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Make wandering mobs avoid cliffs

This commit is contained in:
jordan4ibanez 2021-04-16 15:30:44 -04:00
parent adc683c6a7
commit 2486ffef11
1 changed files with 37 additions and 0 deletions

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@ -1,16 +1,42 @@
local math_random = math.random
local vector_multiply = vector.multiply
local vector_add = vector.add
local minetest_yaw_to_dir = minetest.yaw_to_dir
local minetest_get_item_group = minetest.get_item_group
local minetest_get_node = minetest.get_node
local minetest_line_of_sight = minetest.line_of_sight
local state_list_wandering = {"stand", "walk"}
local DOUBLE_PI = math.pi * 2
local EIGHTH_PI = DOUBLE_PI * 0.125
--this is basically reverse jump_check
local cliff_check = function(self,dtime)
local pos = self.object:get_pos()
pos.y = pos.y + 0.1
local dir = minetest_yaw_to_dir(self.yaw)
local collisionbox = self.object:get_properties().collisionbox
local radius = collisionbox[4] + 0.5
local free_fall, blocker = minetest_line_of_sight(
{x = pos.x + dir.x, y = pos.y, z = pos.z + dir.z},
{x = pos.x + dir.x, y = pos.y - self.fear_height, z = pos.z + dir.z})
return free_fall
end
--a simple helper function which is too small to move into movement.lua
local quick_rotate_45 = function(self,dtime)
self.yaw = self.yaw + EIGHTH_PI
if self.yaw > DOUBLE_PI then
self.yaw = self.yaw - DOUBLE_PI
end
end
--check if a mob needs to jump
local jump_check = function(self,dtime)
@ -84,6 +110,17 @@ local state_execution = function(self,dtime)
--check for nodes to jump over
jump_check(self)
--turn if on the edge of cliff
--(this is written like this because unlike
--jump_check which simply tells the mob to jump
--this requires a mob to turn, removing the
--ease of a full implementation for it in a single
--function)
if cliff_check(self,dtime) then
--turn 45 degrees if so
quick_rotate_45(self,dtime)
end
--print("walk")
elseif self.state == "run" then