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Implement a continuous distribution function using a piecewise linear function for selecting the distance from the player to spawn mobs with, fix crash when no nodes are found under air at the goal position

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This commit is contained in:
teknomunk 2024-04-14 09:52:54 +00:00
parent bd6c8d35c3
commit 1bc0a0b411
1 changed files with 33 additions and 6 deletions
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39
mods/ENTITIES/mcl_mobs/spawning.lua
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@ -596,14 +596,42 @@ function mcl_mobs:spawn_specific(name, dimension, type_of_spawning, biomes, min_
spawn_dictionary[key]["max_height"] = max_height
spawn_dictionary[key]["day_toggle"] = day_toggle
spawn_dictionary[key]["check_position"] = check_position
end
-- Calculate the inverse of a piecewise linear function f(x). Line segments are represented as two
-- adjacent points specified as { x, f(x) }. At least 2 points are required. If there are most solutions,
-- the one with a lower x value will be chosen.
local function inverse_pwl(fx, f)
if fx < f[1][2] then
return f[1][1]
end
for i=2,#f do
local x0,fx0 = unpack(f[i-1])
local x1,fx1 = unpack(f[i ])
if fx < fx1 then
return (fx - fx0) * (x1 - x0) / (fx1 - fx0) + x0
end
end
return f[#f][1]
end
local SPAWN_DISTANCE_CDF_PWL = {
{0.000,0.00},
{0.083,0.40},
{0.416,0.75},
{1.000,1.00},
}
local two_pi = 2 * math.pi
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)
-- Select a distance such that distances closer to the player are selected much more often than
-- those further away from the player.
local fx = (math_random(1,10000)-1) / 10000
local x = inverse_pwl(fx, SPAWN_DISTANCE_CDF_PWL)
distance = x * (MOB_SPAWN_ZONE_OUTER - MOB_SPAWN_ZONE_INNER) + MOB_SPAWN_ZONE_INNER
--print("Using spawn distance of "..tostring(distance).." fx="..tostring(fx)..",x="..tostring(x))
-- TODO Floor xoff and zoff and add 0.5 so it tries to spawn in the middle of the square. Less failed attempts.
-- Use spherical coordinates https://en.wikipedia.org/wiki/Spherical_coordinate_system#Cartesian_coordinates
@ -652,7 +680,7 @@ local function get_next_mob_spawn_pos(pos)
{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"}
)
) or {}
-- Select only the locations at a valid distance
local valid_positions = {}
@ -1232,7 +1260,6 @@ function mob_class:check_despawn(pos, dtime)
end
end
minetest.register_chatcommand("mobstats",{
privs = { debug = true },
func = function(n,param)