(), 4.0)
+			and tree_visual.get_visible_canopy_count() == 2
+			and not tree_visual.is_stump_visible()
+		),
+		"Restore should rebuild the low standing tree from amount alone"
+	)
+
+	_check(
+		manager.restore_state_from_json(depleted_snapshot),
+		"Depleted authoritative resource state should restore"
+	)
+	_check_depleted_presentation(berry_visual, tree_visual)
+	_finish()
+
+
+func _check_initial_presentation(
+	berry_visual: StylizedBerryPatch, tree_visual: HarvestableTreePresentation
+) -> void:
+	_check(
+		(
+			berry_visual.get_amount_tier() == ResourceAmountVisual.AmountTier.FULL
+			and berry_visual.get_visible_leaf_count() == 5
+			and berry_visual.get_visible_berry_count() == 8
+		),
+		"A full berry source should show all authored leaves and fruit"
+	)
+	_check(
+		(
+			tree_visual.get_amount_tier() == ResourceAmountVisual.AmountTier.FULL
+			and tree_visual.is_standing_visible()
+			and not tree_visual.is_stump_visible()
+			and tree_visual.get_visible_canopy_count() == 4
+		),
+		"A full tree source should show its complete standing crown"
+	)
+
+
+func _complete_npc_gather(manager, npc: SimNPC, resource: ResourceNode) -> void:
+	npc.target_id = resource.node_id
+	var reserved: bool = manager.reserve_resource(resource.node_id, npc.id)
+	_check(reserved, "NPC extraction should reserve the authored tree")
+	if reserved:
+		manager.call("_complete_resource_gather", npc, SimulationIds.ACTION_GATHER_WOOD)
+
+
+func _check_depleted_presentation(
+	berry_visual: StylizedBerryPatch, tree_visual: HarvestableTreePresentation
+) -> void:
+	_check(
+		(
+			berry_visual.get_amount_tier() == ResourceAmountVisual.AmountTier.DEPLETED
+			and berry_visual.get_visible_leaf_count() == 2
+			and berry_visual.get_visible_berry_count() == 0
+		),
+		"Real player depletion should leave a small fruitless berry remnant"
+	)
+	_check(
+		(
+			tree_visual.get_amount_tier() == ResourceAmountVisual.AmountTier.DEPLETED
+			and not tree_visual.is_standing_visible()
+			and tree_visual.is_stump_visible()
+			and tree_visual.get_visible_canopy_count() == 0
+		),
+		"Real NPC depletion should replace the standing tree with its stump"
+	)
+
+
+func _check_no_visual_state(snapshot: String) -> void:
+	var parsed = JSON.parse_string(snapshot)
+	_check(parsed is Dictionary, "Serialized simulation state should remain valid JSON")
+	if not parsed is Dictionary:
+		return
+	var matched_records := 0
+	for resource_data in parsed.get("resources", []):
+		if StringName(resource_data.get("node_id", "")) not in [BERRY_ID, TREE_ID]:
+			continue
+		matched_records += 1
+		for field in resource_data.keys():
+			var field_name := String(field)
+			_check(
+				(
+					not field_name.contains("visual")
+					and not field_name.contains("visible")
+					and not field_name.contains("tier")
+					and not field_name.contains("stump")
+				),
+				"Resource save fields should contain authority, never visual state"
+			)
+	_check(matched_records == 2, "Both authored resources should remain in simulation saves")
+
+
+func _check(condition: bool, message: String) -> void:
+	if not condition:
+		failures.append(message)
+
+
+func _finish() -> void:
+	if failures.is_empty():
+		print("[TEST] Jajce resource presentation passed: amount -> low/depleted -> restore")
+		quit(0)
+		return
+	for failure in failures:
+		push_error("[TEST] " + failure)
+	quit(1)

tests/jajce_resource_presentation_state_test.gd.uid

@@ -0,0 +1 @@
+uid://c7yc6j4js8phj

tools/capture_jajce_lookdev.gd

@@ -23,6 +23,9 @@ func _run() -> void:
 	var lookdev := scene.instantiate() as Node3D
 	root.add_child(lookdev)
 	await process_frame
+	if not _apply_resource_capture_overrides():
+		quit(1)
+		return
 	_stabilize_lookdev(lookdev)
 	for _frame in WARMUP_FRAMES:
 		await process_frame
@@ -73,6 +76,32 @@ func _get_argument_value(prefix: String, default_value: String) -> String:
 	return default_value
 
