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fix rare edge-case where unknown nodes cause a crash

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When a new mapblock is generated and the mod checks the neighbors around
a target to place a fallen twig, if it finds an unknown node (because
it's in a neighboring, old mapblock from a previous session -- perhaps
an old moss node that hadn't converted-over to wallmounted yet), trying
to check its buildable_to state will fail, since that requires that
there be a node def to look at, which an unknown node wouldn't have.

This substitutes a known not-buildable_to node for those cases, so that
the code won't try to overwrite what it found.
This commit is contained in:
Vanessa Dannenberg 2021-06-23 21:03:06 -04:00
parent 3f107a8067
commit 9ed4771515
1 changed files with 35 additions and 19 deletions
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54
trunks/generating.lua
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@ -4,28 +4,44 @@
-- TWiGS
-----------------------------------------------------------------------------------------------
local fakenode = {
name = "default:stone", -- could be anything that's guaranteed to exist at mapgen time, and isn't buildable_to
param1 = 0,
param2 = 0
}
abstract_trunks.place_twig = function(pos)
local twig_size = math.random(1,27)
local twig_size = math.random(1,27)
local right_here = {x=pos.x , y=pos.y+1, z=pos.z }
local north = {x=pos.x , y=pos.y+1, z=pos.z+1}
local north_east = {x=pos.x+1, y=pos.y+1, z=pos.z+1}
local east = {x=pos.x+1, y=pos.y+1, z=pos.z }
local south_east = {x=pos.x+1, y=pos.y+1, z=pos.z-1}
local south = {x=pos.x , y=pos.y+1, z=pos.z-1}
local south_west = {x=pos.x-1, y=pos.y+1, z=pos.z-1}
local west = {x=pos.x-1, y=pos.y+1, z=pos.z }
local north_west = {x=pos.x-1, y=pos.y+1, z=pos.z+1}
local right_here = {x=pos.x , y=pos.y+1, z=pos.z }
local north = {x=pos.x , y=pos.y+1, z=pos.z+1}
local north_east = {x=pos.x+1, y=pos.y+1, z=pos.z+1}
local east = {x=pos.x+1, y=pos.y+1, z=pos.z }
local south_east = {x=pos.x+1, y=pos.y+1, z=pos.z-1}
local south = {x=pos.x , y=pos.y+1, z=pos.z-1}
local south_west = {x=pos.x-1, y=pos.y+1, z=pos.z-1}
local west = {x=pos.x-1, y=pos.y+1, z=pos.z }
local north_west = {x=pos.x-1, y=pos.y+1, z=pos.z+1}
local node_here = minetest.get_node(right_here)
local node_north = minetest.get_node(north)
local node_n_e = minetest.get_node(north_east)
local node_east = minetest.get_node(east)
local node_s_e = minetest.get_node(south_east)
local node_south = minetest.get_node(south)
local node_s_w = minetest.get_node(south_west)
local node_west = minetest.get_node(west)
local node_n_w = minetest.get_node(north_west)
node_north = minetest.registered_nodes[node_north.name] and node_north or fakenode
node_n_e = minetest.registered_nodes[node_n_e.name] and node_n_e or fakenode
node_east = minetest.registered_nodes[node_east.name] and node_east or fakenode
node_s_e = minetest.registered_nodes[node_s_e.name] and node_s_e or fakenode
node_south = minetest.registered_nodes[node_south.name] and node_south or fakenode
node_s_w = minetest.registered_nodes[node_s_w.name] and node_s_w or fakenode
node_west = minetest.registered_nodes[node_west.name] and node_west or fakenode
node_n_w = minetest.registered_nodes[node_n_w.name] and node_n_w or fakenode
local node_here = minetest.get_node(right_here)
local node_north = minetest.get_node(north)
local node_n_e = minetest.get_node(north_east)
local node_east = minetest.get_node(east)
local node_s_e = minetest.get_node(south_east)
local node_south = minetest.get_node(south)
local node_s_w = minetest.get_node(south_west)
local node_west = minetest.get_node(west)
local node_n_w = minetest.get_node(north_west)
-- small twigs
if twig_size <= 16 then
minetest.swap_node(right_here, {name="trunks:twig_"..math.random(1,4), param2=math.random(0,3)})