Updated Physics and Vitals, New Pathfinding

api.lua

@@ -6,6 +6,7 @@ creatura.api = {}
 
 -- Math --
 
+local abs = math.abs
 local floor = math.floor
 local random = math.random
 
@@ -19,12 +20,6 @@ local function clamp(val, min_n, max_n)
 end
 
 local vec_dist = vector.distance
-local vec_equals = vector.equals
-local vec_add = vector.add
-
-local function vec_center(v)
-	return {x = floor(v.x + 0.5), y = floor(v.y + 0.5), z = floor(v.z + 0.5)}
-end
 
 local function vec_raise(v, n)
 	if not v then return end
@@ -190,7 +185,61 @@ function creatura.is_pos_moveable(pos, width, height)
 	return true
 end
 
-local moveable = creatura.is_pos_moveable
+local function is_blocked_thin(pos, height)
+	local node
+	local pos2 = {
+		x = floor(pos.x + 0.5),
+		y = floor(pos.y + 0.5) - 1,
+		z = floor(pos.z + 0.5)
+	}
+
+	for _ = 1, height do
+		pos2.y = pos2.y + 1
+		node = minetest.get_node_or_nil(pos2)
+
+		if not node
+		or get_node_def(node.name).walkable then
+			return true
+		end
+	end
+	return false
+end
+
+function creatura.is_blocked(pos, width, height)
+	if width <= 0.5 then
+		return is_blocked_thin(pos, height)
+	end
+
+	local p1 = {
+		x = pos.x - (width + 0.2),
+		y = pos.y,
+		z = pos.z - (width + 0.2),
+	}
+	local p2 = {
+		x = pos.x + (width + 0.2),
+		y = pos.y + (height + 0.2),
+		z = pos.z + (width + 0.2),
+	}
+
+	local node
+	local pos2 = {}
+	for z = p1.z, p2.z do
+		pos2.z = z
+		for y = p1.y, p2.y do
+			pos2.y = y
+			for x = p1.x, p2.x do
+				pos2.x = x
+				node = minetest.get_node_or_nil(pos2)
+
+				if not node
+				or get_node_def(node.name).walkable then
+					return true
+				end
+			end
+		end
+	end
+	return false
+end
 
 function creatura.fast_ray_sight(pos1, pos2, water)
 	local ray = minetest.raycast(pos1, pos2, false, water or false)
@@ -207,127 +256,6 @@ end
 
 local fast_ray_sight = creatura.fast_ray_sight
 
-function creatura.get_next_move(self, pos2)
-	local last_move = self._movement_data.last_move
-	local width = self.width
-	local height = self.height
-	local pos = self.object:get_pos()
-	pos = {
-		x = floor(pos.x),
-		y = pos.y + 0.01,
-		z = floor(pos.z)
-	}
-	pos.y = pos.y + 0.01
-	if last_move
-	and last_move.pos then
-		local last_call = minetest.get_position_from_hash(last_move.pos)
-		last_move = minetest.get_position_from_hash(last_move.move)
-		if vec_equals(vec_center(last_call), vec_center(pos)) then
-			return last_move
-		end
-	end
-	local neighbors = {
-		vec_add(pos, {x = 1, y = 0, z = 0}),
-		vec_add(pos, {x = 1, y = 0, z = 1}),
-		vec_add(pos, {x = 0, y = 0, z = 1}),
-		vec_add(pos, {x = -1, y = 0, z = 1}),
-		vec_add(pos, {x = -1, y = 0, z = 0}),
-		vec_add(pos, {x = -1, y = 0, z = -1}),
-		vec_add(pos, {x = 0, y = 0, z = -1}),
-		vec_add(pos, {x = 1, y = 0, z = -1})
-	}
-	local _next
-	table.sort(neighbors, function(a, b)
-		return vec_dist(a, pos2) < vec_dist(b, pos2)
-	end)
-	for i = 1, #neighbors do
-		local neighbor = neighbors[i]
-		local can_move = fast_ray_sight(pos, neighbor)
-		if vec_equals(neighbor, pos2) then
-			can_move = true
-		end
-		if can_move
-		and not moveable(neighbor, width, height) then
-			can_move = false
-			if moveable(vec_raise(neighbor, 0.5), width, height) then
-				can_move = true
-			end
-		end
-		if can_move
-		and not self:is_pos_safe(neighbor) then
-			can_move = false
-		end
-		if can_move then
-			_next = vec_raise(neighbor, 0.1)
-			break
-		end
-	end
-	if _next then
-		self._movement_data.last_move = {
-			pos = minetest.hash_node_position(pos),
-			move = minetest.hash_node_position(_next)
-		}
-		_next = {
-			x = floor(_next.x),
-			y = _next.y,
-			z = floor(_next.z)
-		}
-	end
-	return _next
-end
-
-function creatura.get_next_move_3d(self, pos2)
-	local last_move = self._movement_data.last_move
-	local width = self.width
-	local height = self.height
-	local scan_width = width * 2
-	local pos = self.object:get_pos()
-	pos.y = pos.y + 0.5
-	if last_move
-	and last_move.pos then
-		local last_call = minetest.get_position_from_hash(last_move.pos)
-		last_move = minetest.get_position_from_hash(last_move.move)
-		if vec_equals(vec_center(last_call), vec_center(pos)) then
-			return last_move
-		end
-	end
-	local neighbors = {
-		vec_add(pos, {x = scan_width, y = 0, z = 0}),
-		vec_add(pos, {x = scan_width, y = 0, z = scan_width}),
-		vec_add(pos, {x = 0, y = 0, z = scan_width}),
-		vec_add(pos, {x = -scan_width, y = 0, z = scan_width}),
-		vec_add(pos, {x = -scan_width, y = 0, z = 0}),
-		vec_add(pos, {x = -scan_width, y = 0, z = -scan_width}),
-		vec_add(pos, {x = 0, y = 0, z = -scan_width}),
-		vec_add(pos, {x = scan_width, y = 0, z = -scan_width})
-	}
-	local next
-	table.sort(neighbors, function(a, b)
-		return vec_dist(a, pos2) < vec_dist(b, pos2)
-	end)
-	for i = 1, #neighbors do
-		local neighbor = neighbors[i]
-		local can_move = fast_ray_sight({x = pos.x, y = neighbor.y, z = pos.z}, neighbor)
-		if not moveable(vec_raise(neighbor, 0.6), width, height) then
-			can_move = false
-		end
-		if vec_equals(neighbor, pos2) then
-			can_move = true
-		end
-		if can_move then
-			next = neighbor
-			break
-		end
-	end
-	if next then
-		self._movement_data.last_move = {
-			pos = minetest.hash_node_position(pos),
-			move = minetest.hash_node_position(next)
-		}
-	end
-	return vec_raise(next, clamp((pos2.y - pos.y) + -0.6, -1, 1))
-end
-
 function creatura.sensor_floor(self, range, water)
 	local pos = self.object:get_pos()
 	local pos2 = vec_raise(pos, -range)
@@ -413,6 +341,139 @@ creatura.get_nearby_entities = creatura.get_nearby_objects
 -- Global Mob API --
 --------------------
 
