Vastly improve the boat with sound, texture, model

The boat has been revised with all-new textures, new exhaust, a better
model with few/no shading errors, animated door and sounds. The model
format had to be changed to b3d as obj does not support animation.

init.lua

@@ -148,16 +148,46 @@ if minetest.get_modpath("advtrains_interlocking") ~= nil then
 	dofile(minetest.get_modpath("linetrack") .. "/interlocking.lua")
 end
 
+local exhaust_particle_spawner_base = {
+	amount = 10,
+	time = 0,
+	minpos = {x=-1, y=2.8, z=-3.4},
+	maxpos = {x=-1, y=2.8, z=-3.4},
+	minvel = {x=-0.2, y=1.8, z=-0.2},
+	maxvel = {x=0.2, y=2, z=0.2},
+	minacc = {x=0, y=-0.1, z=0},
+	maxacc = {x=0, y=-0.3, z=0},
+	minexptime = 1,
+	maxexptime = 3,
+	minsize = 1,
+	maxsize = 4,
+	collisiondetection = true,
+	vertical = false,
+	texture = "smoke_puff.png",
+}
+
 advtrains.register_wagon("boat", {
-	mesh="linetrack_boat.obj",
-	textures = {"linetrack_boat.png"},
+	mesh="linetrack_boat.b3d",
+	textures = {
+		"doors_door_steel.png",--y
+		"linetrack_steel_tile_dark.png", --y(exhaust)
+		"default_coal_block.png",
+		"linetrack_steel_tile_light.png",--y
+		"linetrack_steel_tile_dark.png",
+		"linetrack_steel_tile_blue.png",--y
+		"linetrack_diamond_plate_steel_blue.png",--y
+		"linetrack_steel_tile_dark.png",--y(hull)
+		"default_wood.png", --y
+		"linetrack_lifering.png", --y
+		"linetrack_boat_windows.png",
+	},
 	drives_on={waterline=true},
 	max_speed=10,
 	seats = {
 		{
 			name="Driver stand",
-			attach_offset={x=0, y=2, z=12},
-			view_offset={x=0, y=0, z=0},
+			attach_offset={x=6, y=2, z=10},
+			view_offset={x=6, y=0, z=8},
 			group="dstand",
 		},
 		{
@@ -234,6 +264,18 @@ advtrains.register_wagon("boat", {
 			require_doors_open=true,
 		},
 	},
+	doors={
+		open={
+			[-1]={frames={x=0, y=1}, time=1},
+			[1]={frames={x=0, y=1}, time=1},
+			sound = "doors_steel_door_open",
+		},
+		close={
+			[-1]={frames={x=2, y=3}, time=1},
+			[1]={frames={x=2, y=3}, time=1},
+			sound = "doors_steel_door_close",
+		}
+	},
 	assign_to_seat_group = {"pass", "dstand"},
 	door_entry={-1, 1},
 	visual_size = {x=1, y=1},
@@ -242,8 +284,79 @@ advtrains.register_wagon("boat", {
 	is_locomotive=true,
 	wagon_width=5,
 	drops={"default:steelblock 4"},
-	horn_sound = "advtrains_subway_horn",
-	glow = -1, --supposed to disable effect of light to texture color, so that the entity always appears as full-bright
+	horn_sound = "linetrack_boat_horn",
+	custom_on_destroy = function(self)
+		if (self.sound_loop_handle) then
+			minetest.sound_stop(self.sound_loop_handle) --don't loop forever D:
+		end
+		return true
+	end,
+	custom_on_velocity_change = function(self, velocity, old_velocity, dtime)
+		if not velocity or not old_velocity then return end
+		if old_velocity == 0 and velocity > 0 then
+			self.particlespawners = {
+				minetest.add_particlespawner(advtrains.merge_tables(exhaust_particle_spawner_base,
+					{minpos = {x=1, y=2.8, z=-3.4}, maxpos = {x=1, y=2.9, z=-3.4}, attached = self.object})),
+				minetest.add_particlespawner(advtrains.merge_tables(exhaust_particle_spawner_base,
+					{minpos = {x=-1, y=2.8, z=-3.4}, minpos = {x=-1, y=2.8, z=-3.4}, attached = self.object})),
+			}
+			minetest.sound_play("linetrack_boat_start", {object = self.object})
+			return
+		end
+		if velocity == 0 then
+			if self.sound_loop_handle then
+				minetest.sound_stop(self.sound_loop_handle)
+				self.sound_loop_handle = nil
+			end
+			if self.particlespawners then
+				for k,v in pairs(self.particlespawners) do
+					minetest.delete_particlespawner(v)
+				end
+			end
+			if old_velocity > 0 then
+				minetest.sound_play("linetrack_boat_stop", {object = self.object})
+			end
+			return
+		end
+		if self.rev_tmr then
+			delta = minetest.get_us_time()- self.rev_start
+			if delta >= self.rev_tmr then
+				self.rev_tmr = nil
+				if self.rev_high then
+					self.sound_loop_handle = minetest.sound_play({name="linetrack_boat_idle_high", gain=0.3}, {object = self.object, loop=true})
+				else
+					self.sound_loop_handle = minetest.sound_play({name="linetrack_boat_idle_low", gain=0.3}, {object = self.object, loop=true})
+				end
+			end
+		elseif velocity > 0 then
+			if self.sound_loop_handle == nil then
+				if velocity > 5 then
+				self.sound_loop_handle = minetest.sound_play({name="linetrack_boat_idle_high", gain=0.3}, {object = self.object, loop=true})
+				else 
+					self.sound_loop_handle = minetest.sound_play({name="linetrack_boat_idle_low", gain=0.3}, {object = self.object, loop=true})
+				end
+				return
+			end
+			if velocity ~= old_velocity then
+				if old_velocity < 5 and velocity > 5 then
+					minetest.sound_stop(self.sound_loop_handle)
+					self.sound_loop_handle = nil
+					minetest.sound_play({name="linetrack_boat_revup", gain=0.3}, {object = self.object})
+					self.rev_start = minetest.get_us_time()
+					self.rev_tmr = 2813000
+					self.rev_high = true
+				elseif old_velocity > 5 and velocity < 5 then
+					minetest.sound_stop(self.sound_loop_handle)
+					self.sound_loop_handle = nil
+					minetest.sound_play({name="linetrack_boat_revdown", gain=0.3}, {object = self.object})
+					self.rev_start = minetest.get_us_time()
+					self.rev_tmr = 373000
+					self.rev_high = false
+					
+				end
+			end
+		end
+	end,
 }, "Boat", "linetrack_boat_inv.png")
 
 minetest.register_node("linetrack:invisible_platform", {