diff --git a/.luacheckrc b/.luacheckrc
index 24e3c60..13fa8a9 100644
--- a/.luacheckrc
+++ b/.luacheckrc
@@ -9,8 +9,7 @@ globals = {
 
 read_globals = {
 	-- Builtin
-	table = {fields = {"copy"}},
-
+	"table.copy",
 	"vector",
 	"ItemStack",
 	"DIR_DELIM",
@@ -19,7 +18,8 @@ read_globals = {
 	"default",
 	"mesecon",
 	"screwdriver",
-	"QoS"
+	"QoS",
+	"vizlib",
 }
 
 exclude_files = {
diff --git a/camera.lua b/camera.lua
index 153929c..204a941 100644
--- a/camera.lua
+++ b/camera.lua
@@ -13,8 +13,7 @@ local function get_formspec(enabled)
 	end
 end
 
-local function search_for_players(pos, send_empty)
-	local meta = minetest.get_meta(pos)
+local function get_search_spot(pos, meta)
 	local distance = meta:get_int("distance")
 	local dir = minetest.facedir_to_dir(minetest.get_node(pos).param2)
 	local spot = vector.add(pos, vector.multiply(dir, -distance))
@@ -24,8 +23,15 @@ local function search_for_players(pos, send_empty)
 		node = minetest.get_node(spot)
 	end
 	if node.name == "air" or node.name == "ignore" then
-		return true
+		-- Default to directly in front of camera if ground is not found.
+		spot.y = pos.y
 	end
+	return spot
+end
+
+local function search_for_players(pos, send_empty)
+	local meta = minetest.get_meta(pos)
+	local spot = get_search_spot(pos, meta)
 	local radius = meta:get_int("radius")
 	local found = {}
 	for _,player in pairs(minetest.get_connected_players()) do
@@ -40,6 +46,17 @@ local function search_for_players(pos, send_empty)
 	return true
 end
 
+local function show_area(pos, node, player)
+	if not player or player:get_wielded_item():get_name() ~= "" then
+		-- Only show area when using an empty hand
+		return
+	end
+	local meta = minetest.get_meta(pos)
+	local spot = get_search_spot(pos, meta)
+	local radius = meta:get_int("radius")
+	vizlib.draw_sphere(spot, radius, {player = player})
+end
+
 minetest.register_node("digistuff:camera", {
 	description = "Digilines Camera",
 	tiles = {
@@ -102,6 +119,7 @@ minetest.register_node("digistuff:camera", {
 		end
 	end,
 	on_timer = search_for_players,
+	on_punch = minetest.get_modpath("vizlib") and show_area or nil,
 	digiline = {
 		receptor = {},
 		effector = {
diff --git a/detector.lua b/detector.lua
index aa4d08d..a4d8b02 100644
--- a/detector.lua
+++ b/detector.lua
@@ -28,6 +28,15 @@ local function search_for_players(pos, send_empty)
 	return true
 end
 
+local function show_area(pos, node, player)
+	if not player or player:get_wielded_item():get_name() ~= "" then
+		-- Only show area when using an empty hand
+		return
+	end
+	local radius = minetest.get_meta(pos):get_int("radius")
+	vizlib.draw_sphere(pos, radius, {player = player})
+end
+
 minetest.register_node("digistuff:detector", {
 	description = "Digilines Player Detector",
 	tiles = {
@@ -63,6 +72,7 @@ minetest.register_node("digistuff:detector", {
 		end
 	end,
 	on_timer = search_for_players,
+	on_punch = minetest.get_modpath("vizlib") and show_area or nil,
 	digiline = {
 		receptor = {},
 		effector = {
diff --git a/mod.conf b/mod.conf
index eee7768..28c2af5 100644
--- a/mod.conf
+++ b/mod.conf
@@ -2,4 +2,4 @@ name = digistuff
 title = digistuff
 description = Random digilines devices for Minetest
 depends = digilines
-optional_depends = default,mesecons,mesecons_mvps,screwdriver,pipeworks,qos
+optional_depends = default, mesecons, mesecons_mvps, screwdriver, pipeworks, qos, vizlib