trans am now have a rudimentary automatic transmission emulation

automobiles_lib/init.lua

@@ -446,6 +446,13 @@ function automobiles_lib.paint_with_mask(self, colstr, mask_colstr, target_textu
     end
 end
 
+-- very basic transmission emulation for the car
+function automobiles_lib.get_transmission_state(curr_speed, max_speed)
+    local retVal = 1
+    if curr_speed >= (max_speed/4) then retVal = 2 end
+    return retVal
+end
+
 dofile(minetest.get_modpath("automobiles_lib") .. DIR_DELIM .. "physics_lib.lua")
 dofile(minetest.get_modpath("automobiles_lib") .. DIR_DELIM .. "custom_physics.lua")
 dofile(minetest.get_modpath("automobiles_lib") .. DIR_DELIM .. "control.lua")

automobiles_trans_am/entities.lua

@@ -304,7 +304,8 @@ minetest.register_entity("automobiles_trans_am:trans_am", {
     _change_color = automobiles_lib.paint,
     _intensity = 4,
     _car_gravity = -automobiles_lib.gravity,
-    _is_flying = 0,
+    --acc control
+    _transmission_state = 1,
 
     get_staticdata = function(self) -- unloaded/unloads ... is now saved
         return minetest.serialize({
@@ -582,7 +583,20 @@ minetest.register_entity("automobiles_trans_am:trans_am", {
                 local mid_speed = (steering_speed/2)
                 steering_speed = mid_speed + mid_speed / math.abs(longit_speed*0.25)
             end
-			accel, stop = automobiles_lib.control(self, dtime, hull_direction, longit_speed, longit_drag, later_drag, accel, trans_am.max_acc_factor, trans_am.max_speed, steering_angle_max, steering_speed)
+
+            --adjust engine parameter (transmission emulation)
+            local acc_factor = trans_am.max_acc_factor
+            local transmission_state = automobiles_lib.get_transmission_state(longit_speed, trans_am.max_speed)
+
+            local target_acc_factor = acc_factor
+            if transmission_state == 1 then
+                target_acc_factor = trans_am.max_acc_factor/2
+            end
+            self._transmission_state = transmission_state
+            --minetest.chat_send_all(transmission_state)
+
+            --control
+			accel, stop = automobiles_lib.control(self, dtime, hull_direction, longit_speed, longit_drag, later_drag, accel, target_acc_factor, trans_am.max_speed, steering_angle_max, steering_speed)
         else
             self._show_lights = false
             if self.sound_handle ~= nil then

automobiles_trans_am/init.lua

@@ -10,7 +10,7 @@ trans_am.max_acc_factor = 12
 trans_am.max_fuel = 10
 trans_am.trunk_slots = 12
 trans_am.ideal_step = 0.2
-trans_am.engine_sound = "automobiles_engine"
+trans_am.engine_sound = "trans_am_engine"
 
 trans_am_GAUGE_FUEL_POSITION =  {x=-4,y=6.8,z=16.6}
 

automobiles_trans_am/utilities.lua

@@ -1,5 +1,3 @@
-
-
 -- destroy the trans_am
 function trans_am.destroy(self, puncher)
     automobiles_lib.remove_light(self)
@@ -65,10 +63,15 @@ function trans_am.engineSoundPlay(self)
     --sound
     if self.sound_handle then minetest.sound_stop(self.sound_handle) end
     if self.object then
+        local snd_pitch = 1 + ((self._longit_speed/10)/2)
+        if self._transmission_state == 1 then
+            snd_pitch = 1 + (self._longit_speed/10)
+        end
+
         self.sound_handle = minetest.sound_play({name = trans_am.engine_sound},
-            {object = self.object, gain = 2,
+            {object = self.object, gain = 4,
-                pitch = 1 + ((self._longit_speed/10)/2),
+                pitch = snd_pitch,
-                max_hear_distance = 10,
+                max_hear_distance = 15,
                 loop = true,})
     end
 end