 
+func _apply_resource_capture_overrides() -> bool:
+	var hide_labels := OS.get_cmdline_user_args().has("--hide-resource-labels")
+	for resource in ResourceNode.get_all():
+		if hide_labels:
+			resource.set_debug_label_enabled(false)
+
+	for argument in OS.get_cmdline_user_args():
+		if not argument.begins_with("--resource-amount="):
+			continue
+		var override_text := argument.trim_prefix("--resource-amount=")
+		var parts := override_text.split(":", false, 1)
+		if parts.size() != 2 or not parts[1].is_valid_float():
+			push_error("Invalid resource amount override: %s" % override_text)
+			return false
+		var resource := ResourceNode.get_by_id(StringName(parts[0]))
+		if resource == null:
+			push_error("Unknown resource amount override ID: %s" % parts[0])
+			return false
+		var state := ResourceStateRecord.create_from_node(resource)
+		state.set_amount_remaining(parts[1].to_float())
+		if not resource.bind_state(state):
+			push_error("Could not bind capture state for resource: %s" % parts[0])
+			return false
+	return true
+
+
 func _analyze_image(image: Image) -> Dictionary:
 	var min_luma := INF
 	var max_luma := -INF

world/jajce/HarvestableTreePresentation.gd

@@ -0,0 +1,41 @@
+class_name HarvestableTreePresentation
+extends ResourceAmountVisual
+
+const THINNED_CANOPIES := [&"CanopyLeft", &"CanopyRight"]
+
+@onready var standing_tree: Node3D = $StandingTree
+@onready var stump: Node3D = $Stump
+
+
+func _ready() -> void:
+	super()
+
+
+func is_standing_visible() -> bool:
+	return standing_tree.visible
+
+
+func is_stump_visible() -> bool:
+	return stump.visible
+
+
+func get_visible_canopy_count() -> int:
+	if not standing_tree.visible:
+		return 0
+	var visible_count := 0
+	for child in standing_tree.get_children():
+		if String(child.name).begins_with("Canopy") and child.visible:
+			visible_count += 1
+	return visible_count
+
+
+func _apply_resource_amount_visual(
+	_amount_remaining: float, _remaining_ratio: float, tier: AmountTier
+) -> void:
+	var depleted := tier == AmountTier.DEPLETED
+	standing_tree.visible = not depleted
+	stump.visible = depleted
+	for canopy_name in THINNED_CANOPIES:
+		var canopy := standing_tree.get_node_or_null(NodePath(canopy_name)) as Node3D
+		if canopy != null:
+			canopy.visible = tier == AmountTier.FULL

world/jajce/HarvestableTreePresentation.gd.uid

@@ -0,0 +1 @@
+uid://cpue05wbg6roj

world/jajce/HarvestableTreePresentation.tscn

@@ -0,0 +1,42 @@
+[gd_scene load_steps=7 format=3]
+
+[ext_resource type="Script" path="res://world/jajce/HarvestableTreePresentation.gd" id="1_script"]
+[ext_resource type="PackedScene" path="res://world/jajce/StylizedTree.tscn" id="2_tree"]
+
+[sub_resource type="StandardMaterial3D" id="Material_stump_bark"]
+albedo_color = Color(0.29, 0.17, 0.09, 1)
+roughness = 0.96
+
+[sub_resource type="CylinderMesh" id="Mesh_stump"]
+material = SubResource("Material_stump_bark")
+top_radius = 0.38
+bottom_radius = 0.48
+height = 0.82
+radial_segments = 10
+
+[sub_resource type="StandardMaterial3D" id="Material_stump_cut"]
+albedo_color = Color(0.69, 0.49, 0.27, 1)
+roughness = 0.9
+
+[sub_resource type="CylinderMesh" id="Mesh_stump_cut"]
+material = SubResource("Material_stump_cut")
+top_radius = 0.36
+bottom_radius = 0.37
+height = 0.055
+radial_segments = 10
+
+[node name="HarvestableTreePresentation" type="Node3D"]
+script = ExtResource("1_script")
+
+[node name="StandingTree" parent="." instance=ExtResource("2_tree")]
+
+[node name="Stump" type="Node3D" parent="."]
+visible = false
+
+[node name="Bark" type="MeshInstance3D" parent="Stump"]
+position = Vector3(0, 0.41, 0)
+mesh = SubResource("Mesh_stump")
+
+[node name="CutFace" type="MeshInstance3D" parent="Stump"]
+position = Vector3(0, 0.835, 0)
+mesh = SubResource("Mesh_stump_cut")

