feat(art): add storybook meadow and woodland villagers

world/presentation/AnimalAppearance.gd

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+class_name AnimalAppearance
+extends RefCounted
+## Disposable woodland identities, rebuilt from stable NPC IDs. No simulation RNG.
+
+const CEL_SHADER := preload("res://world/presentation/materials/storybook_cel.gdshader")
+const SPECIES: Array[StringName] = [&"fox", &"rabbit", &"badger", &"otter"]
+const MODELS: Array[PackedScene] = [
+	preload("res://assets/storybook/fox.glb"),
+	preload("res://assets/storybook/rabbit.glb"),
+	preload("res://assets/storybook/badger.glb"),
+	preload("res://assets/storybook/otter.glb"),
+]
+const PARTS: Array[StringName] = [
+	&"Body", &"Head", &"Hair", &"ArmLeft", &"ArmRight", &"LegLeft", &"LegRight", &"Tail"
+]
+
+
+static func apply_to(root: Node3D, identity: int, npc_body := false) -> void:
+	var index := posmod(identity, MODELS.size())
+	var source := MODELS[index].instantiate()
+	var material := ShaderMaterial.new()
+	material.shader = CEL_SHADER
+	root.set_meta("animal_species", SPECIES[index])
+	for part in PARTS:
+		var source_mesh := source.find_child(String(part), true, false) as MeshInstance3D
+		var target_name := "MeshInstance3D" if npc_body and part == &"Body" else String(part)
+		var target := root.get_node(target_name) as MeshInstance3D
+		assert(source_mesh != null, "Missing Blender animation part: " + String(part))
+		target.mesh = source_mesh.mesh
+		target.material_override = material
+	source.free()
+
+
+static func set_profession_color(root: Node3D, color: Color) -> void:
+	var body := root.get_node("MeshInstance3D") as MeshInstance3D
+	var material := body.material_override as ShaderMaterial
+	material.set_shader_parameter("coat_color", color)
+	material.set_shader_parameter("profession_tint", 0.28)

world/presentation/AnimalAppearance.gd.uid

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+uid://dfb2a5yut45av

world/presentation/materials/storybook_cel.gdshader

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+shader_type spatial;
+render_mode specular_disabled;
+
+// Opaque vertex-painted models: alpha is a clothing mask, never transparency.
+uniform vec4 coat_color : source_color = vec4(1.0);
+uniform float profession_tint : hint_range(0.0, 1.0) = 0.0;
+uniform vec3 shadow_color : source_color = vec3(0.55, 0.64, 0.70);
+uniform float band_softness : hint_range(0.005, 0.2) = 0.045;
+
+void fragment() {
+	ALBEDO = mix(COLOR.rgb, COLOR.rgb * coat_color.rgb * 1.6, COLOR.a * profession_tint);
+	ROUGHNESS = 1.0;
+	SPECULAR = 0.0;
+}
+
+void light() {
+	float diffuse = dot(NORMAL, LIGHT);
+	float mid = smoothstep(-0.15 - band_softness, -0.15 + band_softness, diffuse);
+	float sun = smoothstep(0.50 - band_softness, 0.50 + band_softness, diffuse);
+	vec3 tone = mix(shadow_color * 0.36, vec3(0.70), mid);
+	tone = mix(tone, vec3(1.0, 0.97, 0.87), sun);
+	DIFFUSE_LIGHT += tone * ATTENUATION * LIGHT_COLOR / PI;
+}

world/presentation/materials/storybook_cel.gdshader.uid

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+uid://bs1ip7dyu7jy8

world/presentation/materials/storybook_surface.gdshader

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+shader_type spatial;
+render_mode specular_disabled;
+uniform vec3 albedo : source_color = vec3(0.8, 0.72, 0.52);
+uniform float paint_strength : hint_range(0.0, 0.2) = 0.04;
+varying vec3 paint_position;
+
+void vertex() {
+	paint_position = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xyz;
+}
+
+void fragment() {
+	float brush = sin(paint_position.x * 2.1 + sin(paint_position.y * 3.0)) * sin(paint_position.z * 2.8 + paint_position.y);
+	ALBEDO = albedo * (1.0 + brush * paint_strength);
+	ROUGHNESS = 1.0;
+}
+
+void light() {
+	float ndl = dot(NORMAL, LIGHT);
+	float middle = smoothstep(-0.10, 0.03, ndl);
+	float sunny = smoothstep(0.48, 0.58, ndl);
+	vec3 shade = mix(vec3(0.26, 0.34, 0.40), vec3(0.74), middle);
+	shade = mix(shade, vec3(1.0, 0.97, 0.88), sunny);
+	DIFFUSE_LIGHT += shade * ATTENUATION * LIGHT_COLOR / PI;
+}

world/presentation/materials/storybook_surface.gdshader.uid

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+uid://c8biomtfwtf4w