Invalid operands 'Vector3' and 'Nil' in operator '*'

Help Programming
, ,
1

Godot Version

Question

I am trying to make an enemy move towards a point depending on its current state with this function. However every time I try to run the game I get the same error: Invalid operands ‘Vector3’ and ‘Nil’ in operator '*.

func MoveTowardsPoint(delta, speed):
	var targetPos = navigation_agent_3d.get_next_path_position()
	var direction = global_position.direction_to(targetPos)
	faceDirection(targetPos)
	velocity = direction * speed
	move_and_slide()
	if(playerInEarshotFar):
		CheckForPlayer()

The only time I call this function is in another function _process.

func _process(delta):
	CheckForPlayer()
	match currentState:
		States.patrol:
			if(navigation_agent_3d.is_navigation_finished()):
				currentState = States.waiting
				patrol_timer.start()
				return
			MoveTowardsPoint(delta, patrolSpeed)
			pass
		States.chasing:
			if(navigation_agent_3d.is_navigation_finished()):
				patrolTimer.start()
				currentState = States.waiting
			navigation_agent_3d. set_target_position(camera_3d.global_position)
			MoveTowardsPoint(delta, ChaseSpeed)
			pass
			
		States.hunting:
			if(navigation_agent_3d.is_navigation_finished()):
				patrolTimer.start()
				currentState = States.waiting
			MoveTowardsPoint(delta, patrolSpeed)
			pass
		States.waiting:
			CheckForPlayer()
			pass
	pass

The line giving the error is:

velocity = direction * speed

I have no idea how to fix the error and help would be greatly appreciated.

2

if you run this code you will get the same error

extends Node2D
var x
var v = Vector3(1,1,1)
func _ready():
	print(v * x)

make sure that

patrolSpeed

is set as something

1 Like
3

As HexY said your speed is null (Nil), meaning it has no value assigned to it.

The error:
Invalid operands ‘Vector3’ and ‘Nil’ in operator '*. says:

Your multiplication has invalid values. One of them is a vector3 and one of them is null. So your speed must be null.

Just keep that in mind for future errors. It’s helpful to understand the errors Godot shows.

4

func MoveTowardsPoint(delta, speed):
var targetPos = navigation_agent_3d.get_next_path_position()
var direction = global_position.direction_to(targetPos)
faceDirection(targetPos)
velocity = direction * speed
move_and_slide()
if(playerInEarshotFar):
CheckForPlayer()

Global position may equal target position when character is at the end of the path. Direction to does (A-b). normalized()

IDK what happens if a zero vector is normalized? It says a near zero vector will may point in an incorrect direction. But an absolute zero?