tweak collision, falling and arrow drops.

api.lua

@@ -276,15 +276,13 @@ function mob_class:collision()
 	local width = -prop.collisionbox[1] + prop.collisionbox[4] + 0.5
 	local pos2, vec, force
 
-	for _,player in pairs(minetest.get_connected_players()) do
+	for _,object in pairs(minetest.get_objects_inside_radius(pos, width)) do
 
-		pos2 = player:get_pos()
+		if object:is_player() then
-
-		if get_distance(pos2, pos) < width then
 
+			pos2 = object:get_pos()
 			vec  = {x = pos.x - pos2.x, z = pos.z - pos2.z}
-
+			force = width - vector.distance(
-			force = (width + 0.5) - vector.distance(
 					{x = pos.x, y = 0, z = pos.z}, {x = pos2.x, y = 0, z = pos2.z})
 
 			x = x + (vec.x * force)
@@ -583,14 +581,7 @@ local function effect(
 
 	radius = radius or 2
 	gravity = gravity or -10
-
+	fall = fall == true and 0 or fall == false and radius or -radius
-	if fall == true then
-		fall = 0
-	elseif fall == false then
-		fall = radius
-	else
-		fall = -radius
-	end
 
 	minetest.add_particlespawner({
 		amount = amount,
@@ -976,7 +967,7 @@ function mob_class:is_at_cliff()
 	return (not def and def.walkable)
 end
 
--- check for nodes or groups inside mob
+-- check for nodes or groups inside mob collision area
 
 function mob_class:is_inside(itemtable)
 
@@ -2581,11 +2572,18 @@ function mob_class:falling(pos)
 		-- fall damage onto solid ground
 		if self.fall_damage and self.object:get_velocity().y == 0 then
 
-			local d = (self.old_y or 0) - self.object:get_pos().y
+			local d = (self.old_y or self.object:get_pos().y) - self.object:get_pos().y
 
 			if d > 5 then
 
-				self.health = self.health - floor(d - 5)
+				local add = minetest.get_item_group(self.standing_on, "fall_damage_add_percent")
+				local damage = d - 5
+
+				if add ~= 0 then
+					damage = damage + damage * (add / 100)
+				end
+
+				self.health = self.health - floor(damage)
 
 				effect(pos, 5, "tnt_smoke.png", 1, 2, 2, nil)
 
@@ -4003,7 +4001,7 @@ function mobs:register_arrow(name, def)
 		hit_node = def.hit_node,
 		hit_mob = def.hit_mob,
 		hit_object = def.hit_object,
-		drop = def.drop or false, -- drops arrow as registered item when true
+		drop = def.drop, -- chance of dropping arrow as registered item
 		timer = 0,
 		lifetime = def.lifetime or 4.5,
 		owner_id = def.owner_id,
@@ -4120,7 +4118,8 @@ function mobs:register_arrow(name, def)
 
 						self:hit_node(pos, node)
 
-						if self.drop == true then
+						if (type(self.drop) == "boolean" and self.drop == true)
+						or (type(self.drop) == "number" and random(self.drop) == 1) then
 
 							pos.y = pos.y + 1
 

api.txt

@@ -560,7 +560,9 @@ This function registers a arrow for mobs with the attack type shoot.
        'textures'     same is in minetest.register_entity()
        'collide_with_objects'       same as above
        'velocity'     the velocity of the arrow
-       'drop'         if set to true any arrows hitting a node will drop as item
+       'drop'         if set to true any arrows hitting a node will drop as item,
+                      if number given then chance (1/num) of item dropping will
+                      be used.  arrow "mymob:myarrow" will use item of same name.
        'hit_player'   a function that is called when the arrow hits a player;
                       this function should hurt the player, the parameters are
                       (self, player)