Diagonal movement causes jitter

ProbablyTooAmbitious

When the player moves diagonally, they jitter. It isn't very obvious with the gif so I'm sorry about that. This is the script for movement:

extends KinematicBody2D

var velocity = Vector2()
func _physics_process(delta):
	if Input.is_action_pressed("ui_right"):
		velocity.x = 60
	elif Input.is_action_pressed("ui_left"):
		velocity.x = -60
	else:
		velocity.x = 0
	if Input.is_action_pressed("ui_up"):
		velocity.y = -60
	elif Input.is_action_pressed("ui_down"):
		velocity.y = 60
	else:
		velocity.y = 0
	move_and_slide(velocity.normalized() * 60)

I know this has something to do with normalized() because the jitter problem is fixed when it's removed, but that causes the diagonal movement to be faster.

7892

Not sure if this will fix your problem but move_and_slide() returns a vector you should use.

Try: velocity = move_and_slide(velocity.normalized() * 60)

Btw: I still dont know if move_and_slide uses delta automatically or if you need to apply it but this might be another problem.

Nanites

@7892 said: Btw: I still dont know if move_and_slide uses delta automatically or if you need to apply it but this might be another problem.

It does, from the docs:

This method should be used in Node.physics_process (or in a method called by Node.physics_process), as it uses the physics step's delta value automatically in calculations.

ProbablyTooAmbitious

@7892 said: Not sure if this will fix your problem but move_and_slide() returns a vector you should use.

Try: velocity = move_and_slide(velocity.normalized() * 60)

Btw: I still dont know if move_and_slide uses delta automatically or if you need to apply it but this might be another problem.

I tried this - it doesn't seem to have fixed the problem. I appreciate the help regardless!

cybereality

I'm not seeing the jitter on my system. But I made some changes so floating point values are used. You can just set to 1.0 on the key pressed, you are normalizing anyhow so the magnitude of the value doesn't matter. So it could be that you were using integers, but Godot should convert these automatically.

extends KinematicBody2D

var velocity = Vector2()

func _physics_process(delta):
	if Input.is_action_pressed("ui_right"):
		velocity.x = 1.0
	elif Input.is_action_pressed("ui_left"):
		velocity.x = -1.0
	else:
		velocity.x = 0.0
	if Input.is_action_pressed("ui_up"):
		velocity.y = -1.0
	elif Input.is_action_pressed("ui_down"):
		velocity.y = 1.0
	else:
		velocity.y = 0.0
	move_and_slide(velocity.normalized() * 180.0)

The other issue could be with the window size or pixel dimensions of the screen. If you are doing any sort of scaling (like setting test width / height) or zooming, etc. then this can affect pixel coordinates in strange ways.

Also, you test image has a stripe pattern in the background. This my make it a psychological effect. Meaning there is no jitter, but the pattern makes your brain perceive that. The human brain is weird. You should try with a blank background.