Convert stairs in meshnode

mods/stairs/init.lua

@@ -7,14 +7,22 @@ stairs = {}
 function stairs.register_stair(subname, recipeitem, groups, images, description, sounds)
 	minetest.register_node(":stairs:stair_" .. subname, {
 		description = description,
-		drawtype = "nodebox",
+		drawtype = "mesh",
+		mesh = "stairs.obj",
 		tiles = images,
 		paramtype = "light",
 		paramtype2 = "facedir",
 		is_ground_content = false,
 		groups = groups,
 		sounds = sounds,
-		node_box = {
+		selection_box = {
+			type = "fixed",
+			fixed = {
+				{-0.5, -0.5, -0.5, 0.5, 0, 0.5},
+				{-0.5, 0, 0, 0.5, 0.5, 0.5},
+			},
+		},
+		collision_box = {
 			type = "fixed",
 			fixed = {
 				{-0.5, -0.5, -0.5, 0.5, 0, 0.5},

mods/stairs/models/stairs.obj

@@ -0,0 +1,39 @@
+# Blender v2.72 (sub 0) OBJ File: ''
+# www.blender.org
+o stair
+v -0.500000 -0.500000 0.500000
+v -0.500000 -0.000000 0.500000
+v -0.500000 0.000000 -0.500000
+v -0.500000 -0.500000 -0.500000
+v 0.500000 -0.500000 0.500000
+v 0.500000 -0.500000 -0.500000
+v 0.500000 0.000000 -0.500000
+v 0.500000 -0.000000 0.500000
+v -0.500000 -0.000000 0.500000
+v -0.500000 0.500000 0.500000
+v -0.500000 0.500000 0.000000
+v -0.500000 0.000000 0.000000
+v 0.500000 -0.000000 0.500000
+v 0.500000 0.000000 0.000000
+v 0.500000 0.500000 0.000000
+v 0.500000 0.500000 0.500000
+vt 1.000000 0.000000
+vt 1.000000 0.500000
+vt 0.000000 0.500000
+vt 0.000000 0.000000
+vt 1.000000 1.000000
+vt 0.000000 1.000000
+vt 0.500000 1.000000
+vt 0.500000 0.500000
+s off
+f 1/1 2/2 3/3 4/4
+f 5/4 6/1 7/2 8/3
+f 1/4 5/1 8/2 2/3
+f 4/1 3/2 7/3 6/4
+f 1/1 4/5 6/6 5/4
+f 2/5 8/6 7/4 3/1
+f 9/2 10/5 11/7 12/8
+f 13/3 14/8 15/7 16/6
+f 9/3 13/2 16/5 10/6
+f 12/2 11/5 15/6 14/3
+f 10/5 16/6 15/3 11/2