diff --git a/mapgen.lua b/mapgen.lua
index 3c41625..b8b1ed0 100644
--- a/mapgen.lua
+++ b/mapgen.lua
@@ -266,7 +266,7 @@ end
 
 mapgen.getCavePerlinAt = function(pos)
 	cavePointPerlin = cavePointPerlin or minetest.get_perlin(mapgen.np_cave)
-	return cavePointPerlin:get3d(pos)
+	return cavePointPerlin:get_3d(pos)
 end
 
 
@@ -485,7 +485,7 @@ function nether.find_nether_ground_y(target_x, target_z, start_y, player_name)
 	local maxp = {x = maxp_schem.x, y = 0, z = maxp_schem.z}
 
 	for y = start_y, math_max(NETHER_FLOOR + BLEND, start_y - 4096), -1 do
-		local nval_cave = nobj_cave_point:get3d({x = target_x, y = y, z = target_z})
+		local nval_cave = nobj_cave_point:get_3d({x = target_x, y = y, z = target_z})
 
 		if nval_cave > TCAVE then -- Cavern
 			air = air + 1
@@ -509,4 +509,4 @@ function nether.find_nether_ground_y(target_x, target_z, start_y, player_name)
 	return math_max(start_y, NETHER_FLOOR + BLEND) -- Fallback
 end
 
-minetest.register_on_generated(on_generated)
\ No newline at end of file
+minetest.register_on_generated(on_generated)
diff --git a/mapgen_mantle.lua b/mapgen_mantle.lua
index 9d13016..46e6e93 100644
--- a/mapgen_mantle.lua
+++ b/mapgen_mantle.lua
@@ -136,7 +136,7 @@ mapgen.add_basalt_columns = function(data, area, minp, maxp)
 			if basaltNoise > 0 then
 				-- a basalt column is here
 
-				local abs_sealevel_cave_noise = math_abs(cavePerlin:get3d({x = x, y = nearest_sea_level, z = z}))
+				local abs_sealevel_cave_noise = math_abs(cavePerlin:get_3d({x = x, y = nearest_sea_level, z = z}))
 
 				-- Add Some quick deterministic noise to the column heights
 				-- This is probably not good noise, but it doesn't have to be.
diff --git a/mapgen_nobiomes.lua b/mapgen_nobiomes.lua
index 28792b8..1a37128 100644
--- a/mapgen_nobiomes.lua
+++ b/mapgen_nobiomes.lua
@@ -216,7 +216,7 @@ function nether.find_nether_ground_y(target_x, target_z, start_y, player_name)
 	local maxp = {x = maxp_schem.x, y = 0, z = maxp_schem.z}
 
 	for y = start_y, math.max(NETHER_FLOOR + BLEND, start_y - 4096), -1 do
-		local nval_cave = nobj_cave_point:get3d({x = target_x, y = y, z = target_z})
+		local nval_cave = nobj_cave_point:get_3d({x = target_x, y = y, z = target_z})
 
 		if nval_cave > TCAVE then -- Cavern
 			air = air + 1
diff --git a/portal_api.lua b/portal_api.lua
index 57e1658..22d9f34 100644
--- a/portal_api.lua
+++ b/portal_api.lua
@@ -2007,7 +2007,8 @@ local wormhole_nodedef_default = {
 		a = 160, r = 128, g = 0, b = 80
 	},
 	sunlight_propagates = true,
-	use_texture_alpha = true,
+	use_texture_alpha = minetest.features.use_texture_alpha_string_modes
+		and "blend" or true,
 	walkable = false,
 	diggable = false,
 	pointable = false,
@@ -2015,7 +2016,6 @@ local wormhole_nodedef_default = {
 	is_ground_content = false,
 	drop = "",
 	light_source = 5,
-	alpha = 192,
 	node_box = {
 		type = "fixed",
 		fixed = {