3D fps jumping and deceleration issue!

Help Programming
, ,
1

Godot Version

4.6

Question

I was making a WASD moment for my FPS game ( ONE MAG ), i started working on this project few days ago.

So the problems are :

  • When i press jump and release w the player while in the air decelerate to 0.0, stops on the position and come down.

  • The player when on floor decelerating, do not decelerate in diagonal direction.

The script :

extends CharacterBody3D

const SPEED = 10
const JUMP_VELOCITY = 7
var gravity = ProjectSettings.get_setting(“physics/3d/default_gravity”)
const mass = 5

func _ready():  #cursor capture
Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED)



func _unhandled_input(event):
if event is InputEventMouseMotion:
rotation.y -= event.screen_relative.x * 0.001
%Camera3D.rotation_degrees.x -= event.screen_relative.y * 0.1
%Camera3D.rotation_degrees.x = clamp(
%Camera3D.rotation_degrees.x, -60, 60
)
elif event.is_action_pressed(“ui_cancel”):
Input.set_mouse_mode(Input.MOUSE_MODE_VISIBLE)
elif event.is_action_pressed(“ui_accept”):
Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED)

func _physics_process(delta):

var decel = SPEED * 3.5 * delta


if not is_on_floor():
	velocity.y -= gravity * delta
else:
	velocity.y = move_toward(velocity.y, 0.0, decel)

if Input.is_action_just_pressed("jump") and is_on_floor():
	velocity.y += JUMP_VELOCITY

var input_dir = Input.get_vector("move_left","move_right","move_forward","move_back")
var direction = ( transform.basis * Vector3(input_dir.x, 0.0 , input_dir.y)).normalized()

if direction:
	velocity.x = direction.x * SPEED
	velocity.z = direction.z * SPEED
else : 
	velocity.x = move_toward(velocity.x, 0.0, decel)
	velocity.z = move_toward(velocity.z, 0.0, decel)

move_and_slide()
2

This deceleration is favoring diagonal as the X and Z individually both move by devel rather than a combined movement of devel. Split your movement into horizontal and vertical components so you can use Vector3’s move_toward

var vertical_velocity := velocity.project(up_direction)
var horizontal_velocity := velocity - vertical_velocity

if Input.is_action_just_pressed("jump") and is_on_floor():
	vertical_velocity += up_direction * JUMP_VELOCITY

horizontal_velocity = horizontal_velocity.move_toward(direction * SPEED, decel)

velocity = horizontal_velocity + vertical_velocity # recombine
move_and_slde()
1 Like
3

I tried it but somehow the moment become very slow !

extends CharacterBody3D

const SPEED = 10
const JUMP_VELOCITY = 7
var gravity = ProjectSettings.get_setting("physics/3d/default_gravity")
const mass = 5

func _ready():  #cursor capture
	Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED)

# PROBLEM AT (5,1),(6,7) AND UPPER MID😭
func _unhandled_input(event):
	if event is InputEventMouseMotion:
		rotation.y -= event.screen_relative.x * 0.001
		%Camera3D.rotation_degrees.x -= event.screen_relative.y * 0.1
		%Camera3D.rotation_degrees.x = clamp(
			%Camera3D.rotation_degrees.x, -60, 60
		)
	elif event.is_action_pressed("ui_cancel"):
		Input.set_mouse_mode(Input.MOUSE_MODE_VISIBLE)
	elif event.is_action_pressed("ui_accept"):
		Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED)

func _physics_process(delta):
	
	var decel = SPEED * 3.5 * delta
	var vertical_velocity := velocity.project(up_direction)
	var horizontal_velocity := velocity - vertical_velocity
	
	if not is_on_floor():
		vertical_velocity.y -= gravity * delta
	else:
		vertical_velocity.y = move_toward(vertical_velocity.y, 0.0, decel)
	
	if Input.is_action_just_pressed("jump") and is_on_floor():
		vertical_velocity += up_direction * JUMP_VELOCITY 
	
	var input_dir = Input.get_vector("move_left","move_right","move_forward","move_back")
	var direction = ( transform.basis * Vector3(input_dir.x, 0.0 , input_dir.y)).normalized()
	
	horizontal_velocity = horizontal_velocity.move_toward(
		direction, decel )
	
	velocity = vertical_velocity + horizontal_velocity
	
	move_and_slide()
4

You must multiply the direction by SPEED or you will move at one unit per second

2 Likes
5

Thanks !

6

The diagonal Deceleration issue resolved now the only issue remains is the Momentum in Jump issue.

7

What do you want to happen?

8

i want a inertia in Jump !

9

Reduce the decel value when the player is in the air. You can reduce it to zero to have total horizontal inertia or keep a low value so it still decelerates a little, but not as much as on the ground.