Stutter when the player is on the ground

Help Physics
, ,
1

Godot Version

Godot 4.3

Question

I made a super simple scene where there’s a character, a camera and a floor.
However, when I am on the ground, the screen begins to stutter; while I disable the gravity or just jump, the screen becomes smooth. What could be the problem?

Thanks in advance.

1
11920×924 109 KB

2
21920×924 114 KB

The character’s code(basically the default one but added the camera rotation):

extends CharacterBody3D


const SPEED = 5.0
const JUMP_VELOCITY = 4.5
var mouseSensibility := 600
var mouse_relative_x := 0
var mouse_relative_y := 0
@onready var Camera = $Camera3D

func _physics_process(delta: float) -> void:
	# Add the gravity.
	if not is_on_floor():
		velocity += get_gravity() * delta

	# Handle jump.
	if Input.is_action_just_pressed("ui_accept") and is_on_floor():
		velocity.y = JUMP_VELOCITY
		print(2)


	# Get the input direction and handle the movement/deceleration.
	# As good practice, you should replace UI actions with custom gameplay actions.
	var input_dir := Input.get_vector("ui_left", "ui_right", "ui_up", "ui_down")
	var direction := (transform.basis * Vector3(input_dir.x, 0, input_dir.y)).normalized()
	if direction:
		velocity.x = direction.x * SPEED
		velocity.z = direction.z * SPEED
	else:
		velocity.x = move_toward(velocity.x, 0, SPEED)
		velocity.z = move_toward(velocity.z, 0, SPEED)

	move_and_slide()

func _input(event):
	if event is InputEventMouseMotion:
		rotation.y -= event.relative.x / mouseSensibility
		Camera.rotation.x -= event.relative.y / mouseSensibility
		Camera.rotation.x = clamp(Camera.rotation.x, deg_to_rad(-90), deg_to_rad(90) )
		mouse_relative_x = clamp(event.relative.x, -50, 50)
		mouse_relative_y = clamp(event.relative.y, -50, 10)
2

Try switching collision shape of player to something simpler, like a capsule.

3

it is a capsule.

4

I’m talking about CollisionShape3D, not mesh.
On screenshot it shows “ConvexPoly” with array size of 1154.

1 Like
5

Cool, thanks!
Yeah, after changing CollisionShape3D to a real capsule, there is no stutter.

Also, I find that if I use Jolt Physics Engine, the stutter can be fixed as well.

1 Like
6

In general, when it comes to physics calculations, you want to use as simplest shape as possible. Maybe Jolts Physics Engine doing some auto optimizations.

1 Like