+function creatura.default_water_physics(self)
+	local pos = self.stand_pos
+	local stand_node = self.stand_node
+	if not pos or not stand_node then return end
+	local gravity = self._movement_data.gravity or -9.8
+	local submergence = self.liquid_submergence or 0.25
+	local drag = self.liquid_drag or 0.7
+
+	if minetest.get_item_group(stand_node.name, "liquid") > 0 then -- In Liquid
+		local vel = self.object:get_velocity()
+		if not vel then return end
+
+		self.in_liquid = stand_node.name
+
+		if submergence < 1 then
+			local mob_level = pos.y + (self.height * submergence)
+
+			-- Find Water Surface
+			local nodes = minetest.find_nodes_in_area_under_air(
+				{x = pos.x, y = pos.y, z = pos.z},
+				{x = pos.x, y = pos.y + 3, z = pos.z},
+				"group:liquid"
+			) or {}
+
+			local surface_level = (#nodes > 0 and nodes[#nodes].y or pos.y + self.height + 3)
+			surface_level = floor(surface_level + 0.9)
+
+			local height_diff = mob_level - surface_level
+
+			-- Apply Bouyancy
+			if height_diff <= 0 then
+				local displacement = clamp(abs(height_diff) / submergence, 0.5, 1) * self.width
+
+				self.object:set_acceleration({x = 0, y = displacement, z = 0})
+			else
+				self.object:set_acceleration({x = 0, y = gravity, z = 0})
+			end
+		end
+
+		-- Apply Drag
+		self.object:set_velocity({
+			x = vel.x * (1 - self.dtime * drag),
+			y = vel.y * (1 - self.dtime * drag),
+			z = vel.z * (1 - self.dtime * drag)
+		})
+	else
+		self.in_liquid = nil
+
+		self.object:set_acceleration({x = 0, y = gravity, z = 0})
+	end
+end
+
+function creatura.default_vitals(self)
+	local pos = self.stand_pos
+	local node = self.stand_node
+	if not pos or node then return end
+
+	local max_fall = self.max_fall or 3
+	local in_liquid = self.in_liquid
+	local on_ground = self.touching_ground
+	local damage = 0
+
+	-- Fall Damage
+	if max_fall > 0
+	and not in_liquid then
+		local fall_start = self._fall_start or (not on_ground and pos.y)
+		if fall_start
+		and on_ground then
+			damage = floor(fall_start - pos.y)
+			if damage < max_fall then
+				damage = 0
+			else
+				local resist = self.fall_resistance or 0
+				damage = damage - damage * resist
+			end
+			fall_start = nil
+		end
+		self._fall_start = fall_start
+	end
+
+	-- Environment Damage
+	if self:timer(1) then
+		local stand_def = creatura.get_node_def(node.name)
+		local max_breath = self.max_breath or 0
+
+		-- Suffocation
+		if max_breath > 0 then
+			local head_pos = {x = pos.x, y = pos.y + self.height, z = pos.z}
+			local head_def = creatura.get_node_def(head_pos)
+			if head_def.groups
+			and (minetest.get_item_group(head_def.name, "water") > 0
+			or (head_def.walkable
+			and head_def.groups.disable_suffocation ~= 1
+			and head_def.drawtype == "normal")) then
+				local breath = self._breath
+				if breath <= 0 then
+					damage = damage + 1
+				else
+					self._breath = breath - 1
+					self:memorize("_breath", breath)
+				end
+			end
+		end
+
+		-- Burning
+		local fire_resist = self.fire_resistance or 0
+		if fire_resist < 1
+		and minetest.get_item_group(stand_def.name, "igniter") > 0
+		and stand_def.damage_per_second then
+			damage = (damage or 0) + stand_def.damage_per_second * fire_resist
+		end
+	end
+
+	-- Apply Damage
+	if damage > 0 then
+		self:hurt(damage)
+		self:indicate_damage()
+		if random(4) < 2 then
+			self:play_sound("hurt")
+		end
+	end
+
+	-- Entity Cramming
+	if self:timer(5) then
+		local objects = minetest.get_objects_inside_radius(pos, 0.2)
+		if #objects > 10 then
+			self:indicate_damage()
+			self.hp = self:memorize("hp", -1)
+			self:death_func()
+		end
+	end
+end
+
 function creatura.drop_items(self)
 	if not self.drops then return end
 	local pos = self.object:get_pos()

doc.txt

@@ -213,4 +213,27 @@ Global Mob API
 * `creatura.basic_punch_func(self, puncher, time_from_last_punch, tool_capabilities, direction, damage)`
 	* Deals damage
 	* Applies knockback
-	* Visualy and audibly indicates damage
+	* Visualy and audibly indicates damage
+
+Pathfinding
+-----------
+
+Creatura's pathfinder uses the A* algorithm for speed, as well as Theta* for decent performance and more natural looking paths.
+
+Both pathfinders will carry out pathfinding over multiple server steps to reduce lag spikes which does result in the path not
+being returned immediately, so your code will have to account for this.
+
+The maximum amount of time the pathfinder can spend per-step (in microseconds) can be adjusted in settings.
+	
+
+* `creatura.pathfinder.find_path(self, pos1, pos2, get_neighbors)`
+	* Finds a path from `pos1` to `pos2`
+	* `get_neighbors` is a function used to find valid neighbors
+		* `creatura.pathfinder.get_neighbors_fly` and `creatura.pathfinder.get_neighbors_swim` are bundled by default
+
+
+* `creatura.pathfinder.find_path_theta(self, pos1, pos2, get_neighbors)`
+	* Finds a path from `pos1` to `pos2`
+	* Returns a path with arbitrary angles for natural looking paths at the expense of performance
+	* `get_neighbors` is a function used to find valid neighbors
+		* `creatura.pathfinder.get_neighbors_fly` and `creatura.pathfinder.get_neighbors_swim` are bundled by default

init.lua

@@ -3,7 +3,8 @@ creatura = {}
 local path = minetest.get_modpath("creatura")
 
 dofile(path.."/api.lua")
-dofile(path.."/pathfinder.lua")
+dofile(path.."/pathfinding.lua")
+dofile(path.."/pathfinder_deprecated.lua")
 dofile(path.."/methods.lua")
 
