From c43375ff7a5de0c7c1e0b8a371c22abc2b128824 Mon Sep 17 00:00:00 2001
From: Vanessa Ezekowitz <vanessaezekowitz@gmail.com>
Date: Tue, 14 Mar 2017 21:23:33 -0400
Subject: [PATCH] improve air detection for tree and giant tree ferns

---
 ferns/gianttreefern.lua | 47 +++++++++++++++++++++++------------------
 ferns/treefern.lua      | 17 +++++++++++----
 2 files changed, 40 insertions(+), 24 deletions(-)

diff --git a/ferns/gianttreefern.lua b/ferns/gianttreefern.lua
index bc6516b..f6ef9f3 100644
--- a/ferns/gianttreefern.lua
+++ b/ferns/gianttreefern.lua
@@ -61,32 +61,39 @@ 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
-	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"})
+	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"})
 
-	-- all the checking for air below is to prevent some ugly bugs (incomplete trunks of neighbouring trees), it's a bit slower, but worth the result
+		-- all the checking for air below is to prevent some ugly bugs (incomplete trunks of neighbouring trees), it's a bit slower, but worth the result
 
-	-- assert(#leafchecks == 4)
-	for i = 1, 4 do
-		local positions = leafchecks[i].positions
-		local rot = leafchecks[i].direction
-		local endpos = 4	-- If the loop below adds all intermediate leaves then the "terminating" leaf will be at positions[4]
-		-- assert(#positions == 4)
-		-- add leaves so long as the destination nodes are air
-		for j = 1, 3 do
-			if minetest.get_node(positions[j]).name == "air" then
-				minetest.set_node(positions[j], {name="ferns:tree_fern_leave_big"})
-			else
-				endpos = j
-				break
+		-- assert(#leafchecks == 4)
+		for i = 1, 4 do
+			local positions = leafchecks[i].positions
+			local rot = leafchecks[i].direction
+			local endpos = 4	-- If the loop below adds all intermediate leaves then the "terminating" leaf will be at positions[4]
+			-- assert(#positions == 4)
+			-- add leaves so long as the destination nodes are air
+			for j = 1, 3 do
+				if minetest.get_node(positions[j]).name == "air" then
+					minetest.set_node(positions[j], {name="ferns:tree_fern_leave_big"})
+				else
+					endpos = j
+					break
+				end
+			end
+			-- add the terminating leaf if required and possible
+			if endpos == 4 and minetest.get_node(positions[endpos]).name == "air" then
+				minetest.set_node(positions[endpos], {name="ferns:tree_fern_leave_big_end", param2=rot})
 			end
-		end
-		-- add the terminating leaf if required and possible
-		if endpos == 4 and minetest.get_node(positions[endpos]).name == "air" then
-			minetest.set_node(positions[endpos], {name="ferns:tree_fern_leave_big_end", param2=rot})
 		end
 	end
 end
diff --git a/ferns/treefern.lua b/ferns/treefern.lua
index 4ba502b..7ba44d5 100644
--- a/ferns/treefern.lua
+++ b/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
 
 -----------------------------------------------------------------------------------------------