3D tank contol - help needed

Help Programming
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1

Godot Version

Godot 4.6

Question

Hello, I’m working on a 3d platformer using tank controls and i cant get gravity to work at all. I have this currently, built of the default movement script.

extends CharacterBody3D


@export var move_speed: float = 6.0
@export var turn_speed: float = 3.0
@export var JUMP_VELOCITY = 45



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_released("ollie") and is_on_floor():
		velocity.y  = JUMP_VELOCITY
		print(velocity)
	
	var input_vector = Input.get_vector("turn_right", "turn_left", "move_down", "move_up")
	
	# Rotate the body
	rotate_y(input_vector.x * turn_speed * delta)
	
	# Set velocity based on the local Z-axis (forward)
	var speed = input_vector.y * move_speed
	velocity = -global_transform.basis.z * speed
	
	move_and_slide()

Any help would be great, thanks!

2

how exactly does it fail? give us a 5-second screen capture for a clue

3

You add the gravity to velocity in the beginning:

	# Add the gravity.
	if not is_on_floor():
		velocity += get_gravity() * delta

But then you’re overwriting the whole velocity at the end without preserving the gravity:

	# Set velocity based on the local Z-axis (forward)
	var speed = input_vector.y * move_speed
	velocity = -global_transform.basis.z * speed

You need to preserve the y component of the velocity after you add gravity to it.