 -- Optional Files --

methods.lua

@@ -468,49 +468,41 @@ end
 	return path
 end]]
 
-creatura.register_movement_method("creatura:theta_pathfind", function(self)
+creatura.register_movement_method("creatura:pathfind_theta", function(self)
 	local path = {}
-	local box = clamp(self.width, 0.5, 1.5)
+	local steer_to
+	local steer_int = 0
+	local arrival_threshold = clamp(self.width, 0.5, 1)
+
+	self:set_gravity(-9.8)
 	local function func(_self, goal, speed_factor)
 		local pos = _self.object:get_pos()
-		if not pos then return end
-		pos.y = pos.y + 0.5
-		-- Return true when goal is reached
-		if vec_dist(pos, goal) < box * 1.33 then
+		if not pos or not goal then return end
+
+		if vec_dist(pos, goal) < arrival_threshold then
 			_self:halt()
 			return true
 		end
-		self:set_gravity(-9.8)
-		-- Get movement direction
-		local steer_to = get_avoidance_dir(_self, goal)
-		local goal_dir = vec_dir(pos, goal)
-		if steer_to then
-			goal_dir = steer_to
-			if #path < 1 then
-				path = creatura.find_theta_path(_self, pos, goal, _self.width, _self.height, 300) or {}
-			end
-		end
-		if #path > 0 then
-			goal_dir = vec_dir(pos, path[2] or path[1])
-			if vec_dist(pos, path[1]) < box then
-				table.remove(path, 1)
-			end
-		end
-		local yaw = _self.object:get_yaw()
-		local goal_yaw = dir2yaw(goal_dir)
-		local speed = abs(_self.speed or 2) * speed_factor or 0.5
+
+		-- Calculate Movement
 		local turn_rate = abs(_self.turn_rate or 5)
-		-- Movement
-		local yaw_diff = abs(diff(yaw, goal_yaw))
-		if yaw_diff < pi * 0.25
-		or steer_to then
-			_self:set_forward_velocity(speed)
-		else
-			_self:set_forward_velocity(speed * 0.33)
-		end
-		if yaw_diff > 0.1 then
-			_self:turn_to(goal_yaw, turn_rate)
+		local speed = abs(_self.speed or 2) * speed_factor or 0.5
+		local path_dir = #path > 0 and vec_dir(pos, path[2] or path[1])
+
+		steer_int = (steer_int > 0 and steer_int - _self.dtime) or 1 / math.max(speed, 1)
+		steer_to = path_dir or (steer_int <= 0 and creatura.calc_steering(_self, goal)) or steer_to
+
+		path = (#path > 0 and path) or (creatura.pathfinder.find_path_theta(_self, pos, goal) or {})
+
+		if path_dir
+		and ((path[2] and vec_dist(pos, path[2]) < arrival_threshold)
+		or vec_dist(pos, path[1]) < arrival_threshold) then
+			table.remove(path, 1)
 		end
+
+		-- Apply Movement
+		_self:turn_to(dir2yaw(steer_to or vec_dir(pos, goal)), turn_rate)
+		_self:set_forward_velocity(speed)
 	end
 	return func
 end)
@@ -519,25 +511,34 @@ creatura.register_movement_method("creatura:pathfind", function(self)
 	local path = {}
 	local steer_to
 	local steer_int = 0
+	local arrival_threshold = clamp(self.width, 0.5, 1)
+
 	self:set_gravity(-9.8)
 	local function func(_self, goal, speed_factor)
 		local pos = _self.object:get_pos()
 		if not pos or not goal then return end
-		if vec_dist(pos, goal) < clamp(self.width, 0.5, 1) then
+
+		if vec_dist(pos, goal) < arrival_threshold then
 			_self:halt()
 			return true
 		end
+
 		-- Calculate Movement
 		local turn_rate = abs(_self.turn_rate or 5)
 		local speed = abs(_self.speed or 2) * speed_factor or 0.5
-		steer_int = (not steer_to and steer_int > 0 and steer_int - _self.dtime) or 1 / math.max(speed, 1)
-		steer_to = (steer_int <= 0 and creatura.calc_steering(_self, goal)) or steer_to
-		if steer_to then
-			path = creatura.find_lvm_path(_self, pos, goal, _self.width, _self.height, 400) or {}
-			if #path > 0 then
-				steer_to = vec_dir(pos, path[2] or path[1])
-			end
+		local path_dir = #path > 0 and vec_dir(pos, path[2] or path[1])
+
+		steer_int = (steer_int > 0 and steer_int - _self.dtime) or 1 / math.max(speed, 1)
+		steer_to = path_dir or (steer_int <= 0 and creatura.calc_steering(_self, goal)) or steer_to
+
+		path = (#path > 0 and path) or (creatura.pathfinder.find_path(_self, pos, goal) or {})
+
+		if path_dir
+		and ((path[2] and vec_dist(pos, path[2]) < arrival_threshold + 0.5)
+		or vec_dist(pos, path[1]) < arrival_threshold) then
+			table.remove(path, 1)
 		end
+
 		-- Apply Movement
 		_self:turn_to(dir2yaw(steer_to or vec_dir(pos, goal)), turn_rate)
 		_self:set_forward_velocity(speed)
@@ -545,6 +546,7 @@ creatura.register_movement_method("creatura:pathfind", function(self)
 	return func
 end)
 
