Lerp movement speed

Question

Hello, all! I have a ship that moves up, left, right, and down using this script:

 var moveSpeed : float = 5.0;
 
 function Update (){
     
     var x = Input.GetAxis("Horizontal") * Time.deltaTime * moveSpeed;
     var y = Input.GetAxis("Vertical") * Time.deltaTime * moveSpeed;
     
     transform.Translate(x, y, 0, Space.World);
     
 }

Simple stuff, right? Well I was wondering if there was a way for me to lerp the movement speed on each key press. For instance, when I hit the up key (When GetAxis"Vertical" == 1), the movement speed starts off slow, and builds up over a set float variable (number of seconds) to the target moveSpeed, and when the key is released, the same thing occurs, except backwards.

This would create a very nie 'sliding' kind of effect that I think would be appropriate for a space scene.

Thanks! - YA

Answer 1

Answer by markpdolby · Nov 12, 2012 at 05:55 PM

 var maxSpeed = 10;
 var x = 0;
 
 function Update(){
 if(Input.GetAxis("Horizontal") == 1)
 {
     x = Mathf.Lerp(x, maxSpeed, Input.GetAxis("Horizontal") * Time.deltaTime * moveSpeed);
 }
 else
 {
     x = Mathf.Lerp(x, 0, Input.GetAxis("Horizontal") * Time.deltaTime * moveSpeed);
 }
 //Then the same for Y etc.
 }

Something along those lines should point you in the right direction. Hope that helps.

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youngapprentice · Nov 12, 2012 at 05:59 PM 0

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That looks pretty good. I'll get back to you on how it works out.

youngapprentice · Nov 12, 2012 at 06:12 PM 0

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No... There's definitely something missing from here

markpdolby · Nov 12, 2012 at 06:18 PM 0

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What happens?

youngapprentice · Nov 12, 2012 at 06:25 PM 0

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I mean, besides the obvious "moveSpeed" variable and the actual Translation call.

Well, I hit the key, and the ship moves... I can't quite tell if it's lerping or not (I assume it must be).

What's missing is a Dampen variable. I'd like to have direct control over how much time it takes to accelerate/decelerate.

Also, the ship moves EXTRE$$anonymous$$ELY quickly

How is this working with the keys? I didn't know Input.GetAxis() could return anything but 1/0!

youngapprentice · Nov 12, 2012 at 07:10 PM 0

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Also, I would like to know how I would get this to function for moving the ship Downwards or left.

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Lerp movement speed

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