KinematicBody Question

quickmind2020

So I have a KinematicBody that has a collision shape for it and a mesh node for it. I have it set up in the code to move forward when i press w. This is the basics of the code.

if move_forward == true: player.move(Vector3(0,0,1))

Player is just a shortcut I made its linked to

get_node("player")

The error I get in the debugger is

Space State Is inaccessible right now, wait for iteration or fixed process notification.

And my character doesn't move. What is happening? EDIT:Ok so I looked into some demos and found this

extends KinematicBody const ACCEL= 2 const DEACCEL= 4 const MAX_SPEED = 10 var vel = Vector3() onready var cam = get_node("cam") func ready(): set_fixed_process(true) func fixed_process(delta): var dir = Vector3() # Where does the player intend to walk to var cam_xform = cam.get_global_transform() if Input.is_key_pressed(KEY_W): dir += -cam_xform.basis[2] if Input.is_key_pressed(KEY_S): dir += cam_xform.basis[2] if Input.is_key_pressed(KEY_A): dir += -cam_xform.basis[0] if Input.is_key_pressed(KEY_D): dir += cam_xform.basis[0] dir.y = 0 dir = dir.normalized() var hvel = vel hvel.y = 0 var target = dirMAX_SPEED var accel if (dir.dot(hvel) > 0): accel = ACCEL else: accel = DEACCEL hvel = hvel.linear_interpolate(target, acceldelta) vel.x = hvel.x vel.z = hvel.z move(vel*delta)

So Can some one explain how and why this works? I understand the cam_xform.basis but besides that Im confused

Ghost

I'm not a pro, but I'll explain it as I understood it. What I did is comment each line out and see what stopped working. Every variable used (except the const) is either a Vector or a Scalar. Here is a great start if you don't understand. http://docs.godotengine.org/en/latest/tutorials/vector_math.html dir is Vec3 After the basis inputs we want to make sure Y is at 0, because that is vertical direction in Godot. dir then gets normalized. Keeps the direction, but magnitude is reduced to 1. I believe though not sure hvel is the velocity while moving horizontally which then gets Y zero'd out. Target is used to increase the "length" of the arrow. The result is how fast you can move. If you multiply it by 0, you have a length of zero, and you cannot move. var accel is used as a switch between ACCEL and DEACCEL. The switch happens when the dot product between vec dir and vec hvel is > 0. Because if dir isn't changing (you aren't pressing anything), the scalar returned will be < 0, ie you are DEACCEL. Lerp is used to smooth the movement. finally use move(vel * delta) to do the actual moving.

quickmind2020

Ok thanks That helps a lot but It still leaves a question in mind. Why wouldn't this work

if forwards = true: player.move(Vector3(0,0,1))

Because I supplied a Vec3 to it so... whats happing?

danjo

IIRC you need to call .move() from _fixed_process(), did you do that?

Ghost

First print out the value of forwards to the console, make sure it does actually equal true. Twice if you have to, before and after the value should change. print(forwards) Secondly player.move should just be move(velocity delta) player.move implies that class Player has a function called move(), that is what you are calling. Unless this is what you intended. But I think not, you want to use KinematicBody's move(). Since the script extends KinematicBody you only type move(vector scalar). The result will be a new vector because....velocity is a vector3, it multiplies by delta resulting either in a smaller or larger magnitude.

quickmind2020

<a target="_blank" rel="nofollow">Ghost</a> said:

</blockquote> If you read my earlier post it says that player is just a link to get_node("player")  this "player" is a kinematic node, but this doesn't answer why you cant just place a vector into the .move() function. The script also doesnt need to extend KinematicBody. im using a Spatial node right now with that example move script and it works... I just dont understand why you have to modify vel with hvel so much to make it to move

razvanc-r

Are you sure it's the move function? I just tried this:

extends KinematicBody func _ready(): set_fixed_process(true) func _fixed_process(delta): if Input.is_key_pressed(KEY_W): move(Vector3(0, 0, 1))

and I'm not getting any error. Plus it is extraordinary that this specific error string 'Space State Is inaccessible right now, wait for iteration or fixed process notification' cannot be found in godot's source code. That's really interesting. What version are you using? What line of code was your error pointing to and what was the original script? You can make a demo project and submit a bug report on github...

quickmind2020

Ok I don't know what in the world happened but something changed... it works now... makes me wonder if it was my system that need to be restarted or something like that.... Thanks for all the response!