arrow entity check, glow and expire added to arrows

api.lua

@@ -1,5 +1,5 @@
 
--- Mobs Api (19th January 2017)
+-- Mobs Api (20th January 2017)
 
 mobs = {}
 mobs.mod = "redo"
@@ -1893,6 +1893,7 @@ local do_states = function(self, dtime)
 				p.y = p.y + (self.collisionbox[2] + self.collisionbox[5]) / 2
 
 				local obj = minetest.add_entity(p, self.arrow)
+				if obj then
 					local ent = obj:get_luaentity()
 					local amount = (vec.x * vec.x + vec.y * vec.y + vec.z * vec.z) ^ 0.5
 					local v = ent.velocity or 1 -- or set to default
@@ -1909,6 +1910,7 @@ local do_states = function(self, dtime)
 				end
 			end
 		end
+	end
 end
 
 
@@ -2886,25 +2888,15 @@ function mobs:register_arrow(name, def)
 			and def.tail == 1
 			and def.tail_texture then
 
---				effect(pos, 1, def.tail_texture,
+				minetest.add_particle({
---					def.tail_size or 5,
+					pos = pos,
---					def.tail_size or 10,
+					velocity = {x = 0, y = 0, z = 0},
---					0, 0) -- 0 radius and 0 gravity to just hover
+					acceleration = {x = 0, y = 0, z = 0},
-
+					expirationtime = def.expire or 0.25,
-				minetest.add_particlespawner({
+					collisiondetection = false,
-					amount = 1,
-					time = 0.25,
-					minpos = pos,
-					maxpos = pos,
-					minvel = {x = 0, y = 0, z = 0},
-					maxvel = {x = 0, y = 0, z = 0},
-					minacc = {x = 0, y = 0, z = 0},
-					maxacc = {x = 0, y = 0, z = 0},
-					minexptime = 0.1,
-					maxexptime = 1,
-					minsize = def.tail_size or 5,
-					maxsize = def.tail_size or 10,
 					texture = def.tail_texture,
+					size = def.tail_size or 5,
+					glow = def.glow or 0,
 				})
 			end
 

api.txt

@@ -194,6 +194,8 @@ This function registers a arrow for mobs with the attack type shoot.
         'tail' when set to 1 adds a trail or tail to mob arrows
         'tail_texture' texture string used for above effect
         'tail_size' has size for above texture (defaults to between 5 and 10)
+        'expire' contains float value for how long tail appears for (defaults to 0.25)
+        'glow' has value for how brightly tail glows 1 to 10 (default is 0, no glow)
     'on_step' is a custom function when arrow is active, nil for default.