+
 -- Steering
 
 creatura.register_movement_method("creatura:steer_small", function(self)

mob_meta.lua

@@ -87,8 +87,8 @@ local mob = {
 	},
 	follow = {},
 	fancy_collide = false,
-	bouyancy_multiplier = 1,
-	hydrodynamics_multiplier = 1
+	liquid_submergence = 0.25,
+	liquid_drag = 1
 
 }
 
@@ -505,12 +505,11 @@ function mob:set_mesh(id)
 		self.object:set_properties({
 			mesh = meshes[mesh_no]
 		})
-		self:memorize("mesh_no", self.mesh_no)
+		self.mesh_no = mesh_no
 		if self.mesh_textures then
 			self.textures = self.mesh_textures[mesh_no]
 			self.texture_no = random(#self.textures)
 			self:set_texture(self.texture_no, self.textures)
-			self:memorize("texture_no", self.texture_no)
 		end
 		return meshes[mesh_no]
 	end
@@ -818,22 +817,20 @@ function mob:activate(staticdata, dtime)
 	end
 
 	-- Initialize Stats and Visuals
+	if self.meshes
+	and #self.meshes > 0 then
+		if not self.mesh_no
+		or not self.meshes[self.mesh_no] then
+			self.mesh_no = random(#self.meshes)
+		end
+		self:set_mesh(self.mesh_no)
+	end
+
 	if not self.textures then
 		local textures = self:get_props().textures
 		if textures then self.textures = textures end
 	end
 
-	if self.meshes then
-		local mesh_no = self.mesh_no or random(#self.meshes)
-		if self.mesh_textures then
-			self.textures = self.mesh_textures[mesh_no]
-		end
-		self.mesh_no = mesh_no
-		self.object:set_properties({
-			mesh = self.meshes[mesh_no]
-		})
-	end
-
 	if not self.perm_data then
 		if self.memory then
 			self.perm_data = self.memory
@@ -857,11 +854,14 @@ function mob:activate(staticdata, dtime)
 		return
 	end
 
-	self._breath =  self:recall("_breath") or (self.max_breath or 30)
+	self._breath = self:recall("_breath") or (self.max_breath or 30)
 	--self._border = index_box_border(self)
 
 	if self.textures
 	and self.texture_no then
+		if not self.textures[self.texture_no] then
+			self.texture_no = random(#self.textures)
+		end
 		self:set_texture(self.texture_no, self.textures)
 	end
 
@@ -960,11 +960,11 @@ function mob:on_step(dtime, moveresult)
 	end
 end
 
-function mob:on_deactivate()
+function mob:on_deactivate(removal)
 	self._task = {}
 	self._action = {}
 	if self.deactivate_func then
-		self:deactivate_func(self)
+		self:deactivate_func(removal)
 	end
 end
 
@@ -1005,65 +1005,14 @@ local function collision_detection(self)
 	end
 end
 
-local function water_physics(self, pos, node)
-	-- Props
-	local gravity = self._movement_data.gravity
-	local height = self.height
-	-- Vectors
-	pos.y = pos.y + 0.01
-	if minetest.get_item_group(node.name, "liquid") < 1 then
-		self.object:set_acceleration({
-			x = 0,
-			y = gravity,
-			z = 0
-		})
-		if self.in_liquid then
-			self.in_liquid = false
-		end
-		return
-	end
-	self.in_liquid = node.name
-	self.object:set_acceleration({
-		x = 0,
-		y = gravity * 0.5,
-		z = 0
-	})
-	local center = {
-		x = pos.x,
-		y = pos.y + height * 0.5,
-		z = pos.z
-	}
-	if minetest.get_item_group(minetest.get_node(center).name, "liquid") < 1 then
-		return
-	end
-	-- Calculate Physics
-	local vel = self.object:get_velocity()
-	local bouyancy_x = self.bouyancy_multiplier or 1
-	local bouyancy =  (abs(gravity * 0.5) / height) * bouyancy_x
-	if bouyancy > 0 then
-		if bouyancy > 4.9 then bouyancy = 4.9 end
-		self.object:set_acceleration({
-			x = 0,
-			y = 0,
-			z = 0
-		})
-		vel.y = vel.y + (bouyancy - vel.y) * (self.dtime * 0.5)
-	end
-	local hydrodynamics_x = self.hydrodynamics_multiplier or 0.7
-	vel.x = vel.x * hydrodynamics_x
-	vel.y = vel.y * ((bouyancy == 0 and hydrodynamics_x) or 1)
-	vel.z = vel.z * hydrodynamics_x
-	-- Apply Physics
-	self.object:set_velocity(vel)
-end
+local mob_friction = 7
 
 function mob:_physics()
-	local pos = self.stand_pos
-	local node = self.stand_node
-	if not pos or not node then return end
-	water_physics(self, pos, node)
-	-- Object collision
+	-- Physics
+	creatura.default_water_physics(self)
 	collision_detection(self)
+
+	-- Cache Environment Info
 	local in_liquid = self.in_liquid
 	local on_ground = self.touching_ground
 	if not in_liquid
@@ -1077,9 +1026,7 @@ function mob:_physics()
 	--and not move_data.func
 	and move_data.gravity ~= 0 then
 		local vel = self.object:get_velocity()
-		local friction = self.dtime * 10
-		if friction > 0.5 then friction = 0.5 end
-		if not on_ground then friction = 0.25 end
+		local friction = math.min(self.dtime * mob_friction, 0.5)
 		local nvel = {x = vel.x * (1 - friction), y = vel.y, z = vel.z * (1 - friction)}
 		self.object:set_velocity(nvel)
 	end
@@ -1124,6 +1071,8 @@ function mob:_execute_utilities()
 			step_delay = nil,
 			score = 0
 		}
+	end
+	if not self._util_cooldown then
 		self._util_cooldown = {}
 	end
 	local loop_data = {
@@ -1182,6 +1131,7 @@ function mob:_execute_utilities()
 			self._util_cooldown[i] = cooldown
 		end
 	end
+
 	if loop_data.utility
 	and loop_data.args then
 		if not self._utility_data
@@ -1197,7 +1147,8 @@ function mob:_execute_utilities()
 			end
 		end
 	end
-	if self._utility_data.utility then
+
+	if self._utility_data.utility then -- If a utility is currently selected
 		local util_data = self._utility_data
 		if not util_data.func then
 			self:initiate_utility(util_data.utility, unpack(util_data.args))
@@ -1255,78 +1206,6 @@ end
 
