Render laser beams cleanly (no ugly cross-section)

mods/lzr_laser/laser.lua

@@ -51,6 +51,48 @@ end
 for i=1, 64 do
 	local dirstring = lzr_laser.dec2bin(i, 6)
 	local dirs = lzr_laser.dirstring_to_dirs(dirstring)
+
+	-- Check which textures to render.
+	-- This looks complicated but serves a simple purpose: To prevent the laser cross-section
+	-- to render, so there is a "clean" laser beam look.
+	-- This works because lzr_laser_laser_nocenter.png.
+	local axes = 0
+	local axes_active = {x=false,y=false,z=false}
+	for a=1,3 do
+		if dirs[a] ~= 0 or dirs[a+3] ~= 0 then
+			axes = axes + 1
+			if a == 1 then
+				axes_active.x = true
+			elseif a == 2 then
+				axes_active.y = true
+			elseif a == 3 then
+				axes_active.z = true
+			end
+		end
+	end
+	local tex
+	if axes == 1 then
+		if axes_active.x then
+			tex = { "lzr_laser_laser.png", "lzr_laser_laser.png", "blank.png", "blank.png", "lzr_laser_laser.png" }
+		elseif axes_active.y then
+			tex = { "blank.png", "blank.png", "lzr_laser_laser.png" }
+		else
+			tex = { "lzr_laser_laser.png", "lzr_laser_laser.png", "lzr_laser_laser.png", "lzr_laser_laser.png", "blank.png" }
+		end
+	elseif axes == 2 then
+		if axes_active.x == false then
+			tex = { "lzr_laser_laser_nocenter.png", "lzr_laser_laser_nocenter.png", "lzr_laser_laser.png", "lzr_laser_laser.png", "lzr_laser_laser_nocenter.png" }
+		elseif axes_active.y == false then
+			tex = { "lzr_laser_laser.png", "lzr_laser_laser.png", "lzr_laser_laser_nocenter.png" }
+		else
+			tex = { "lzr_laser_laser_nocenter.png", "lzr_laser_laser_nocenter.png", "lzr_laser_laser_nocenter.png", "lzr_laser_laser_nocenter.png", "lzr_laser_laser.png" }
+		end
+
+	elseif axes == 3 then
+		tex = { "lzr_laser_laser_nocenter.png" }
+	end
+
+	-- Finally register the laser
 	minetest.register_node("lzr_laser:laser_"..dirstring, {
 		description = S("Laser (@1)", dirstring),
 		paramtype = "light",
@@ -58,7 +100,7 @@ for i=1, 64 do
 		sunlight_propagates = true,
 		walkable = false,
 		use_texture_alpha = "blend",
-		tiles = { "lzr_laser_laser.png", },
+		tiles = tex,
 		pointable = false,
 		buildable_to = true,
 		node_box = {