Need Help with Godot 4 3D mouse movement

Help
,
1

Godot Version

4

Question

Hellooo I’m new to game design and I’m trying to make a 3d top down game, with moba-type movement. I’m using raycasting and it works, but it’s very inaccurate sometimes. Also I want my character to move to the click position, but my character moves to click position only when I hold the mouse button.

This is the code:

extends CharacterBody3D

@export var SPD = 10
@export var fall_acceleration = 75

var target_velocity = Vector3.ZERO

func mouse_cast():
var space_state = get_world_3d().direct_space_state
var camera = get_tree().root.get_camera_3d()
var mouse_position = get_viewport().get_mouse_position()
var origin = camera.project_ray_origin(mouse_position)
var end = origin + camera.project_ray_normal(mouse_position) * 1500
var query = PhysicsRayQueryParameters3D.create(origin, end)
query.collide_with_areas = true
query.exclude = [self]

var result = space_state.intersect_ray(query)

if result.has("position"):
	return result["position"]
return Vector3()

func move(delta):
var direction = Vector3.ZERO

if Input.is_action_pressed("click_move"):
	direction = mouse_cast()

if direction != Vector3.ZERO:
	direction = direction.normalized()
	direction.y = 0
	$Pivot.basis = Basis.looking_at(-direction)

target_velocity.x = direction.x * SPD
target_velocity.z = direction.z * SPD

if not is_on_floor():
	target_velocity.y = target_velocity.y - (fall_acceleration * delta)

if position.distance_to(mouse_cast()) > 1:
	velocity = target_velocity
	move_and_slide()

func fall_n_die():
if self.position.y < -8:
get_tree().quit()

func _physics_process(delta):
move(delta)
fall_n_die()

Thank you very much!

2

Note: the Camera node is a child node of the player node and uses orthogonal projection

3

It stops when you’re not pressing the mouse button because direction gets reset to zero every frame. Try something like this, have a target_position variable that don’t get reset and the character can keep going towards it (I haven’t tested it…)

var target_pos = Vector3.ZERO

func move(delta):
    var direction = Vector3.ZERO
	if Input.is_action_pressed("click_move"):
		target_pos = mouse_cast()
	
		if target_pos != Vector3.ZERO:
			direction = target_pos.normalized()
			direction.y = 0
			$Pivot.basis = Basis.looking_at(-direction)
	
	target_velocity.x = direction.x * SPD
	target_velocity.z = direction.z * SPD
	
	if not is_on_floor():
		target_velocity.y = target_velocity.y - (fall_acceleration * delta)
	
	if position.distance_to(target_pos) > 1:
		velocity = target_velocity
		move_and_slide()
    else:
        velocity = Vector3.ZERO
1 Like
4

It works well, but I think there is a problem with detecting the mouse position (mouse_cast function), because if I click near my character it’s fine, but if click far away it’s completely off.
Code:

func mouse_cast():
var space_state = get_world_3d().direct_space_state
var camera = get_tree().root.get_camera_3d()
var mouse_position = get_viewport().get_mouse_position()
var origin = camera.project_ray_origin(mouse_position)
var end = origin + camera.project_ray_normal(mouse_position) * 4000
var query = PhysicsRayQueryParameters3D.create(origin, end)
query.collide_with_areas = true
query.exclude = [self]

var result = space_state.intersect_ray(query)

if result.has("position"):
	return result["position"]
return Vector3()
5

I don’t know, I’m using the same code and it works for me, though my camera isn’t orthogonal so maybe it has something to do with that.

6

I’ll look into it. Thanks a mill!