minetest-mods/subterrane-cd2025
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add an API to allow other mods to test positions for the presence of caverns

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This commit is contained in:
FaceDeer 2021-04-10 03:28:13 -06:00
parent 6cc2fe8fae
commit 1f385fc84a
2 changed files with 42 additions and 0 deletions
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1
init.lua
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@ -39,6 +39,7 @@ local modpath = minetest.get_modpath(minetest.get_current_modname())
dofile(modpath.."/defaults.lua")
dofile(modpath.."/features.lua") -- some generic cave features useful for a variety of mapgens
dofile(modpath.."/player_spawn.lua") -- Function for spawning a player in a giant cavern
dofile(modpath.."/test_pos.lua") -- Function other mapgens can use to test if a position is inside a cavern
dofile(modpath.."/legacy.lua") -- contains old node definitions and functions, will be removed at some point in the future.
local disable_mapgen_caverns = function()

41
test_pos.lua Normal file
View File

@ -0,0 +1,41 @@
-- If pos is located inside a cavern volume, returns the list of cavern definitions that
-- are responsible for that cavern volume. If not inside a cavern volume returns an empty list.
-- This is a somewhat expensive function, take care not to use it more than necessary
subterrane.is_in_cavern = function(pos)
local results = {}
for _, cave_layer_def in pairs(subterrane.registered_layers) do
local YMIN = cave_layer_def.y_min
local YMAX = cave_layer_def.y_max
local y = pos.y
if y <= YMAX and y >= YMIN then
local block_size = mapgen_helper.block_size
local BLEND = math.min(cave_layer_def.boundary_blend_range, (YMAX-YMIN)/2)
local TCAVE = cave_layer_def.cave_threshold
local np_cave = cave_layer_def.perlin_cave
local np_wave = cave_layer_def.perlin_wave
local y_blend_min = YMIN + BLEND * 1.5
local y_blend_max = YMAX - BLEND * 1.5
local nval_cave = minetest.get_perlin(np_cave):get_3d(pos) --cave noise for structure
local nval_wave = minetest.get_perlin(np_wave):get_3d(pos) --wavy structure of cavern ceilings and floors
nval_cave = (nval_cave + nval_wave)/2
local cave_local_threshold
if y < y_blend_min then
cave_local_threshold = TCAVE + ((y_blend_min - y) / BLEND) ^ 2
elseif y > y_blend_max then
cave_local_threshold = TCAVE + ((y - y_blend_max) / BLEND) ^ 2
else
cave_local_threshold = TCAVE
end
if cave_layer_def.double_frequency and nval_cave < 0 then
nval_cave = -nval_cave
end
if nval_cave > cave_local_threshold then
table.insert(results, cave_layer_def)
end
end
end
return results
end