Old Tam speaks (Kokoro); CC0 birdsong, crickets and owls; no plants through floors; menu and marker fixes

scripts/world/props.gd

@@ -165,6 +165,30 @@ func _try_regrow(uid: String) -> void:
 	node.regrow()
 	regrown.emit(uid)
 
+## Clears the pickups (sticks, stones, flax, grass) under a newly built
+## floor, wall or roof: a short ray up from each nearby one finds the piece.
+func clear_under(piece: Node3D) -> void:
+	if not is_instance_valid(piece) or not is_inside_tree():
+		return
+	await get_tree().physics_frame   # (the piece's collider is in the world from the next step)
+	if not is_instance_valid(piece):
+		return
+	var space := get_world_3d().direct_space_state
+	var at := piece.global_position
+	for pk in pickups.values():
+		if not is_instance_valid(pk) or pk.taken:
+			continue
+		var p: Vector3 = pk.global_position
+		if Vector2(p.x - at.x, p.z - at.z).length() > 4.0:
+			continue
+		var q := PhysicsRayQueryParameters3D.create(p + Vector3(0, 0.02, 0), p + Vector3(0, 2.6, 0))
+		q.collision_mask = 4   # building pieces (build_piece.gd BUILD_LAYER)
+		q.hit_from_inside = true   # (a floor's footing reaches into the ground, round the pickup)
+		if not space.intersect_ray(q).is_empty():
+			pk.collected()
+			if Net.is_server():
+				WorldNet.taken(WorldNet.pickup_key(pk))   # (gone for everyone playing too)
+
 ## Something built (or being built) where a tree or rock would come back.
 func _built_over(pos: Vector3, r: float) -> bool:
 	var sph := SphereShape3D.new()