improve air detection for tree and giant tree ferns

ferns/gianttreefern.lua

@@ -61,9 +61,15 @@ abstract_ferns.grow_giant_tree_fern = function(pos)
 		}
 	}
 
+	local brk = false
 	for i = 1, size-3 do
+		if minetest.get_node({x = pos.x, y = pos.y + i, z = pos.z}).name ~= "air" then
+			brk = true
+			break
+		end
 		minetest.set_node({x = pos.x, y = pos.y + i, z = pos.z}, {name="ferns:fern_trunk_big"})
 	end
+	if not brk then
 		minetest.set_node({x = pos.x, y = pos.y + size-2, z = pos.z}, {name="ferns:fern_trunk_big_top"})
 		minetest.set_node({x = pos.x, y = pos.y + size-1, z = pos.z}, {name="ferns:tree_fern_leaves_giant"})
 
@@ -90,6 +96,7 @@ abstract_ferns.grow_giant_tree_fern = function(pos)
 			end
 		end
 	end
+end
 
 -----------------------------------------------------------------------------------------------
 -- GIANT TREE FERN LEAVES

ferns/treefern.lua

@@ -26,15 +26,24 @@ abstract_ferns.grow_tree_fern = function(pos)
 	local crown = ({ "ferns:tree_fern_leaves", "ferns:tree_fern_leaves_02" })[math.random(1, 2)]
 	
 	local i = 1
-	while (i < size-1) do
-		if minetest.get_node({x = pos.x, y = pos.y + i + 1, z = pos.z}).name ~= "air" then
+	local brk = false
+	while (i < size) do
+		print(minetest.get_node({x = pos.x, y = pos.y + i, z = pos.z}).name)
+		if minetest.get_node({x = pos.x, y = pos.y + i, z = pos.z}).name ~= "air" then
+			brk = true
+			print("break!")
 			break
 		end
+		print("set trunk node at:")
+		print(dump({x = pos.x, y = pos.y + i, z = pos.z}))
 		minetest.set_node({x = pos.x, y = pos.y + i, z = pos.z}, { name = "ferns:fern_trunk" })
 		i = i + 1
 	end
-
-	minetest.set_node({x = pos.x, y = pos.y + i, z = pos.z}, { name = crown })
+	if not brk then
+		print("set crown node at:")
+		print(dump({x = pos.x, y = pos.y + i, z = pos.z}))
+		minetest.set_node({x = pos.x, y = pos.y + i - 1, z = pos.z}, { name = crown })
+	end
 end
 
 -----------------------------------------------------------------------------------------------