Refine NPC fabric UVs and remove baked AO blotches

src/test/tests/test_npc_character.gd

@@ -3,6 +3,7 @@ extends RefCounted
 ## styles, queue slots, LOD tiers/labels, and the articulated rig structure.
 
 const NpcAvatar := preload("res://src/game/npc_avatar.gd")
+const Materials := preload("res://src/game/materials.gd")
 const NpcProfile := preload("res://src/core/npc_profile.gd")
 const Rules := preload("res://src/core/rules.gd")
 
@@ -333,6 +334,33 @@ func test_skinned_outfit_tints_the_material_slots() -> bool:
 	avatar.free()
 	return a and b and c and d
 
+func test_fabric_uv_scale_avoids_the_baked_ao_pattern() -> bool:
+	var avatar := _avatar(Rules.NpcType.TOURIST, 44)
+	var mi := avatar.find_child("npc_base", true, false) as MeshInstance3D
+	var fabric := 0
+	var skin_ao := false
+	var problems: Array[String] = []
+	for index in mi.mesh.get_surface_count():
+		var source := mi.mesh.surface_get_material(index)
+		var material := mi.get_surface_override_material(index) as StandardMaterial3D
+		if source == null or material == null:
+			continue
+		var slot := str(source.resource_name)
+		if slot in ["cloth", "pants"]:
+			fabric += 1
+			if not material.uv1_scale.is_equal_approx(
+					Materials.NPC_FABRIC_UV_SCALE):
+				problems.append("%s uv=%s" % [slot, str(material.uv1_scale)])
+			if material.ao_enabled:
+				problems.append("%s still uses baked AO" % slot)
+		elif slot == "skin" and material.ao_enabled:
+			skin_ao = true
+	var a := TestUtils.check(fabric > 0 and problems.is_empty(),
+		"cloth/pants use the fine-UV scale and skip baked AO (%s)" % str(problems))
+	var b := TestUtils.check(skin_ao, "skin keeps its baked AO")
+	avatar.free()
+	return a and b
+
 func test_forced_fallback_still_builds_the_procedural_rig() -> bool:
 	var profile := NpcProfile.new()
 	profile.id = "fallback_test"