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Change mob spawning randomization from polar coordinates to spherical coordinates, move position validation code from find_spawning_position to get_next_mob_spawn_pos, minimize code remaining in find_spawning_position

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This commit is contained in:
teknomunk 2024-03-17 19:23:06 +00:00
parent 691ba9f5b3
commit 3a4a8799ea
1 changed files with 45 additions and 41 deletions
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86
mods/ENTITIES/mcl_mobs/spawning.lua
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@ -603,17 +603,47 @@ local function get_next_mob_spawn_pos(pos)
-- TODO We should consider spawning something a little further away sporadically.
-- It would be good for sky farms and variance, rather than all being on the 24 - 32 block away radius
local distance = math_random(MOB_SPAWN_ZONE_INNER, MOB_SPAWN_ZONE_MIDDLE)
local angle = math_random() * two_pi
-- TODO Floor xoff and zoff and add 0.5 so it tries to spawn in the middle of the square. Less failed attempts.
local xoff = math_round(distance * math_cos(angle))
local zoff = math_round(distance * math_sin(angle))
return vector.offset(pos, xoff, 0, zoff)
end
-- Use spherical coordinates https://en.wikipedia.org/wiki/Spherical_coordinate_system#Cartesian_coordinates
local theta = math_random() * two_pi
local phi = math_random() * two_pi
local xoff = math_round(distance * math_sin(theta) * math_cos(phi))
local yoff = math_round(distance * math_cos(theta))
local zoff = math_round(distance * math_sin(theta) * math_sin(phi))
local goal_pos = vector.offset(pos, xoff, yoff, zoff)
local function decypher_limits(posy)
posy = math_floor(posy)
return posy - MOB_SPAWN_ZONE_MIDDLE, posy + MOB_SPAWN_ZONE_MIDDLE
if not ( math.abs(goal_pos.x) <= SPAWN_MAPGEN_LIMIT and math.abs(pos.y) <= SPAWN_MAPGEN_LIMIT and math.abs(goal_pos.z) <= SPAWN_MAPGEN_LIMIT ) then
mcl_log("Pos outside mapgen limits: " .. minetest.pos_to_string(goal_pos))
return nil
end
-- Ask engine for valid spawn locations
local spawning_position_list = find_nodes_in_area_under_air(
{x = goal_pos.x, y = math_round(pos.y) - MOB_SPAWN_ZONE_MIDDLE, z = goal_pos.z},
{x = goal_pos.x, y = math_round(pos.y) + MOB_SPAWN_ZONE_MIDDLE, z = goal_pos.z},
{"group:solid", "group:water", "group:lava"}
)
-- Select only the locations at a valid distance
local valid_positions = {}
for _,check_pos in ipairs(spawning_position_list) do
local dist = vector.distance(pos, check_pos)
if dist >= MOB_SPAWN_ZONE_INNER and dist <= MOB_SPAWN_ZONE_OUTER then
valid_positions[#valid_positions + 1] = check_pos
end
end
spawning_position_list = valid_positions
-- No valid locations, failed to find a position
if #spawning_position_list == 0 then
mcl_log("Spawning position isn't good. Do not spawn: " .. minetest.pos_to_string(goal_pos))
return nil
end
-- Pick a random valid location
mcl_log("Spawning positions available: " .. minetest.pos_to_string(goal_pos))
return spawning_position_list[math_random(1, #spawning_position_list)]
end
--a simple helper function for mob_spawn
@ -938,42 +968,16 @@ if mobs_spawn then
local function find_spawning_position(pos, max_times)
local spawning_position
local max_loops = 1
if max_times then max_loops = max_times end
local y_min, y_max = decypher_limits(pos.y)
local max_loops = max_times or 1
--mcl_log("mapgen_limit: " .. SPAWN_MAPGEN_LIMIT)
local i = 0
repeat
local goal_pos = get_next_mob_spawn_pos(pos)
while max_loops > 0 do
local spawning_position = get_next_mob_spawn_pos(pos)
if spawning_position then return spawning_position
max_loops = max_loops - 1
if math.abs(goal_pos.x) <= SPAWN_MAPGEN_LIMIT and math.abs(pos.y) <= SPAWN_MAPGEN_LIMIT and math.abs(goal_pos.z) <= SPAWN_MAPGEN_LIMIT then
local spawning_position_list = find_nodes_in_area_under_air(
{x = goal_pos.x, y = y_min, z = goal_pos.z},
{x = goal_pos.x, y = y_max, z = goal_pos.z},
{"group:solid", "group:water", "group:lava"}
)
if #spawning_position_list > 0 then
mcl_log("Spawning positions available: " .. minetest.pos_to_string(goal_pos))
spawning_position = spawning_position_list[math_random(1, #spawning_position_list)]
else
mcl_log("Spawning position isn't good. Do not spawn: " .. minetest.pos_to_string(goal_pos))
end
else
mcl_log("Pos outside mapgen limits: " .. minetest.pos_to_string(goal_pos))
end
i = i + 1
if i >= max_loops then
mcl_log("Cancel finding spawn positions at: " .. max_loops)
break
end
until spawning_position
return spawning_position
end
return nil
end
local cumulative_chance = nil