world/jajce/JajceResourceStateLookdev.tscn

@@ -0,0 +1,16 @@
+[gd_scene load_steps=3 format=3]
+
+[ext_resource type="PackedScene" path="res://world/jajce/JajceWorld.tscn" id="1_world"]
+[ext_resource type="Script" path="res://world/jajce/beauty_camera.gd" id="2_camera"]
+
+[node name="JajceResourceStateLookdev" type="Node3D"]
+
+[node name="JajceWorld" parent="." instance=ExtResource("1_world")]
+
+[node name="ResourceCamera" type="Camera3D" parent="."]
+position = Vector3(14, 9, 7)
+current = true
+fov = 40.0
+script = ExtResource("2_camera")
+focus_point = Vector3(34, 3.3, 7)
+animate_orbit = false

world/jajce/RiverbankResourceCluster.tscn

@@ -1,10 +1,11 @@
-[gd_scene load_steps=6 format=3]
+[gd_scene load_steps=7 format=3]
 
 [ext_resource type="Script" path="res://world/jajce/RiverbankResourceCluster.gd" id="1_script"]
 [ext_resource type="PackedScene" path="res://world/resource_nodes/ResourceNode.tscn" id="2_resource"]
 [ext_resource type="PackedScene" path="res://world/jajce/StylizedTree.tscn" id="3_tree"]
 [ext_resource type="PackedScene" path="res://world/jajce/StylizedBerryPatch.tscn" id="4_berry"]
 [ext_resource type="PackedScene" path="res://assets/foliage/tree.glb" id="5_conifer"]
+[ext_resource type="PackedScene" path="res://world/jajce/HarvestableTreePresentation.tscn" id="6_harvestable_tree"]
 
 [node name="RiverbankResourceCluster" type="Node3D"]
 script = ExtResource("1_script")
@@ -66,7 +67,7 @@ discovery_priority = 0.1
 [node name="MeshInstance3D" parent="ResourceAnchors/Tree_River_Resource_01/Visual"]
 visible = false
 
-[node name="TreePresentation" parent="ResourceAnchors/Tree_River_Resource_01/Visual" instance=ExtResource("3_tree")]
+[node name="TreePresentation" parent="ResourceAnchors/Tree_River_Resource_01/Visual" instance=ExtResource("6_harvestable_tree")]
 scale = Vector3(1.08, 1.08, 1.08)
 
 [node name="InteractionPoint" parent="ResourceAnchors/Tree_River_Resource_01"]

world/jajce/StylizedBerryPatch.gd

@@ -1,5 +1,5 @@
 class_name StylizedBerryPatch
-extends Node3D
+extends ResourceAmountVisual
 
 const WIND_SHADER := preload("res://world/jajce/materials/wind.gdshader")
 const LEAF_POSITIONS := [
@@ -31,12 +31,37 @@ const BERRY_POSITIONS := [
 func _ready() -> void:
 	_build_leaves()
 	_build_berries()
+	super()
 
 
 func get_presentation_instance_count() -> int:
 	return LEAF_POSITIONS.size() + BERRY_POSITIONS.size()
 
