transform.localPosition help

Unity Engine
1

Hello,

I would liek to start out by explaining that i am New to Scripting.

I am trying to make a ‘Character controller’, I know there is one in unity already, But it is a challenge to create my own one, and it wil help me pick things up along the way,

I have done this code and hoped it would work, But it just teleports me to X:0 Y:0 Z:5e-05

I thought that this code would move the box along the local Z axis at 5 unity per second, Apparently i was wrong.

Please help me figure this out, Thanks!

var normSpeed : float = Time.deltaTime * 5;
var sboostSpeed : float = Time.deltaTime * 8;


function Update () {

		if(Input.GetKeyDown ("w")){
			transform.localPosition = Vector3(0, 0, normSpeed);
		}

}
2
  1. If you are using a CharacterController, use CharacterController.Move or CharacterController.SimpleMove
  2. If you are not using a CharacterController, use transform.Translate.
  3. Use Input.GetAxis rather than GetKeyDown
  4. Time.deltaTime*5 = 5e-05. That is why it is moving you to that position.
  5. Multiply your movement speed by Time.deltaTime every frame. Not when you declare the variable. It is constantly changing.
3

Couple of mistakes:

var normSpeed : float = Time.deltaTime * 5;
var sboostSpeed : float = Time.deltaTime * 8;

Should be:

var normSpeed : float = 5;
var sboostSpeed : float = 8;

Time.deltaTime changes every frame - you can’t simply call it once and save it (which is what you are doing here).

transform.localPosition = Vector3(0, 0, normSpeed);

Should be:

transform.localPosition += Vector3(0, 0, normSpeed) * Time.deltaTime;

or

transform.localPosition += transform.forward * normSpeed * Time.deltaTime;

If you want to move, you have to add the speed you moved, not simply move to the speed you moved (which doesn’t make much sense!). I also showed an appropriate usage of Time.deltaTime.

4

Thanks!, But

transform.localPosition += Vector3(0, 0, normSpeed) * Time.deltaTime; moves me on the Worlds Z axis, doesn’t localPosition mean the the Vector3 in relation to the Object, and not World?

5

Nope, it is in relation to the parent transform.

Try this:

transform.position += transform.forward * Input.GetAxis("Vertical") * normSpeed * Time.DeltaTime;

(Prob. got spell errors).

6

What does the += mean?

7

Nope, it is in relation to the parent transform.

Try this:

var normSpeed : float = 5;

function Update () {
transform.position += transform.forward * Input.GetAxis("Vertical") * normSpeed * Time.deltaTime;
}
8

i tried Input.GetKeyDown, but then i get the error “Operator ‘*’ cannot be used with a left hand side of type ‘UnityEngine.Vector3’ and a right hand side of type ‘boolean’” ?

9

Think about it simply in 1 dimention.

I am at 10.

I move 1.

position += distance traveled

(new) position = position + distance traveled

(new) position = 10 + 1

My position is now 11.

Exactly what it says. You cannot times a Vector by a boolean. Use the script reference and take a look at the result of Input.GetAxis and Input.GetAxisDown.

10

There is no GetAxisDown because it is a Axis, Not a button?, i want to use W to move, not “Vertical” Axis?

I’m probably completly wrong, so apologies

11

This is a simple example showing GetAxis.

Try the W S (Up Arrow) and (Down Arrow) keys.

If you still want to do it on just w:

var normspeed = 15;

function Update(){
if (Input.GetKey("w")){
transform.position += Vector3(0, 0, normSpeed) * Time.deltaTime;
}
}
12

Thanks, But when i use

transform.position += transform.forward * Input.GetAxis(“Vertical”) * normSpeed * Time.deltaTime; it moves once when i press it, How would i make it keep moving while i hold it?

13

It already keeps moving while you hold it, see the demo.

14

Not in my game, Here’s the code

 var normSpeed : float =  5;
var boostSpeed : float =  8;


function Update () {

		if(Input.GetKeyDown ("w")){
			transform.position += transform.forward * Input.GetAxis("Vertical") * normSpeed * Time.deltaTime;

		}

}
15

In that scenario get rid of Input.GetAxis.

Why are you checking for Input twice?

Futhermore research the difference between GetKey() and GetKeyDown().

16

Sorry i Pasted the wrong code, i was Undoing changes i made and i didn’t go back all the way so you got Half of one code and Half of another there

17

The problem was i left another Code attached to the object that seemed to be conflicting, Silly me