diff --git a/picotron/wolfenstein_src/main.lua b/picotron/wolfenstein_src/main.lua
index 31a8f05..bb62e23 100644
--- a/picotron/wolfenstein_src/main.lua
+++ b/picotron/wolfenstein_src/main.lua
@@ -1,6 +1,9 @@
 player = {
-	x = nil,
-	y = nil
+	origin = {
+		x= nil,
+		y = nil
+	},
+	dir = nil
 }
 
 col_bg = 1
@@ -10,18 +13,29 @@ function _init()
 	for i=0,31 do
 		for j=0,31 do
 			if mget(i,j) == 5 then -- player id
-				player.x = i
-				player.y = j
+				player.origin.x = i + 0.5
+				player.origin.y = j + 0.5
+				player.dir = math.pi / 2
 				break
 			end
 		end
 		if (player.x) break
 	end
-	print("player: ("..player.x..", "..player.y..")")
+	print("player: ("..player.origin.x..", "..player.origin.y..")")
+end
+
+function cast_ray(origin, angle)
+	
 end
 
 function _draw()
 	cls(col_bg)
 	rectfill(0, 135, 480, 270, col_ground)
+	local fov = 120 -- horizontal
+	local angle_step=(fov / 480) / 360 * math.pi
+	for x=0,480-1 do
+		local angle = (player.dir-(fov/2) + x * angle_step) % (2 * math.pi)
+		local bloc, dist = cast_ray(player.origin, angle)
+	end
 	-- map()
 end