 
+func get_visible_leaf_count() -> int:
+	return $Leaves.multimesh.visible_instance_count
+
+
+func get_visible_berry_count() -> int:
+	return $Berries.multimesh.visible_instance_count
+
+
+func _apply_resource_amount_visual(
+	_amount_remaining: float, remaining_ratio: float, tier: AmountTier
+) -> void:
+	var visible_leaves := LEAF_POSITIONS.size()
+	if tier == AmountTier.LOW:
+		visible_leaves = 3
+	elif tier == AmountTier.DEPLETED:
+		visible_leaves = 2
+	$Leaves.multimesh.visible_instance_count = visible_leaves
+
+	var visible_berries := ceili(remaining_ratio * BERRY_POSITIONS.size())
+	if tier == AmountTier.DEPLETED:
+		visible_berries = 0
+	$Berries.multimesh.visible_instance_count = visible_berries
+
+
 func _build_leaves() -> void:
 	var mesh := SphereMesh.new()
 	mesh.radius = 1.0

world/resource_nodes/ResourceAmountVisual.gd

@@ -0,0 +1,84 @@
+class_name ResourceAmountVisual
+extends Node3D
+
+enum AmountTier {
+	FULL,
+	LOW,
+	DEPLETED,
+}
+
+@export_range(0.0, 1.0, 0.05) var low_amount_ratio := 0.5
+
+var resource_node: ResourceNode
+var amount_ratio := 1.0
+var amount_tier := AmountTier.FULL
+
+
+func _ready() -> void:
+	call_deferred("_bind_resource_node")
+
+
+func _exit_tree() -> void:
+	if (
+		resource_node != null
+		and resource_node.amount_changed.is_connected(_on_resource_amount_changed)
+	):
+		resource_node.amount_changed.disconnect(_on_resource_amount_changed)
+	resource_node = null
+
+
+func refresh_from_resource() -> void:
+	if resource_node == null:
+		return
+	_apply_amount(resource_node.get_amount_remaining())
+
+
+func get_amount_tier() -> AmountTier:
+	return amount_tier
+
+
+func get_amount_ratio() -> float:
+	return amount_ratio
+
+
+func _bind_resource_node() -> void:
+	resource_node = _find_resource_node()
+	if resource_node == null:
+		return
+	if not resource_node.amount_changed.is_connected(_on_resource_amount_changed):
+		resource_node.amount_changed.connect(_on_resource_amount_changed)
+	refresh_from_resource()
+
+
+func _find_resource_node() -> ResourceNode:
+	var candidate := get_parent()
+	while candidate != null:
+		if candidate is ResourceNode:
+			return candidate as ResourceNode
+		candidate = candidate.get_parent()
+	return null
+
+
+func _on_resource_amount_changed(changed_id: StringName, amount_remaining: float) -> void:
+	if resource_node != null and changed_id == resource_node.node_id:
+		_apply_amount(amount_remaining)
+
+
+func _apply_amount(amount_remaining: float) -> void:
+	var initial_amount := maxf(resource_node.initial_amount, 0.0)
+	amount_ratio = (
+		clampf(amount_remaining / initial_amount, 0.0, 1.0) if initial_amount > 0.0 else 0.0
+	)
+	if amount_remaining <= 0.0:
+		amount_tier = AmountTier.DEPLETED
+	elif amount_ratio <= low_amount_ratio:
+		amount_tier = AmountTier.LOW
+	else:
+		amount_tier = AmountTier.FULL
+	_apply_resource_amount_visual(amount_remaining, amount_ratio, amount_tier)
+
+
+func _apply_resource_amount_visual(
+	_amount_remaining: float, _remaining_ratio: float, _tier: AmountTier
+) -> void:
+	pass

world/resource_nodes/ResourceAmountVisual.gd.uid

@@ -0,0 +1 @@
+uid://bls5qs3s3omgh

world/resource_nodes/ResourceNode.gd

@@ -74,6 +74,7 @@ func bind_state(resource_state: ResourceStateRecord) -> bool:
 	if not state.depleted.is_connected(_on_state_depleted):
 		state.depleted.connect(_on_state_depleted)
 	_update_presentation()
+	amount_changed.emit(node_id, state.get_amount_remaining())
 	_notify_world_adapters()
 	return true