 -- Vitals
 
-function mob:_vitals()
-	local pos = self.stand_pos
-	local node = self.stand_node
-	if not pos or not node then return end
-	local max_fall = self.max_fall or 3
-	local in_liquid = self.in_liquid
-	local on_ground = self.touching_ground
-	local damage = 0
-	if max_fall > 0
-	and not in_liquid then
-		local fall_start = self._fall_start or (not on_ground and pos.y)
-		if fall_start then
-			if on_ground then
-				damage = fall_start - pos.y
-				if damage < max_fall then
-					damage = 0
-				else
-					local resist = self.fall_resistance or 0
-					damage = damage - damage * resist
-				end
-				fall_start = nil
-			end
-		end
-		self._fall_start = fall_start
-	end
-	if self:timer(1) then
-		local stand_def = creatura.get_node_def(node.name)
-		local max_breath = self.max_breath
-		if not max_breath
-		or max_breath > 0 then
-			local breath = self._breath or max_breath
-			local head_pos = vec_raise(pos, self.height - 0.01)
-			local head_def = creatura.get_node_def(head_pos)
-			if minetest.get_item_group(head_def.name, "liquid") > 0
-			or (head_def.walkable
-			and head_def.drawtype == "normal") then
-				if breath <= 0 then
-					damage = (damage or 0) + 1
-				else
-					breath = breath - 1
-				end
-			else
-				breath = (breath < max_breath and breath + 1) or max_breath
-			end
-			self._breath = self:memorize("_breath", breath)
-		end
-		if (not self.fire_resistance
-		or self.fire_resistance < 1)
-		and minetest.get_item_group(stand_def.name, "igniter") > 0
-		and stand_def.damage_per_second then
-			local resist = self.fire_resistance or 0.5
-			damage = (damage or 0) + stand_def.damage_per_second * resist
-		end
-	end
-	if damage > 0 then
-		self:hurt(damage)
-		self:indicate_damage()
-		if random(4) < 2 then
-			self:play_sound("hurt")
-		end
-	end
-	-- Entity Cramming
-	if self:timer(5) then
-		local objects = minetest.get_objects_inside_radius(pos, 0.2)
-		if #objects > 10 then
-			self:indicate_damage()
-			self.hp = self:memorize("hp", -1)
-			self:death_func()
-		end
-	end
-end
-
 function creatura.register_mob(name, def)
 	local box_width = def.hitbox and def.hitbox.width or 0.5
 	local box_height = def.hitbox and def.hitbox.height or 1
@@ -1354,6 +1233,8 @@ function creatura.register_mob(name, def)
 		}
 	end
 
+	def._vitals = def._vitals or creatura.default_vitals
+
 	def.on_activate = function(self, staticdata, dtime)
 		return self:activate(staticdata, dtime)
 	end

