VoxeLibre/mods/ENTITIES/mcl_mobs/api/mob_functions/collision.lua

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local minetest_get_objects_inside_radius = minetest.get_objects_inside_radius
local math_random = math.random
local integer_test = {-1,1}
mobs.collision = function(self)
local pos = self.object:get_pos()
--do collision detection from the base of the mob
local collisionbox = self.object:get_properties().collisionbox
pos.y = pos.y + collisionbox[2]
local collision_boundary = collisionbox[4]
local radius = collision_boundary
if collisionbox[5] > collision_boundary then
radius = collisionbox[5]
end
local collision_count = 0
for _,object in ipairs(minetest_get_objects_inside_radius(pos, radius*1.25)) do
if object and object ~= self.object and (object:is_player() or object:get_luaentity()._cmi_is_mob == true) then--and
--don't collide with rider, rider don't collide with thing
--(not object:get_attach() or (object:get_attach() and object:get_attach() ~= self.object)) and
--(not self.object:get_attach() or (self.object:get_attach() and self.object:get_attach() ~= object)) then
--stop infinite loop
collision_count = collision_count + 1
if collision_count > 100 then
break
end
local pos2 = object:get_pos()
local object_collisionbox = object:get_properties().collisionbox
pos2.y = pos2.y + object_collisionbox[2]
local object_collision_boundary = object_collisionbox[4]
--this is checking the difference of the object collided with's possision
--if positive top of other object is inside (y axis) of current object
local y_base_diff = (pos2.y + object_collisionbox[5]) - pos.y
local y_top_diff = (pos.y + collisionbox[5]) - pos2.y
local distance = vector.distance(vector.new(pos.x,0,pos.z),vector.new(pos2.x,0,pos2.z))
if distance <= collision_boundary + object_collision_boundary and y_base_diff >= 0 and y_top_diff >= 0 then
local dir = vector.direction(pos,pos2)
dir.y = 0
--eliminate mob being stuck in corners
if dir.x == 0 and dir.z == 0 then
--slightly adjust mob position to prevent equal length
--corner/wall sticking
dir.x = dir.x + ((math_random()/10)*integer_test[math.random(1,2)])
dir.z = dir.z + ((math_random()/10)*integer_test[math.random(1,2)])
end
local velocity = dir
--0.5 is the max force multiplier
local force = 0.5 - (0.5 * distance / (collision_boundary + object_collision_boundary))
local vel1 = vector.multiply(velocity, -1.5)
local vel2 = vector.multiply(velocity, 1.5)
vel1 = vector.multiply(vel1, force)
vel2 = vector.multiply(vel2, force)
self.object:add_velocity(vel1)
object:add_velocity(vel2)
end
end
end
end