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Question by British89 · May 24, 2012 at 11:02 PM · rotationgravityspace

Drift Rotation

Hello, I'm in the middle of making a space simulator and i have all the spaceship controls working perfectly, Everything is smooth apart from when i "Roll" its too sudden, Is it possible to make it slowly build up rotate speed as i press the button then once released it will gradually slow down to a stop, like as if air is being forced out of the wings to stabilize the rotation. I'm just trying to make it seem as real to space as possible and this 1 tiny thing is holding me back,

Thanks.

 function FixedUpdate(){
 
     if(SystemStatus){
 
         if (Input.GetKey ("d")){ 
 
             transform.Rotate(0,0,- 1.0);
 
         }
 
 
        if (Input.GetKey ("a")) {
 
             transform.Rotate(0,0,1.0);
 
         }
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Answer by aldonaletto · May 24, 2012 at 11:14 PM

You can add inertia to the controls using a "Lerp filter" - it's a special trick with Lerp that smooths out the input signal, thus the ship will not start/stop rolling immediately. You should also use Time.deltaTime to have a predictable and framerate independent roll speed.

var rollSpeed = 60; // roll speed in degrees per second var filterSpeed = 5; // how fast the filter follows the key private var rollDir: float = 0;

function FixedUpdate(){ if (SystemStatus){ var rollCtrl = 0; if (Input.GetKey("d")) rollCtrl = -1; if (Input.GetKey("a")) rollCtrl = 1; // rollDir is a smoothed version of rollCtrl rollDir = Mathf.Lerp(rollDir, rollCtrl, Time.deltaTime filterSpeed); // use Time.deltaTime to have a framerate independent roll speed transform.Rotate(0, 0, rollDir rollSpeed * Time.deltaTime); } }

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avatar image British89 · May 24, 2012 at 11:27 PM 0
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Spot on! I have been fiddling around with it for hours, You do it in 10 $$anonymous$$s, Brilliant lol, Thanks allot for the help!

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