pathfinding.lua

@@ -0,0 +1,620 @@
+-----------------
+-- Pathfinding --
+-----------------
+
+local a_star_alloted_time = tonumber(minetest.settings:get("creatura_a_star_alloted_time")) or 500
+local theta_star_alloted_time = tonumber(minetest.settings:get("creatura_theta_star_alloted_time")) or 700
+
+creatura.pathfinder = {}
+
+local max_open = 300
+
+-- Math
+
+local floor = math.floor
+local abs = math.abs
+
+local vec_add, vec_dist, vec_new, vec_round = vector.add, vector.distance, vector.new, vector.round
+
+local function vec_raise(v, n)
+	return {x = v.x, y = v.y + n, z = v.z}
+end
+
+-- Heuristic
+
+local function get_distance(start_pos, end_pos)
+	local distX = abs(start_pos.x - end_pos.x)
+	local distZ = abs(start_pos.z - end_pos.z)
+
+	if distX > distZ then
+		return 14 * distZ + 10 * (distX - distZ)
+	else
+		return 14 * distX + 10 * (distZ - distX)
+	end
+end
+
+local function get_distance_to_neighbor(start_pos, end_pos)
+	local distX = abs(start_pos.x - end_pos.x)
+	local distY = abs(start_pos.y - end_pos.y)
+	local distZ = abs(start_pos.z - end_pos.z)
+
+	if distX > distZ then
+		return (14 * distZ + 10 * (distX - distZ)) * (distY + 1)
+	else
+		return (14 * distX + 10 * (distZ - distX)) * (distY + 1)
+	end
+end
+
+-- Blocked Movement Checks
+
+local is_blocked = creatura.is_blocked
+
+local function get_line_of_sight(a, b)
+	local steps = floor(vec_dist(a, b))
+	local line = {}
+
+	for i = 0, steps do
+		local pos
+
+		if steps > 0 then
+			pos = {
+				x = a.x + (b.x - a.x) * (i / steps),
+				y = a.y + (b.y - a.y) * (i / steps),
+				z = a.z + (b.z - a.z) * (i / steps)
+			}
+		else
+			pos = a
+		end
+		table.insert(line, pos)
+	end
+
+	if #line < 1 then
+		return false
+	else
+		for i = 1, #line do
+			local node = minetest.get_node(line[i])
+			if creatura.get_node_def(node.name).walkable then
+				return false
+			end
+		end
+	end
+	return true
+end
+
+local function is_on_ground(pos)
+	local ground = {
+		x = pos.x,
+		y = pos.y - 1,
+		z = pos.z
+	}
+	if creatura.get_node_def(ground).walkable then
+		return true
+	end
+	return false
+end
+
+-- Neighbor Check Grids
+
+local neighbor_grid = {
+	{x = 1, y = 0, z = 0},
+	{x = 1, y = 0, z = 1},
+	{x = 0, y = 0, z = 1},
+	{x = -1, y = 0, z = 1},
+	{x = -1, y = 0, z = 0},
+	{x = -1, y = 0, z = -1},
+	{x = 0, y = 0, z = -1},
+	{x = 1, y = 0, z = -1}
+}
+
+local neighbor_grid_climb = {
+	{x = 1, y = 0, z = 0},
+	{x = 1, y = 0, z = 1},
+	{x = 0, y = 0, z = 1},
+	{x = -1, y = 0, z = 1},
+	{x = -1, y = 0, z = 0},
+	{x = -1, y = 0, z = -1},
+	{x = 0, y = 0, z = -1},
+	{x = 1, y = 0, z = -1},
+
+	{x = 0, y = 1, z = 0},
+	{x = 0, y = -1, z = 0}
+}
+
+local neighbor_grid_3d = {
+	-- Central
+	{x = 1, y = 0, z = 0},
+	{x = 0, y = 0, z = 1},
+	{x = -1, y = 0, z = 0},
+	{x = 0, y = 0, z = -1},
+	-- Directly Up or Down
+	{x = 0, y = 1, z = 0},
+	{x = 0, y = -1, z = 0}
+}
+
+-- Get Neighbors
+
+local function get_neighbors(pos, width, height, open, closed, parent)
+	local result = {}
+	local neighbor
+	local can_move
+	local hashed_pos
+	local step
+
+	for i = 1, #neighbor_grid do
+		neighbor = vec_add(pos, neighbor_grid[i])
+		can_move = get_line_of_sight({x = pos.x, y = neighbor.y, z = pos.z}, neighbor)
+		hashed_pos = minetest.hash_node_position(neighbor)
+
+		if parent
+		and vec_dist(parent, neighbor) < vec_dist(pos, neighbor) then
+			can_move = false
+		end
+
+		if open[hashed_pos]
+		or closed[hashed_pos] then
+			can_move = false
+		elseif can_move then
+			can_move = not is_blocked(neighbor, width, height)
+
+			if not can_move then -- Step Up
+				step = vec_raise(neighbor, 1)
+				can_move = not is_blocked(vec_round(step), width, height)
+				neighbor = vec_round(step)
+			else
+				step = creatura.get_ground_level(vec_new(neighbor), 1)
+				if step.y < neighbor.y
+				and not is_blocked(vec_round(step), width, height) then
+					neighbor = step
+				end
+			end
+		end
+
+		if can_move then
+			table.insert(result, neighbor)
+		end
+	end
+	return result
+end
+
+function creatura.pathfinder.get_neighbors_climb(pos, width, height, open, closed)
+	local result = {}
+	local neighbor
+	local can_move
+	local hashed_pos
+	local step
+
+	for i = 1, #neighbor_grid_climb do
+		neighbor = vec_add(pos, neighbor_grid_climb[i])
+		can_move = get_line_of_sight({x = pos.x, y = neighbor.y, z = pos.z}, neighbor)
+		hashed_pos = minetest.hash_node_position(neighbor)
+
+		if open[hashed_pos]
+		or closed[hashed_pos] then
+			can_move = false
+		elseif can_move then
+			can_move = not is_blocked(neighbor, width, height)
+
+			if not can_move then -- Step Up
+				step = vec_raise(neighbor, 1)
+				can_move = not is_blocked(vec_round(step), width, height)
+				neighbor = vec_round(step)
+			elseif i < 9 then
+				step = creatura.get_ground_level(vec_new(neighbor), 1)
+				if step.y < neighbor.y
+				and not is_blocked(vec_round(step), width, height) then
+					neighbor = step
+				end
+			end
+		end
+
+		if can_move then
+			table.insert(result, neighbor)
+		end
+	end
+	return result
+end
+
+function creatura.pathfinder.get_neighbors_fly(pos, width, height, open, closed, parent)
+	local result = {}
+	local neighbor
+	local can_move
+	local hashed_pos
+
+	for i = 1, #neighbor_grid_3d do
+		neighbor = vec_add(pos, neighbor_grid_3d[i])
+		can_move = get_line_of_sight({x = pos.x, y = pos.y, z = pos.z}, neighbor)
+		hashed_pos = minetest.hash_node_position(neighbor)
+
+		if parent
+		and vec_dist(parent, neighbor) < vec_dist(pos, neighbor) then
+			can_move = false
+		end
+
+		if open[hashed_pos]
+		or closed[hashed_pos] then
+			can_move = false
+		elseif can_move then
+			can_move = not is_blocked(neighbor, width, height)
+		end
+
+		if can_move then
+			table.insert(result, neighbor)
+		end
+	end
+	return result, true
+end
+
+function creatura.pathfinder.get_neighbors_swim(pos, width, height, open, closed, parent)
+	local result = {}
+	local neighbor
+	local can_move
+	local hashed_pos
+
+	for i = 1, #neighbor_grid_3d do
+		neighbor = vec_add(pos, neighbor_grid_3d[i])
+		can_move = get_line_of_sight({x = pos.x, y = pos.y, z = pos.z}, neighbor)
+		hashed_pos = minetest.hash_node_position(neighbor)
+
+		if (parent
+		and vec_dist(parent, neighbor) < vec_dist(pos, neighbor))
+		or creatura.get_node_def(neighbor).drawtype ~= "liquid" then
+			can_move = false
+		end
+
+		if open[hashed_pos]
+		or closed[hashed_pos] then
+			can_move = false
+		elseif can_move then
+			can_move = not is_blocked(neighbor, width, height)
+		end
+
+		if can_move then
+			table.insert(result, neighbor)
+		end
+	end
+	return result, true
+end
+
+-- A*
+
+function creatura.pathfinder.find_path(self, pos1, pos2, neighbor_func)
+	local us_time = minetest.get_us_time()
+	local check_vertical = false
+	neighbor_func = neighbor_func or get_neighbors
+
+	local start = self._path_data.start or {
+		x = floor(pos1.x + 0.5),
+		y = floor(pos1.y + 0.5),
+		z = floor(pos1.z + 0.5)
+	}
+	local goal = {
+		x = floor(pos2.x + 0.5),
+		y = floor(pos2.y + 0.5),
+		z = floor(pos2.z + 0.5)
+	}
+
+	self._path_data.start = start
+
+	if goal.x == start.x
+	and goal.z == start.z then -- No path can be found
+		self._path_data = {}
+		return
+	end
+
+	local openSet = self._path_data.open or {}
+	local closedSet = self._path_data.closed or {}
+
+	local start_index = minetest.hash_node_position(start)
+
+	openSet[start_index] = {
+		pos = start,
+		parent = nil,
+		gScore = 0,
+		fScore = get_distance(start, goal)
+	}
+
+	local count = self._path_data.count or 1
+	local current_id, current
+	local adjacent
+	local neighbor
+
+	local temp_gScore
+	local new_gScore
