balloon can't be used for spelunking any more - added collisions, stop sounds when break

init.lua

@@ -353,6 +353,18 @@ function boat.on_death(self, killer)
 	end
 	self._driver = nil
 	self._passenger = nil
+
+-- stop sounds
+	if self._sounds then
+		if self._sounds.engine
+		and self._sounds.engine.handle then
+			boat.sound_stop(self._sounds.engine)
+		end
+		if self._sounds.engine_stop
+		and self._sounds.engine_stop.handle then
+			boat.sound_stop(self._sounds.engine_stop)
+		end
+	end
 end
 
 function boat.on_punch(self, puncher, time_from_last_punch, tool_capabilities, dir, damage)
@@ -369,6 +381,65 @@ function boat.sound_countdown(self, dtime)
 	end
 end
 
+
+-- 10, 5, 5
+-- this system ensures collision kind of works with balloons.
+-- does not include entity to entity collisions
+local balloon = {}
+balloon.offset = 6
+balloon.length = 3.5
+balloon.height = 2.5
+local balloon_nodes = {}
+balloon_nodes[0] = { -- top
+	p = vector.new(0, balloon.offset + balloon.height, 0),
+	dir = vector.new(0, -5, 0),}
+balloon_nodes[1] = { -- front
+	p = vector.new(0, balloon.offset, balloon.length),
+	dir = vector.new(0, -0.5, -1),}
+balloon_nodes[2] = { -- back
+	p = vector.new(0, balloon.offset, -balloon.length),
+	dir = vector.new(0, 0, 1),}
+balloon_nodes[3] = { -- left or right
+	p = vector.new(balloon.length, balloon.offset, 0),
+	dir = vector.new(-1, 0, 0),}
+balloon_nodes[4] = { -- left or right
+	p = vector.new(-balloon.length, balloon.offset, 0),
+	dir = vector.new(1, 0, 0),}
+-- diagonals
+local vdiag = 0.7
+balloon_nodes[5] = {
+	p = vector.new(-balloon.length*vdiag, balloon.offset, -balloon.length*vdiag),
+	dir = vector.new(vdiag, 0, vdiag),}
+balloon_nodes[6] = {
+	p = vector.new(balloon.length*vdiag, balloon.offset, -balloon.length*vdiag),
+	dir = vector.new(-vdiag, 0, vdiag),}
+balloon_nodes[7] = {
+	p = vector.new(-balloon.length*vdiag, balloon.offset, balloon.length*vdiag),
+	dir = vector.new(vdiag, 0, -vdiag),}
+balloon_nodes[8] = {
+	p = vector.new(balloon.length*vdiag, balloon.offset, balloon.length*vdiag),
+	dir = vector.new(-vdiag, 0, -vdiag),}
+
+function boat.get_balloon_collide(self)
+	local force = vector.new()
+	local o = self.object:get_pos()
+	for _, check in pairs(balloon_nodes) do
+		local n = minetest.get_node(vector.add(check.p, o))
+		-- minetest.add_particle({
+		-- 	pos = vector.add(o, check.p),
+		-- 	velocity = vector.new(0, 1, 0),
+		-- 	expirationtime = math.random(0.5, 2),
+		-- 	size = math.random(0.1, 4),
+		-- 	texture = "sum_airship_smoke.png",
+		-- })
+		if n and minetest.registered_nodes[n.name]
+		and minetest.registered_nodes[n.name].walkable then
+			force = vector.add(force, check.dir)
+		end
+	end
+	return force
+end
+
 function boat.on_step(self, dtime, moveresult)
 	boat.sound_countdown(self, dtime)
 	if minetest.get_modpath("mcl_burning") then
@@ -525,13 +596,24 @@ function boat.on_step(self, dtime, moveresult)
 	if forward == 0 then
 		slowdown = 0.97
 	end
-  v.x = v.x * slowdown
+
-  v.z = v.z * slowdown
+	if self._driver then
-	v.y = v.y * 0.97
+		local collide_force = boat.get_balloon_collide(self)
+		-- collide_force = vector.normalize(collide_force)
+		if collide_force ~= vector.new() then
+			collide_force = vector.multiply(collide_force, 0.1)
+			v = vector.multiply(v, 0.95)
+		end
+		v = vector.add(v, collide_force)
+	end
+
 	if is_on_floor and not self._driver then
 		vel = vector.new(0, 0, 0)
 		self.object:set_velocity(vel)
 	else
+		v.x = v.x * slowdown
+	  v.z = v.z * slowdown
+		v.y = v.y * 0.97
 	  self.object:set_velocity(v)
 	end