fix delay=0 in combat code, tune turning parameters

mods/ENTITIES/mcl_mobs/combat.lua

@@ -12,15 +12,7 @@ local enable_pathfinding = true
 
 local TIME_TO_FORGET_TARGET = 15
 
-local atann = math.atan
+local atan2 = math.atan2
-local function atan(x)
-	if not x or x ~= x then
-		return 0
-	else
-		return atann(x)
-	end
-end
-
 
 -- check if daytime and also if mob is docile during daylight hours
 function mob_class:day_docile()
@@ -925,10 +917,8 @@ function mob_class:do_states_attack (dtime)
 	if self.attack_type == "explode" then
 
 		if target_line_of_sight then
-			local vec = { x = p.x - s.x, z = p.z - s.z }
+			yaw = -atan2(p.x - s.x, p.z - s.z) - self.rotate
-			yaw = (atan(vec.z / vec.x) +math.pi/ 2) - self.rotate
+			yaw = self:set_yaw(yaw, 1, dtime)
-			if p.x > s.x then yaw = yaw +math.pi end
-			yaw = self:set_yaw( yaw, 0, dtime)
 		end
 
 		local node_break_radius = self.explosion_radius or 1
@@ -1081,16 +1071,8 @@ function mob_class:do_states_attack (dtime)
 			p = {x = p1.x, y = p1.y, z = p1.z}
 		end
 
-		local vec = {
+		yaw = -atan2(p.x - s.x, p.z - s.z) - self.rotate
-			x = p.x - s.x,
+		yaw = self:set_yaw(yaw, 1, dtime)
-			z = p.z - s.z
-		}
-
-		yaw = (atan(vec.z / vec.x) + math.pi / 2) - self.rotate
-
-		if p.x > s.x then yaw = yaw + math.pi end
-
-		yaw = self:set_yaw( yaw, 0, dtime)
 
 		-- move towards enemy if beyond mob reach
 		if dist > self.reach then
@@ -1171,18 +1153,14 @@ function mob_class:do_states_attack (dtime)
 		p.y = p.y - .5
 		s.y = s.y + .5
 
-		local dist = vector.distance(p, s)
 		local vec = {
 			x = p.x - s.x,
 			y = p.y - s.y,
 			z = p.z - s.z
 		}
-
+		local dist = (vec.x^2 + vec.y^2 + vec.z^2)^0.5
-		yaw = (atan(vec.z / vec.x) +math.pi/ 2) - self.rotate
+		yaw = -atan2(vec.x, vec.z) - self.rotate
-
+		yaw = self:set_yaw(yaw, 1, dtime)
-		if p.x > s.x then yaw = yaw +math.pi end
-
-		yaw = self:set_yaw( yaw, 0, dtime)
 
 		local stay_away_from_player = vector.zero()
 
@@ -1252,12 +1230,11 @@ function mob_class:do_states_attack (dtime)
 					end
 				end
 
-				local amount = (vec.x * vec.x + vec.y * vec.y + vec.z * vec.z) ^ 0.5
 				-- offset makes shoot aim accurate
 				vec.y = vec.y + self.shoot_offset
-				vec.x = vec.x * (v / amount)
+				vec.x = vec.x * (v / dist)
-				vec.y = vec.y * (v / amount)
+				vec.y = vec.y * (v / dist)
-				vec.z = vec.z * (v / amount)
+				vec.z = vec.z * (v / dist)
 				if self.shoot_arrow then
 					vec = vector.normalize(vec)
 					self:shoot_arrow(p, vec)

mods/ENTITIES/mcl_mobs/movement.lua

@@ -354,7 +354,7 @@ function mob_class:env_danger_movement_checks(player_in_active_range)
 				self:set_animation("stand")
 			end
 			local yaw = self.object:get_yaw() or 0
-			self:set_yaw(yaw + PIHALF * (random() - 0.5), 6)
+			self:set_yaw(yaw + PIHALF * (random() - 0.5), 10)
 			return
 		end
 	end
@@ -367,7 +367,7 @@ function mob_class:env_danger_movement_checks(player_in_active_range)
 				self:set_animation("stand")
 			end
 			local yaw = self.object:get_yaw() or 0
-			yaw = self:set_yaw(yaw + PIHALF * (random() - 0.5), 6)
+			yaw = self:set_yaw(yaw + PI * (random() - 0.5), 10)
 		end
 	end
 end
@@ -473,7 +473,7 @@ function mob_class:do_jump()
 			self.jump_count = (self.jump_count or 0) + 1
 			if self.jump_count == 4 then
 				local yaw = self.object:get_yaw() or 0
-				yaw = self:set_yaw(yaw + PIHALF * (random() - 0.5), 8)
+				yaw = self:set_yaw(yaw + PI * (random() - 0.5), 8)
 				self.jump_count = 0
 			end
 		end
@@ -924,7 +924,7 @@ function mob_class:do_states_walk()
 		if logging then
 			minetest.log("action", "[mcl_mobs] "..self.name.." facing a wall, turning.")
 		end
-		yaw = self:set_yaw(yaw + PIHALF * (random() - 0.5), 6)
+		yaw = self:set_yaw(yaw + PI * (random() - 0.5), 6)
 	-- otherwise randomly turn
 	elseif random() <= 0.3 then
 		yaw = self:set_yaw(yaw + PIHALF * (random() - 0.5), 10)
@@ -973,8 +973,8 @@ function mob_class:do_states_stand(player_in_active_range)
 					and self.facing_fence ~= true
 					and random(1, 100) <= self.walk_chance then
 				if self:is_at_cliff_or_danger() then
-					yaw = yaw + PIHALF * (random() - 0.5)
+					yaw = yaw + PI * (random() - 0.5)
-					yaw = self:set_yaw(yaw, 8)
+					yaw = self:set_yaw(yaw, 10)
 				else
 					self:set_velocity(self.walk_velocity)
 					self.state = "walk"
@@ -997,7 +997,7 @@ function mob_class:do_states_runaway()
 		self:set_velocity(0)
 		self.state = "stand"
 		self:set_animation("stand")
-		yaw = self:set_yaw(yaw + PI * (random() - 0.5), 8)
+		yaw = self:set_yaw(yaw + PI * (random() + 0.5), 8)
 	else
 		self:set_velocity( self.run_velocity)
 		self:set_animation( "run")

mods/ENTITIES/mcl_mobs/physics.lua

@@ -283,17 +283,16 @@ function mob_class:check_smooth_rotation(dtime)
 	end
 
 	local delay = self.delay
-	if delay and delay > 0 then
 	local yaw = self.object:get_yaw() or 0
 	local target_yaw = self.target_yaw
-		if delay == 1 then
+	if delay and delay > 1 then
-			yaw = target_yaw
-		else
 		local dif = (target_yaw - yaw + PI) % TWOPI - PI
 		yaw = (yaw + dif / delay) % TWOPI
+		self.delay = delay - 1
+	else
+		yaw = target_yaw
 	end
 
-		self.delay = delay - 1
 	if self.shaking then
 		yaw = yaw + (random() * 2 - 1) / 72 * dtime
 	end
@@ -304,7 +303,6 @@ function mob_class:check_smooth_rotation(dtime)
 	--end
 	--self:update_roll()
 end
-end
 
 -- global function to set mob yaw
 function mcl_mobs.yaw(self, yaw, delay, dtime)