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Check if there is room for tree to grow

Previously tree saplings would grow regardless of the blocks above it.
This could be abused to destroy bedrock and other nodes.

To solve this, checks are added for nodes around the trees.  The volume
checked depends on the tree type.  The volume for each tree has been set
so reject trees where branches would grow into other nodes.  Some nodes
types like torches, plants and wood are ignored in the checks.

Saplings in a 2x2 formation will grow into normal trees if there is no
room for a huge tree.  Oak trees has separate checks for balloon oak
trees and normal oak trees, if there is no room for a balloon oak, it
becomes a normal oak tree.
This commit is contained in:
Elias Åström 2020-05-23 19:37:02 +02:00
parent 547080bd98
commit 2e79f1f0ed
1 changed files with 165 additions and 48 deletions

View File

@ -4,6 +4,13 @@
local mg_name = minetest.get_mapgen_setting("mg_name")
local OAK_TREE_ID = 1
local DARK_OAK_TREE_ID = 2
local SPRUCE_TREE_ID = 3
local ACACIA_TREE_ID = 4
local JUNGLE_TREE_ID = 5
local BIRCH_TREE_ID = 6
minetest.register_abm({
label = "Lava cooling",
nodenames = {"group:lava"},
@ -221,7 +228,97 @@ local function air_leaf(leaftype)
end
end
function mcl_core.generate_tree(pos, tree_type, two_by_two)
-- Check if a node stops a tree from growing. Torches, plants, wood, tree,
-- leaves and dirt does not affect tree growth.
function node_stops_growth(node)
if node.name == 'air' then
return false
end
def = minetest.registered_nodes[node.name]
if not def then
return true
end
groups = def.groups
if not groups then
return true
end
if groups.plant or groups.torch or groups.dirt or groups.tree
or groups.bark or groups.leaves or groups.wood then
return false
end
return true
end
-- Check if a tree can grow at position. The width is the width to check
-- around the tree. A width of 3 and height of 5 will check a 3x3 area, 5
-- nodes above the sapling. If any walkable node other than dirt, wood or
-- leaves occurs in those blocks the tree cannot grow.
function check_growth_width(pos, width, height)
-- Huge tree (with even width to check) will check one more node in
-- positive x and y directions.
neg_space = math.min((width - 1) / 2)
pos_space = math.max((width - 1) / 2)
for x = -neg_space, pos_space do
for z = -neg_space, pos_space do
for y = 1, height do
local np = vector.new(
pos.x + x,
pos.y + y,
pos.z + z)
if node_stops_growth(minetest.get_node(np)) then
return false
end
end
end
end
return true
end
-- Check if a tree with id can grow at a position. Options is a table of flags
-- for varieties of trees. The 'two_by_two' option is used to check if there is
-- room to generate huge trees for spruce and jungle. The 'balloon' option is
-- used to check if there is room to generate a balloon tree for oak.
function check_tree_growth(pos, tree_id, options)
local two_by_two = options and options.two_by_two
local balloon = options and options.balloon
if tree_id == OAK_TREE_ID then
if balloon then
return check_growth_width(pos, 7, 11)
else
return check_growth_width(pos, 3, 5)
end
elseif tree_id == BIRCH_TREE_ID then
return check_growth_width(pos, 3, 6)
elseif tree_id == SPRUCE_TREE_ID then
if two_by_two then
return check_growth_width(pos, 6, 20)
else
return check_growth_width(pos, 5, 11)
end
elseif tree_id == JUNGLE_TREE_ID then
if two_by_two then
return check_growth_width(pos, 8, 23)
else
return check_growth_width(pos, 3, 8)
end
elseif tree_id == ACACIA_TREE_ID then
return check_growth_width(pos, 7, 8)
elseif tree_id == DARK_OAK_TREE_ID and two_by_two then
return check_growth_width(pos, 4, 7)
end
return false
end
-- Generates a tree with a type. Options is a table of flags for varieties of
-- trees. The 'two_by_two' option is used by jungle and spruce trees to
-- generate huge trees. The 'balloon' option is used by oak to generate a balloon
-- oak tree.
function mcl_core.generate_tree(pos, tree_type, options)
pos.y = pos.y-1
local nodename = minetest.get_node(pos).name
@ -231,15 +328,22 @@ function mcl_core.generate_tree(pos, tree_type, two_by_two)
end
local node
if tree_type == nil or tree_type == 1 then
local two_by_two = options and options.two_by_two
local balloon = options and options.balloon
if tree_type == nil or tree_type == OAK_TREE_ID then
if mg_name == "v6" then
mcl_core.generate_v6_oak_tree(pos)
else
if balloon then
mcl_core.generate_balloon_oak_tree(pos)
else
mcl_core.generate_oak_tree(pos)
end
elseif tree_type == 2 and two_by_two then
end
elseif tree_type == DARK_OAK_TREE_ID then
mcl_core.generate_dark_oak_tree(pos)
elseif tree_type == 3 then
elseif tree_type == SPRUCE_TREE_ID then
if two_by_two then
mcl_core.generate_huge_spruce_tree(pos)
else
