About

Features

• Smooth movement towards a goal using A* and steering
• Movement profiles that change based on the terrain
• Avoid hazards such as blocks, entities and coordinates

Usage

Installation

• Install the plugin into your project folder using NPM:

npm install mineflayer-trailblazer

API

Methods

(API Reference)

// returns a promise; resolves when the goal is complete, rejects if it is stopped midway
bot.trailblazer.goto(goal, ...hazards?)

// only for tick function; sets the goal and hazards to avoid internally.
bot.trailblazer.setGoal(goal, ...hazards?)

// applies a tick of movement, updating the path, changing control states and yaw, etc.
bot.trailblazer.tick()

// stops all ongoing movement operations and clears control states (note this will reject the goto promise)
bot.trailblazer.stop(reason?)

// applies a tick of movement, but only returns the yaw.
bot.trailblazer.getYaw()

// returns the control states required to move towards the yaw value
bot.trailblazer.getControls(yaw)

// configures one of the three navigation modules (see configuration below)
bot.trailblazer.configure(category)

(Getting from A to B)

• Promise based approach:

bot.once("spawn", async function init() {
  await bot.trailblazer.goto(goal, ...hazards?)
  bot.chat("Arrived at goal")
})

• Tick/loop based approach:

bot.on("physicsTick", function tick() {
  bot.trailblazer.setGoal(goal, ...hazards?)
  bot.trailblazer.tick()
})

Goals

(API Reference)

const { Radius, RadiusCB, Avoid, AvoidCB } = require("mineflayer-trailblazer").goals

// complete when within a certain radius of a static position
new Radius(destination, radius)

// complete when within a certain radius of a dynamic position (returned by the callback)
new RadiusCB(callback, radius)

// complete when a certain distance away from a position
new Avoid(position, distance)

// complete when a certain distance away from a changing position (returned by the callback)
new AvoidCB(callback, distance)

(Static goals)

• Static goals only set a position once and don't update dynamically (unless using a tick/loop approach)

const { Radius } = require("mineflayer-trailblazer").goals

bot.once("spawn", async function init() {
  const entity = bot.nearestEntity(entity => entity.type === "player")
  const goal = new Radius(entity.position) // entity.position will not update if the entity moves somewhere else
  await bot.trailblazer.goto(goal)
})

(Dynamic goals)

• Dynamic goals use a callback function to query a position, allowing it to change during operation

const { RadiusCB } = require("mineflayer-trailblazer").goals

bot.once("spawn", async function init() {
  const entity = bot.nearestEntity(entity => entity.type === "player")
  const goal = new RadiusCB(() => entity.position) // callback will always return the updated position
  await bot.trailblazer.goto(goal)
})

Hazards

• Hazards change the cost of travelling to a node if certain conditions are met.
• All hazards have weight, which acts as a final multplier on the cost by 1 + weight
• An instance of a hazard can be updated dynamically using Setters (see below)

(API Reference)

const { Block, Entity, Position } = require("mineflayer-trailblazer").hazards

// applies weight from certain blocks at an offset to the current node
new Block(bot, weight?, offset?, avoid?)
  .weight(number)
  .offset(Vec3)
  .avoid(Object) // key/value object mapping block name (string) to boolean

// applies weight to nodes within a radius of the specified entities
new Entity(weight?, radius?, entities?)
  .weight(number)
  .radius(number)
  .entities(Entity[])

// applies weight to nodes within a radius of the coordinates specified
new Position(weight?, radius?, coordinates?)
  .weight(number)
  .radius(number)
  .coordinates(Vec3[])

Configuration

• Three primary modules make up the navigation algorithm, being movement, pathfinding, and traversal
• Each module is configurable using a dynamic builder instance created with the configure function
• It is recommended to keep one configuration instance (per module) during the lifetime of your program.

(API Reference)

const instance = bot.trailblazer.configure('movement' | 'pathfinder' | 'traversal')
// instance.[etc...]

(Movement)

• Changes movement behaviour whilst moving between nodes
• Refer to mineflayer-movement README for more information

bot.trailblazer.configure('movement')
  .jumpSprint(boolean) // whether to always jump regardless
  .fov(number) // frame of vision used for movement
  .rotations(number) // total rotations used for movement
  .blend(number) // blend used for movement
  .goalHeadless(MovementGoal) // used instead of pathfinding if the path is too small
  .goalGround(MovementGoal) // following a path, on the ground
  .goalAirborne(MovementGoal) // following a path, jumping/falling
  .goalSwimming(MovementGoal) // not following a path, in water
  .goalClimbing(MovementGoal) // following a path, climbing up blocks

(Pathfinder)

• Configures the path that the player will take to get to the destination
• Refer to mineflayer-pathfinder-lite README for more information

bot.trailblazer.configure('pathfinder')
  .avoid(Object) // key/value object mapping block name (string) to boolean
  .depth(number) // maximum depth the pathfinder can descend blocks
  .blocks(number) // how many blocks to check, maximum
  .timeout(number) // how many miliseconds to find a path, maximum
  .minimumNodes(number) // the minimum nodes a path can have before switching to headless mode

(Traversal)

• Modifies the requirements needed to get to the next node

bot.trailblazer.configure('traversal')
  .prevision(number) // how many nodes to look ahead
  .radiusXZ(number) // how far within horizontal distance of a node
  .radiusAscent(number) // how far within vertical distance of a node whilst climbing up
  .radiusDescent(number) // how far within vertical distance of a node whilst descending

Examples

const mineflayer = require("mineflayer")
const trailblazer = require("trailblazer").plugin

const bot = mineflayer.createBot()

const { RadiusCB } = require("trailblazer").goals
const { Entity } = require("trailblazer").hazards

bot.once("spawn", async function init() {
  const entity = bot.nearestEntity(entity => entity.type === "player")
  
  if (entity) {
    const goal = new RadiusCB(() => entity.position, 3) // use callback to dynamically update position
    const hazard = new Entity(1, 5) // cost multiplier: +100%, radius: 5
      .entities(Object.values(bot.entities).filter(entity => entity.type === "mob"))
      
    await bot.trailblazer.goto(goal, hazard)
    bot.chat("Arrived")
    return
  }
  
  bot.chat("I can't see anyone!")
})