added smoke by damage

lib_planes/entities.lua

@@ -274,6 +274,28 @@ function airutils.logic(self)
         airutils.landing_lights_operate(self)
     end
 
+    --smoke and fire
+    if self._engine_running then
+        local curr_health_percent = (self.hp_max * 100)/self._max_plane_hp
+        if curr_health_percent < 20 then
+            airutils.add_smoke_trail(self, 2)
+        elseif curr_health_percent < 50 then
+            airutils.add_smoke_trail(self, 1)
+        end
+    else
+        if self._smoke_spawner and not self._smoke_semaphore then
+            self._smoke_semaphore = 1 --to set it only one time
+            minetest.after(5, function()
+                if self._smoke_spawner then
+                    minetest.delete_particlespawner(self._smoke_spawner)
+                    self._smoke_spawner = nil
+                    self._smoke_semaphore = nil
+                end
+            end)
+        end
+    end
+
+
     if longit_speed == 0 and is_flying == false and is_attached == false and self._engine_running == false then
         return
     end
@@ -477,8 +499,6 @@ function airutils.logic(self)
         end
     end
 
-
-
     ------------------------------------------------------
     -- end accell
     ------------------------------------------------------
@@ -487,6 +507,7 @@ function airutils.logic(self)
     -- sound and animation
     ------------------------------------------------------
     airutils.engine_set_sound_and_animation(self)
+
     ------------------------------------------------------
 
     --self.object:get_luaentity() --hack way to fix jitter on climb

lib_planes/utilities.lua

@@ -689,6 +689,42 @@ function airutils.pid_controller(current_value, setpoint, last_error, d_time, kp
     return output, last_error
 end
 
+function airutils.add_smoke_trail(self, smoke_type)
+    smoke_type = smoke_type or 1
+    local smoke_texture = "airutils_smoke.png"
+    if smoke_type == 2 then
+        smoke_texture = "airutils_smoke.png^[multiply:#020202"
+    end
+
+    if self._curr_smoke_type ~= smoke_type then
+        self._curr_smoke_type = smoke_type
+        if self._smoke_spawner then
+            minetest.delete_particlespawner(self._smoke_spawner)
+            self._smoke_spawner = nil
+        end
+    end
+
+    if self._smoke_spawner == nil then
+        local radius = 1
+	    self._smoke_spawner = minetest.add_particlespawner({
+		    amount = 3,
+		    time = 0,
+		    --minpos = vector.subtract(pos, radius / 2),
+		    --maxpos = vector.add(pos, radius / 2),
+		    minvel = {x = -1, y = -1, z = -1},
+		    maxvel = {x = 1, y = 5, z = 1},
+		    minacc = vector.new(),
+		    maxacc = vector.new(),
+            attached = self.object,
+		    minexptime = 3,
+		    maxexptime = 5.5,
+		    minsize = 10,
+		    maxsize = 15,
+		    texture = smoke_texture,
+	    })
+    end
+end
+
 function airutils.add_destruction_effects(pos, radius, w_fire)
     if pos == nil then return end
     w_fire = w_fire
@@ -801,8 +837,15 @@ function airutils.start_engine(self)
         self._power_lever = 0 --zero power
         self._last_applied_power = 0 --zero engine
     elseif self._engine_running == false and self._energy > 0 then
-	    self._engine_running = true
-        self._last_applied_power = -1 --send signal to start
+        local curr_health_percent = (self.hp_max * 100)/self._max_plane_hp
+        if curr_health_percent > 20 then
+	        self._engine_running = true
+            self._last_applied_power = -1 --send signal to start
+        else
+            if self.driver_name then
+                minetest.chat_send_player(self.driver_name,core.colorize('#ff0000', " >>> The engine is damaged, start procedure failed."))
+            end
+        end
     end
 end