local invref = {}

local function hud_text(text) -- utility
	local array = {name = "vertical"}
	for i = 1, #text do
		table.insert(array, { name = "label", text = text[i] })
	end
	return array
end

local function dump_vec(vec) -- utility
	return vec["x"] .. ":" .. vec["y"] .. ":" .. vec["z"]
end

function checkblock(dtime)
	if not camera then camera = minetest.camera end
	if not camera then return end
	local player = minetest.localplayer
	local cam_v = camera:get_look_dir()
	local cam_p = camera:get_pos()
	local vec_n = { x = cam_p["x"] + (cam_v["x"] * 6), 
			y = cam_p["y"] + (cam_v["y"] * 6),
			z = cam_p["z"] + (cam_v["z"] * 6)
		} -- makes new vector for raycast target
	local raycast = minetest.raycast(cam_p, vec_n, false)
	local node = raycast:next()
	local node_p = { x = 0, y = 0, z = 0 }
	if node then
		node_p = node["under"]
	end
	local ref = ui.draw(hud_text({ -- asks ui lib to render this frame, with debug info
			"Cam pos  " .. dump_vec(cam_p),
			"New pos  " .. dump_vec(vec_n),
			"Cam ang  " .. dump_vec(cam_v),
			"Node         " .. dump_vec(node_p)
		}), 200, 200, invref) 
	invref = ref
end

minetest.register_globalstep(checkblock)