add "all" to immune_to table, optimized floating code

mods/ENTITIES/mcl_mobs/api.txt

@@ -139,6 +139,7 @@ functions needed for the mob to work properly which contains the following:
 	{"default:sword_wood",0} -- causes no damage.
 	{"default:gold_lump", -10} -- heals by 10 health points.
 	{"default:coal_block", 20} -- 20 damage when hit on head with coal blocks.
+	{"all"} -- stops all weapons causing damage apart from those on list.
 
 	'makes_footstep_sound' when true you can hear mobs walking.
 	'sounds'			this is a table with sounds of the mob

mods/ENTITIES/mcl_mobs/combat.lua

@@ -614,6 +614,9 @@ function mob_class:on_punch(hitter, tflp, tool_capabilities, dir)
 
 			damage = self.immune_to[n][2] or 0
 			break
+		-- if "all" then no tool does damage unless it's specified in list
+		elseif self.immune_to[n][1] == "all" then
+			damage = self.immune_to[n][2] or 0
 		end
 	end
 

mods/ENTITIES/mcl_mobs/physics.lua

@@ -387,8 +387,7 @@ end
 -- are we flying in what we are suppose to? (taikedz)
 function mob_class:flight_check()
 
-	local nod = self.standing_in
-	local def = minetest.registered_nodes[nod]
+	local def = minetest.registered_nodes[self.standing_in]
 
 	if not def then return false end -- nil check
 
@@ -402,7 +401,7 @@ function mob_class:flight_check()
 	end
 
 	for _,checknode in pairs(fly_in) do
-		if nod == checknode or nod == "ignore" then
+		if self.standing_in == checknode or self.standing_in == "ignore" then
 			return true
 		end
 	end
@@ -664,16 +663,27 @@ function mob_class:do_env_damage()
 
 	end
 
-	local y_level = self.collisionbox[2]
+	-- get node at foot level every quarter second
+	self.node_timer = (self.node_timer or 0) + dtime
 
-	if self.child then
-		y_level = self.collisionbox[2] * 0.5
+	if self.node_timer > 0.25 then
+
+		self.node_timer = 0
+
+		local y_level = self.collisionbox[2]
+
+		if self.child then
+			y_level = self.collis77ionbox[2] * 0.5
+		end
+
+		-- what is mob standing in?
+		self.standing_in = node_ok({
+			x = pos.x, y = pos.y + y_level + 0.25, z = pos.z}, "air").name
+		-- print ("standing in " .. self.standing_in)
 	end
 
-	-- what is mob standing in?
-	pos.y = pos.y + y_level + 0.25 -- foot level
+	-- check if falling, flying, floating
 	local pos2 = {x=pos.x, y=pos.y-1, z=pos.z}
-	self.standing_in = node_ok(pos, "air").name
 	self.standing_on = node_ok(pos2, "air").name
 
 	local pos3 = vector.offset(pos, 0, 1, 0)
@@ -937,7 +947,7 @@ function mob_class:falling(pos)
 
 	local acc = self.object:get_acceleration()
 
-	local registered_node = minetest.registered_nodes[node_ok(pos).name]
+	local registered_node = minetest.registered_nodes[self.standing_in]
 
 	if registered_node.groups.lava then
 		if acc and self.floats_on_lava == 1 then
@@ -948,7 +958,7 @@ function mob_class:falling(pos)
 	-- in water then float up
 	if registered_node.groups.water then
 		if acc and self.floats == 1 and minetest.registered_nodes[node_ok(vector.offset(pos,0,self.collisionbox[5] -0.25,0)).name].groups.water then
-			self.object:set_acceleration(vector.new(0, -self.fall_speed / (math.max(1, v.y) ^ 2), 0))
+			self.object:set_acceleration(vector.new(0, -self.fall_speed / (math.max(1, v.y) ^ 8), 0))
 		end
 	else
 		-- fall damage onto solid ground

mods/ENTITIES/mcl_mobs/readme.MD

@@ -20,6 +20,7 @@ mcl_mobs_mob_poof.ogg:
 ------------
 
 Changelog from original Mobs Redo mod:
+- 1.42- Added "all" option to immune_to table, tidied floating mobs to be less intensive
 - 1.41- Mob pathfinding has been updated thanks to Elkien3
 - 1.40- Updated to use newer functions, requires Minetest 0.4.16+ to work.
 - 1.39- Added 'on_breed', 'on_grown' and 'do_punch' custom functions per mob