+	local hCost
+
+	local hashed_pos
+	local parent_open
+	local parent_closed
+
+	while count > 0 do
+
+		-- Initialize ID and data
+		current_id, current = next(openSet)
+
+		-- Find lowest f cost
+		for i, v in pairs(openSet) do
+			if v.fScore < current.fScore then
+				current_id = i
+				current = v
+			end
+		end
+
+		if not current_id then self._path_data = {} return end -- failsafe
+
+		-- Add lowest fScore to closedSet and remove from openSet
+		openSet[current_id] = nil
+		closedSet[current_id] = current
+
+		if ((check_vertical or is_on_ground(goal))
+		and current_id == minetest.hash_node_position(goal))
+		or ((not check_vertical and not is_on_ground(goal))
+		and goal.x == current.pos.x
+		and goal.z == current.pos.z) then
+			local path = {}
+			local fail_safe = 0
+
+			for _ in pairs(closedSet) do
+				fail_safe = fail_safe + 1
+			end
+
+			repeat
+				if not closedSet[current_id] then self._path_data = {} return end
+				table.insert(path, closedSet[current_id].pos)
+				current_id = closedSet[current_id].parent
+			until current_id == start_index or #path >= fail_safe
+
+			if not closedSet[current_id] then self._path_data = {} return nil end
+
+			table.insert(path, closedSet[current_id].pos)
+
+			local reverse_path = {}
+			repeat table.insert(reverse_path, table.remove(path)) until #path == 0
+
+			self._path_data = {}
+			return reverse_path
+		end
+
+		parent_open = openSet[current.parent]
+		parent_closed = closedSet[current.parent]
+		adjacent, check_vertical = neighbor_func(
+			current.pos,
+			self.width,
+			self.height,
+			openSet,
+			closedSet,
+			(parent_closed and parent_closed.pos) or (parent_open and parent_open.pos)
+		)
+		-- Fly, Swim, and Climb all return true for check_vertical to properly check if goal has been reached
+
+		-- Go through neighboring nodes
+		for i = 1, #adjacent do
+			neighbor = {
+				pos = adjacent[i],
+				parent = current_id,
+				gScore = 0,
+				fScore = 0
+			}
+
+			temp_gScore = current.gScore + get_distance_to_neighbor(current.pos, neighbor.pos)
+			new_gScore = 0
+
+			hashed_pos = minetest.hash_node_position(neighbor.pos)
+
+			if openSet[hashed_pos] then
+				new_gScore = openSet[hashed_pos].gScore
+			end
+
+			if (temp_gScore < new_gScore
+			or not openSet[hashed_pos])
+			and not closedSet[hashed_pos] then
+				if not openSet[hashed_pos] then
+					count = count + 1
+				end
+
+				hCost = get_distance_to_neighbor(neighbor.pos, goal)
+
+				neighbor.gScore = temp_gScore
+				neighbor.fScore = temp_gScore + hCost
+				openSet[hashed_pos] = neighbor
+			end
+		end
+
+		if minetest.get_us_time() - us_time > a_star_alloted_time then
+			self._path_data = {
+				start = start,
+				open = openSet,
+				closed = closedSet,
+				count = count
+			}
+			return
+		end
+
+		if count > (max_open or 100) then
+			self._path_data = {}
+			return
+		end
+	end
+end
+
+-- Theta*
+
+function creatura.pathfinder.find_path_theta(self, pos1, pos2, neighbor_func)
+	local us_time = minetest.get_us_time()
+	local check_vertical = false
+	neighbor_func = neighbor_func or get_neighbors
+
+	local start = self._path_data.start or {
+		x = floor(pos1.x + 0.5),
+		y = floor(pos1.y + 0.5),
+		z = floor(pos1.z + 0.5)
+	}
+	local goal = {
+		x = floor(pos2.x + 0.5),
+		y = floor(pos2.y + 0.5),
+		z = floor(pos2.z + 0.5)
+	}
+
+	self._path_data.start = start
+
+	if goal.x == start.x
+	and goal.z == start.z then -- No path can be found
+		return
+	end
+
+	local openSet = self._path_data.open or {}
+	local closedSet = self._path_data.closed or {}
+
+	local start_index = minetest.hash_node_position(start)
+
+	openSet[start_index] = {
+		pos = start,
+		parent = nil,
+		gScore = 0,
+		fScore = get_distance(start, goal)
+	}
+
+	local count = self._path_data.count or 1
+	local current_id, current
+	local current_parent
+	local adjacent
+	local neighbor
+
+	local temp_gScore
+	local new_gScore
+	local hCost
+
+	local hashed_pos
+	local parent_open
+	local parent_closed
+
+	while count > 0 do
+
+		-- Initialize ID and data
+		current_id, current = next(openSet)
+
+		-- Find lowest f cost
+		for i, v in pairs(openSet) do
+			if v.fScore < current.fScore then
+				current_id = i
+				current = v
+			end
+		end
+
+		if not current_id then return end -- failsafe
+
+		-- Add lowest fScore to closedSet and remove from openSet
+		openSet[current_id] = nil
+		closedSet[current_id] = current
+
+		if ((check_vertical or is_on_ground(goal))
+		and current_id == minetest.hash_node_position(goal))
+		or ((not check_vertical and not is_on_ground(goal))
+		and goal.x == current.pos.x
+		and goal.z == current.pos.z) then
+			local path = {}
+			local fail_safe = 0
+
+			for _ in pairs(closedSet) do
+				fail_safe = fail_safe + 1
+			end
+
+			repeat
+				if not closedSet[current_id] then return end
+				table.insert(path, closedSet[current_id].pos)
+				current_id = closedSet[current_id].parent
+			until current_id == start_index or #path >= fail_safe
+
+			if not closedSet[current_id] then self._path_data = {} return nil end
+
+			table.insert(path, closedSet[current_id].pos)
+
+			local reverse_path = {}
+			repeat table.insert(reverse_path, table.remove(path)) until #path == 0
+
+			self._path_data = {}
+			return reverse_path
+		end
+
+		parent_open = openSet[current.parent]
+		parent_closed = closedSet[current.parent]
+		adjacent, check_vertical = neighbor_func(
+			current.pos,
+			self.width,
+			self.height,
+			openSet,
+			closedSet,
+			(parent_closed and parent_closed.pos) or (parent_open and parent_open.pos)
+		)
+		-- Fly, Swim, and Climb all return true for check_vertical to properly check if goal has been reached
+
+		-- Go through neighboring nodes
+		for i = 1, #adjacent do
+			neighbor = {
+				pos = adjacent[i],
+				parent = current_id,
+				gScore = 0,
+				fScore = 0
+			}
+
+			hashed_pos = minetest.hash_node_position(neighbor.pos)
+
+			if not openSet[hashed_pos]
+			and not closedSet[hashed_pos] then
+				current_parent = closedSet[current.parent] or closedSet[start_index]
+				if not current_parent then
+					current_parent = openSet[current.parent] or openSet[start_index]
+				end
+
+				if current_parent
+				and get_line_of_sight(current_parent.pos, neighbor.pos) then
+					temp_gScore = current_parent.gScore + get_distance_to_neighbor(current_parent.pos, neighbor.pos)
+					new_gScore = 999
+
+					if openSet[hashed_pos] then
+						new_gScore = openSet[hashed_pos].gScore
+					end
+
+					if temp_gScore < new_gScore then
+						hCost = get_distance_to_neighbor(neighbor.pos, goal)
+						neighbor.gScore = temp_gScore
+						neighbor.fScore = temp_gScore + hCost
+						neighbor.parent = minetest.hash_node_position(current_parent.pos)
+						openSet[hashed_pos] = neighbor
+						count = count + 1
+					end
+				else
+					temp_gScore = current.gScore + get_distance_to_neighbor(current_parent.pos, neighbor.pos)
+					new_gScore = 999
+
+					if openSet[hashed_pos] then
+						new_gScore = openSet[hashed_pos].gScore
+					end
+
+					if temp_gScore < new_gScore then
+						hCost = get_distance_to_neighbor(neighbor.pos, goal)
+						neighbor.gScore = temp_gScore
+						neighbor.fScore = temp_gScore + hCost
+
+						openSet[hashed_pos] = neighbor
+						count = count + 1
+					end
+				end
+			end
+		end
+
+		if minetest.get_us_time() - us_time > theta_star_alloted_time then
+			self._path_data = {
+				start = start,
+				open = openSet,
+				closed = closedSet,
+				count = count
+			}
+			return
+		end
+
+		if count > (max_open or 100) then
+			self._path_data = {}
+			return
+		end
+	end
+end

