use soft overlay instead of multi-layer mesh node

init.lua

@@ -95,11 +95,12 @@ FORMALDARKNESS = {
 minetest.register_node("unifiedbricks:brickblock", {
 	description = "Brick Block",
 	tiles = {
-		"unifiedbricks_brickblock.png",
-		{ name = "unifiedbricks_mortar.png", color = 0xffffffff },
+		"unifiedbricks_brickblock.png"
 	},
-	drawtype = "mesh",
-	mesh = "unifiedbricks_brick_block.obj",
+	overlay_tiles = {
+		{ name = "unifiedbricks_mortar.png", color = "white" }
+	},
+	use_texture_alpha = true,
 	paramtype = "light",
 	paramtype2 = "color",
 	palette = "unifieddyes_palette_extended.png",
@@ -150,10 +151,11 @@ minetest.register_node("unifiedbricks:brickblock_multicolor_dark", {
 	description = "Brick block (dark multicolor)",
 	tiles = {
 		"unifiedbricks_brickblock_multicolor_dark.png",
-		{ name = "unifiedbricks_mortar.png", color = 0xffffffff },
 	},
-	drawtype = "mesh",
-	mesh = "unifiedbricks_brick_block.obj",
+	overlay_tiles = {
+		{ name = "unifiedbricks_mortar2.png", color = "white" }
+	},
+	use_texture_alpha = true,
 	paramtype = "light",
 	paramtype2 = "color",
 	palette = "unifieddyes_palette_extended.png",
@@ -169,11 +171,12 @@ minetest.register_node("unifiedbricks:brickblock_multicolor_dark", {
 minetest.register_node("unifiedbricks:brickblock_multicolor_medium", {
 	description = "Brick block (medium multicolor)",
 	tiles = {
-		"unifiedbricks_brickblock_multicolor_medium.png",
-		{ name = "unifiedbricks_mortar.png", color = 0xffffffff },
+		"unifiedbricks_brickblock_multicolor_medium.png"
 	},
-	drawtype = "mesh",
-	mesh = "unifiedbricks_brick_block.obj",
+	overlay_tiles = {
+		{ name = "unifiedbricks_mortar3.png", color = "white" }
+	},
+	use_texture_alpha = true,
 	paramtype = "light",
 	paramtype2 = "color",
 	palette = "unifieddyes_palette_extended.png",
@@ -189,11 +192,12 @@ minetest.register_node("unifiedbricks:brickblock_multicolor_medium", {
 minetest.register_node("unifiedbricks:brickblock_multicolor_light", {
 	description = "Brick block (light multicolor)",
 	tiles = {
-		"unifiedbricks_brickblock_multicolor_light.png",
-		{ name = "unifiedbricks_mortar.png", color = 0xffffffff },
+		"unifiedbricks_brickblock_multicolor_light.png"
 	},
-	drawtype = "mesh",
-	mesh = "unifiedbricks_brick_block.obj",
+	overlay_tiles = {
+		{ name = "unifiedbricks_mortar4.png", color = "white" }
+	},
+	use_texture_alpha = true,
 	paramtype = "light",
 	paramtype2 = "color",
 	palette = "unifieddyes_palette_extended.png",

models/unifiedbricks_brick_block.obj

@@ -1,44 +0,0 @@
-# Blender v2.72 (sub 0) OBJ File: 'unifiedbricks_brick_block.blend'
-# www.blender.org
-o Cube
-v 0.496092 0.496092 0.496092
-v 0.496092 0.496092 -0.496092
-v -0.496092 0.496092 -0.496092
-v -0.496092 0.496092 0.496092
-v 0.496092 -0.496092 0.496092
-v 0.496092 -0.496092 -0.496092
-v -0.496092 -0.496092 -0.496092
-v -0.496092 -0.496092 0.496092
-v 0.499750 0.499750 0.499750
-v 0.499750 0.499750 -0.499750
-v -0.499750 0.499750 -0.499750
-v -0.499750 0.499750 0.499750
-v 0.499750 -0.499750 0.499750
-v 0.499750 -0.499750 -0.499750
-v -0.499750 -0.499750 -0.499750
-v -0.499750 -0.499750 0.499750
-vt 1.000000 0.000000
-vt 1.000000 1.000000
-vt 0.000000 1.000000
-vt 0.000000 0.000000
-vn 0.000000 -1.000000 0.000000
-vn -1.000000 0.000000 0.000000
-vn 0.000000 1.000000 0.000000
-vn 1.000000 0.000000 0.000000
-vn 0.000000 0.000000 -1.000000
-vn 0.000000 0.000000 1.000000
-g Cube_Cube_base
-s off
-f 8/1/1 7/2/1 6/3/1 5/4/1
-f 4/2/2 3/3/2 7/4/2 8/1/2
-f 1/3/3 2/4/3 3/1/3 4/2/3
-f 2/2/4 1/3/4 5/4/4 6/1/4
-f 3/2/5 2/3/5 6/4/5 7/1/5
-f 1/2/6 4/3/6 8/4/6 5/1/6
-g Cube_Cube_overlay
-f 16/1/1 15/2/1 14/3/1 13/4/1
-f 12/2/2 11/3/2 15/4/2 16/1/2
-f 9/3/3 10/4/3 11/1/3 12/2/3
-f 10/2/4 9/3/4 13/4/4 14/1/4
-f 11/2/5 10/3/5 14/4/5 15/1/5
-f 9/2/6 12/3/6 16/4/6 13/1/6