@ -249,9 +353,9 @@ function mcl_core.generate_tree(pos, tree_type, two_by_two)
mcl_core.generate_spruce_tree(pos)
end
end
elseif tree_type == 4 then
elseif tree_type == ACACIA_TREE_ID then
mcl_core.generate_acacia_tree(pos)
elseif tree_type == 5 then
elseif tree_type == JUNGLE_TREE_ID then
if two_by_two then
mcl_core.generate_huge_jungle_tree(pos)
else
@ -261,7 +365,7 @@ function mcl_core.generate_tree(pos, tree_type, two_by_two)
mcl_core.generate_jungle_tree(pos)
end
end
elseif tree_type == 6 then
elseif tree_type == BIRCH_TREE_ID then
mcl_core.generate_birch_tree(pos)
end
end
@ -331,13 +435,10 @@ function mcl_core.generate_v6_oak_tree(pos)
end
end
-- Oak
function mcl_core.generate_oak_tree(pos)
local r = math.random(1, 12)
-- Ballon Oak
function mcl_core.generate_balloon_oak_tree(pos)
local path
local offset
-- Balloon oak
if r == 1 then
local s = math.random(1, 12)
if s == 1 then
-- Small balloon oak
@ -353,12 +454,14 @@ function mcl_core.generate_oak_tree(pos)
offset = { x = -4, y = -1, z = -4 }
end
end
-- Classic oak
else
path = minetest.get_modpath("mcl_core") .. "/schematics/mcl_core_oak_classic.mts"
offset = { x = -2, y = -1, z = -2 }
minetest.place_schematic(vector.add(pos, offset), path, "random", nil, false)
end
-- Oak
function mcl_core.generate_oak_tree(pos)
local path = minetest.get_modpath("mcl_core") .. "/schematics/mcl_core_oak_classic.mts"
local offset = { x = -2, y = -1, z = -2 }
minetest.place_schematic(vector.add(pos, offset), path, "random", nil, false)
end
@ -833,41 +936,55 @@ local sapling_grow_action = function(tree_id, soil_needed, one_by_one, two_by_tw
local s8 = is_sapling(p8, sapling)
local s9 = is_sapling(p9, sapling)
-- In a 9×9 field there are 4 possible 2×2 squares. We check them all.
if s2 and s3 and s4 then
if s2 and s3 and s4 and check_tree_growth(pos, tree_id, { two_by_two = true }) then
-- Success: Remove saplings and place tree
minetest.remove_node(pos)
minetest.remove_node(p2)
minetest.remove_node(p3)
minetest.remove_node(p4)
mcl_core.generate_tree(pos, tree_id, true)
mcl_core.generate_tree(pos, tree_id, { two_by_two = true })
return
elseif s3 and s5 and s6 then
elseif s3 and s5 and s6 and check_tree_growth(p6, tree_id, { two_by_two = true }) then
minetest.remove_node(pos)
minetest.remove_node(p3)
minetest.remove_node(p5)
minetest.remove_node(p6)
mcl_core.generate_tree(p6, tree_id, true)
mcl_core.generate_tree(p6, tree_id, { two_by_two = true })
return
elseif s6 and s7 and s8 then
elseif s6 and s7 and s8 and check_tree_growth(p7, tree_id, { two_by_two = true }) then
minetest.remove_node(pos)
minetest.remove_node(p6)
minetest.remove_node(p7)
minetest.remove_node(p8)
mcl_core.generate_tree(p7, tree_id, true)
mcl_core.generate_tree(p7, tree_id, { two_by_two = true })
return
elseif s2 and s8 and s9 then
elseif s2 and s8 and s9 and check_tree_growth(p8, tree_id, { two_by_two = true }) then
minetest.remove_node(pos)
minetest.remove_node(p2)
minetest.remove_node(p8)
minetest.remove_node(p9)
mcl_core.generate_tree(p8, tree_id, true)
mcl_core.generate_tree(p8, tree_id, { two_by_two = true })
return
end
end
if one_by_one and tree_id == OAK_TREE_ID then
-- There is a chance that this tree wants to grow as a balloon oak
if math.random(1, 12) == 1 then
-- Check if there is room for that
if check_tree_growth(pos, tree_id, { balloon = true }) then
minetest.set_node(pos, {name="air"})
mcl_core.generate_tree(pos, tree_id, { balloon = true })
return
end
end
end
-- If this sapling can grow alone
if one_by_one then
if one_by_one and check_tree_growth(pos, tree_id) then
-- Single sapling
minetest.set_node(pos, {name="air"})
local r = math.random(1, 12)
mcl_core.generate_tree(pos, tree_id)
return
end
@ -878,12 +995,12 @@ local sapling_grow_action = function(tree_id, soil_needed, one_by_one, two_by_tw
end
end
local grow_oak = sapling_grow_action(1, 1, true, false)
local grow_dark_oak = sapling_grow_action(2, 2, false, true, "mcl_core:darksapling")
local grow_jungle_tree = sapling_grow_action(5, 1, true, true, "mcl_core:junglesapling")
local grow_acacia = sapling_grow_action(4, 2, true, false)
local grow_spruce = sapling_grow_action(3, 1, true, true, "mcl_core:sprucesapling")
local grow_birch = sapling_grow_action(6, 1, true, false)
local grow_oak = sapling_grow_action(OAK_TREE_ID, 1, true, false)
local grow_dark_oak = sapling_grow_action(DARK_OAK_TREE_ID, 2, false, true, "mcl_core:darksapling")
local grow_jungle_tree = sapling_grow_action(JUNGLE_TREE_ID, 1, true, true, "mcl_core:junglesapling")
local grow_acacia = sapling_grow_action(ACACIA_TREE_ID, 2, true, false)
local grow_spruce = sapling_grow_action(SPRUCE_TREE_ID, 1, true, true, "mcl_core:sprucesapling")
local grow_birch = sapling_grow_action(BIRCH_TREE_ID, 1, true, false)
-- Attempts to grow the sapling at the specified position
-- pos: Position