spawning.lua

@@ -87,6 +87,19 @@ function creatura.register_spawn_item(name, def)
 	def.description = def.description or "Spawn " .. format_name(name)
 	def.inventory_image = def.inventory_image or inventory_image
 	def.on_place = function(itemstack, player, pointed_thing)
+		-- If the player right-clicks something like a chest or item frame then
+		-- run the node's on_rightclick callback
+		local under = pointed_thing.under
+		local node = minetest.get_node(under)
+		local node_def = minetest.registered_nodes[node.name]
+		if node_def and node_def.on_rightclick and
+				not (player and player:is_player() and
+				player:get_player_control().sneak) then
+			return node_def.on_rightclick(under, node, player, itemstack,
+				pointed_thing) or itemstack
+		end
+
+		-- Otherwise spawn the mob
 		local pos = minetest.get_pointed_thing_position(pointed_thing, true)
 		if minetest.is_protected(pos, player and player:get_player_name() or "") then return end
 		local mobdef = minetest.registered_entities[name]
@@ -518,8 +531,11 @@ local function can_spawn(pos, width, height)
 	return true
 end
 
+local mobs_spawn = minetest.settings:get_bool("mobs_spawn") ~= false
+
 function creatura.register_abm_spawn(mob, def)
 	local chance = def.chance or 3000
+	local chance_on_load = def.chance_on_load or def.chance / 32
 	local interval = def.interval or 30
 	local min_height = def.min_height or 0
 	local max_height = def.max_height or 128
@@ -534,10 +550,15 @@ function creatura.register_abm_spawn(mob, def)
 	local nodes = def.nodes or {"group:soil", "group:stone"}
 	local neighbors = def.neighbors or {"air"}
 	local spawn_on_load = def.spawn_on_load or false
+	local spawn_active = def.spawn_active or true
 	local spawn_in_nodes = def.spawn_in_nodes or false
 	local spawn_cap = def.spawn_cap or 5
 
-	local function spawn_func(pos, _, _, aocw)
+	local function spawn_func(pos, aocw, is_lbm)
+
+		if not mobs_spawn then
+			return
+		end
 
 		if not spawn_in_nodes then
 			pos.y = pos.y + 1
@@ -549,8 +570,8 @@ function creatura.register_abm_spawn(mob, def)
 			return
 		end
 
-		if spawn_on_load  then -- Manual checks for LBMs
-			if random(chance) > 1 then return end
+		if is_lbm then -- Manual checks for LBMs
+			if random(chance_on_load or chance) > 1 then return end
 			if not minetest.find_node_near(pos, 1, neighbors) then return end
 			if pos.y > max_height or pos.y < min_height then return end
 		end
@@ -674,11 +695,12 @@ function creatura.register_abm_spawn(mob, def)
 			label = mob .. " spawning",
 			nodenames = nodes,
 			run_at_every_load = false,
-			action = function(pos, ...)
-				spawn_func(pos, ...)
+			action = function(pos, _, _, aocw)
+				spawn_func(pos, aocw, true)
 			end
 		})
-	else
+	end
+	if spawn_active then
 		minetest.register_abm({
 			label = mob .. " spawning",
 			nodenames = nodes,
@@ -688,8 +710,8 @@ function creatura.register_abm_spawn(mob, def)
 			min_y = min_height,
 			max_y = max_height,
 			catch_up = false,
-			action = function(pos, ...)
-				spawn_func(pos, ...)
+			action = function(pos, _, _, aocw)
+				spawn_func(pos, aocw, false)
 			end
 		})
 	end