A simple mob

[Don]

I need a simple mob for a mini game I am making. I am wondering if it is better to use an existing mob api for this or write a new one.

The mob only needs to chase a player. There is no animation, punch or attack. I don't even want the player to be able to hit the mob.

I know very little about mobs so any advice would be appreciated.

[TenPlus1]

For simplicity you could use the mods redo api but if the mob in question does nothing but follow the player then this code may be simple to implement, it spawns a cube that follows player.

Code: Select all

local gravity = -10

minetest.register_entity("test:testy", {
	hp_max = 1,
	physical = true,
	collide_with_objects = true,
	visual = "cube",
	visual_size = {x = 0.5, y = 0.5},
	textures = {"sides.png", "sides.png", "sides.png", "sides.png", "front.png", "sides.png"},
	velocity = {x=math.random(-1,1), y=0, z=math.random(-1,1)},
	collisionbox = {-0.25, -0.25, -0.25, 0.25, 0.25, 0.25},
	weight = 5, -- ??
	is_visible = true,
	automatic_rotate = true,
	automatic_face_movement_dir = -90, -- set yaw direction in degrees, false to disable
	stepheight = 1.1,
	makes_footstep_sound = true,
	floats = 1,
	view_range = 10,
	speed = 1,
	jump_height = 5,

	set_velocity = function(self, v)
		if not v then v = 0 end
		local yaw = self.object:getyaw()
		self.object:setvelocity({x=math.sin(yaw) * -v, y=self.object:getvelocity().y, z=math.cos(yaw) * v})
	end,

	on_step = function(self, dtime)

		-- every 1 second
		self.timer = (self.timer or 0) + dtime
		if self.timer < 1 then return end
		self.timer = 0

		-- make sure object floats (or not) when in water
		if minetest.get_item_group(minetest.get_node(self.object:getpos()).name, "water") ~= 0 then
			if self.floats == 1 then
				self.object:setacceleration({x = self.object:getacceleration().x, y = 1.5, z = self.object:getacceleration().z})
			end
		else
			self.object:setacceleration({x = self.object:getacceleration().x, y = gravity, z = self.object:getacceleration().z})
		end

		local s, p, dist, nod
		-- find player to follow
		for _,player in pairs(minetest.get_connected_players()) do
			s = self.object:getpos()
			p = player:getpos()

			-- find distance
			dist = ((p.x-s.x)^2 + (p.y-s.y)^2 + (p.z-s.z)^2)^0.5
			if dist < self.view_range then
				local vec = {x=p.x-s.x, y=p.y-s.y, z=p.z-s.z}
				local yaw = (math.atan(vec.z/vec.x)+math.pi/2)
				if p.x > s.x then
					yaw = yaw + math.pi
				end
				-- face player
				self.object:setyaw(yaw)

				-- find direction and show node facing
				self.direction = {x = math.sin(yaw)*-1, y = 0, z = math.cos(yaw)}
				nod = minetest.get_node_or_nil({x=s.x + self.direction.x,y=s.y+1,z=s.z + self.direction.z})
				print ("facing node", nod.name, dist)

				-- more than 2 nodes ahead then follow, otherwise stop
				if dist > 2 then
					if self.jump_height > 0 and self.object:getvelocity().y == 0 then
						local v = self.object:getvelocity()
						v.y = self.jump_height
						self.object:setvelocity(v)
					end
					self.set_velocity(self, self.speed)
				else
					self.set_velocity(self, 0)
				end
				-- break look after player found
				break
			end
		end

	end,
})

[Don]

Wow. Thanks!

[kaadmy]

The mob only needs to chase a player. There is no animation, punch or attack. I don't even want the player to be able to hit the mob.

Ah, Slimes from Terasology?

[MineYoshi]

NO!
i think is pacman!

[Don]

It is pacman. I should have it done in the next couple days. I am going to add more games to myboardgames modpack soon.

[Ferk]

I still think it would make more sense if the ghosts followed a more "square" pattern. You won't be able to use a standard pacman map if the ghosts spawn all in the center and follow this algorithm, or else they will always go in the same direction without spreading out. So you'll need them to spawn in the corners.

Anyway, even if the game turns out different than pacman, it still sounds like fun.

[Don]

I still think it would make more sense if the ghosts followed a more "square" pattern. You won't be able to use a standard pacman map if the ghosts spawn all in the center and follow this algorithm, or else they will always go in the same direction without spreading out. So you'll need them to spawn in the corners.

Anyway, even if the game turns out different than pacman, it still sounds like fun.

I made it look the same as the old pacman but removed a couple blocks from the ghost spawn area.

[Gaming Association]

so ull b able 2 play it like the original pacman arcade game?

[Don]

You will have to wait till it is released to see.

[Christian9]

mob only needs to chase a player. There is no animation, punch or attack. I don't even want the player to be able to hit the mob.

I could do that quickly.give me 3 days and I can get you something just like that

[Don]

mob only needs to chase a player. There is no animation, punch or attack. I don't even want the player to be able to hit the mob.

I could do that quickly.give me 3 days and I can get you something just like that

Pacmine is done already. It is in myarcade. The link is in my signature.