moving a 3D cube

juluson

Hi all,

My question is the following : how to move a 3D cube with the mouse along the x and y axes. I have imported the cube in a MeshInstance. And tried this code:

get_node("MeshInstance1").set_pos(get_viewport().get_mouse_pos())

But it doesn't work.

Your help is welcome,

A+

Elf_Ears

To the best of my knowledge, that would be because the mouse position is a 2d vector (Vector2) and the cube's position is a 3d vector (Vector3)

if you wanted to do something like that i'd leave one axis as zero (Vector3(get_viewport().get_mouse_pos().x,get_viewport().get_mouse_pos().y,0))

(Keep in mind that I'm mostly a 2D user so if I'm making some obvious mistake forgive me)

juluson

Thanks for your help,

but when I try the following code :

get_node("U").set_pos(Vector3(get_viewport().get_mouse_pos().x,get_viewport().get_mouse_pos().y,0))

This one doesn't work. In effect the cube doesn't move

Thanks for your ideas

A+

Avencherus

Spatials don't use set_pos(), they use set_translation(), or translate() for offsetting, or there is the option to manipulate the transform's origin.

http://docs.godotengine.org/en/stable/classes/class_spatial.html#class-spatial-set-translation

You're also likely going to run into problems with using the direct screen coordinates, the spaces won't match, so anything beyond a few dozen pixels is going to be out of view of your camera. One unit in screen space is 1 pixel, and in 3D space it's 1 cubic grid unit.

The camera offers a variety projection functions that can map screen coordinates to 3D points using raycasts.

http://docs.godotengine.org/en/stable/classes/class_camera.html#class-camera-project-position

zendorf

Is there any particular reason to want to use the mouse to move a box? Usually you would want to use the keyboard(WASD or arrows) to move the players' position and mouse for rotation/direction. By using the input map in Godot, it is quite simple to map keys or the gamepad as input.

Something like this gives you the barebones code of how to go about this:

    extends KinematicBody
    
    var speed = 5
    var velocity = Vector3()
    func _ready():	
		set_fixed_process(true)	
    
    func _fixed_process(delta):	
    	move_player(delta)
    
    func move_player(delta):
    	velocity = Vector3(0, 0, 0)
    	if (Input.is_action_pressed("ui_left")):			
    		velocity.x = -speed 		
    	if (Input.is_action_pressed("ui_right")):
    		velocity.x = speed		
    	if (Input.is_action_pressed("ui_up")):
    		velocity.z = -speed
    	if (Input.is_action_pressed("ui_down")):
    		velocity.z = speed
    	move(velocity * delta)