add transparent vent and mesh

crafts.lua

@@ -1842,3 +1842,21 @@ minetest.register_craft({
         {"scifi_nodes:octbl", 	"", 					"scifi_nodes:octbl"}
     }
 })
+
+minetest.register_craft({
+	output = "scifi_nodes:vent3 4",
+	recipe = {
+        {"scifi_nodes:vent2", 	"", 					"scifi_nodes:vent2"},
+        {"", 					"scifi_nodes:glass", 	""},
+        {"scifi_nodes:vent2", 	"", 					"scifi_nodes:vent2"}
+    }
+})
+
+minetest.register_craft({
+	output = "scifi_nodes:mesh3 4",
+	recipe = {
+        {"scifi_nodes:mesh2", 	"", 					"scifi_nodes:mesh2"},
+        {"", 					"scifi_nodes:glass", 	""},
+        {"scifi_nodes:mesh2", 	"", 					"scifi_nodes:mesh2"}
+    }
+})

nodes.json

@@ -50,6 +50,12 @@
     "vent2": {
         "description": "vent"
     },
+    "vent3": {
+        "description": "transparent vent",
+        "texture_name": "vent2",
+        "texture_modifier": "^[makealpha:33,33,33",
+        "drawtype": "glasslike"
+    },
     "stripes": {
         "description": "hazard stripes",
         "slat": true
@@ -94,6 +100,12 @@
     "mesh2": {
         "description": "metal floormesh"
     },
+    "mesh3": {
+        "description": "transparent metal floormesh",
+        "texture_name": "mesh2",
+        "texture_modifier": "^[makealpha:19,19,19",
+        "drawtype": "glasslike"
+    },
     "pipe": {
         "description": "wall pipe"
     },

nodes.lua

@@ -598,9 +598,15 @@ for name, def in pairs(nodes) do
 		tiles = {"scifi_nodes_" .. def.texture_name .. ".png"}
 	end
 
+	-- optional texture modifier
+	if def.texture_modifier then
+		tiles[1] = tiles[1] .. def.texture_modifier
+	end
+
 	-- Node Definition
 	local node_def = {
 		description = def.description,
+		drawtype = def.drawtype or "normal",
 		tiles = tiles,
 		groups = {cracky=1, dig_generic = 3},
 		is_ground_content = false,