How to smoothly slow down a non-Rigidbody object

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I was wondering how I would smoothly slow down/decelerate to a stop a non-rigidbody object moving in a particular direction.

Answer 1

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Answer by Jeff-Kesselman · Jun 07, 2014 at 07:05 PM

Another approach is to add in a fixed drag by taking a drag rate an s multiplying it by the elapsed time

 float drag=2.0; // drag per sec
 
 public void Update(){
    float elapsedDrag = drag * Time.deltaTime;
   if (rigid body.velocity.x>0) {
          rigidbody.velocity.x = Math.max(rigidbody.velocity.x-elapsedDrag,0);
   } else {
          rigidbody.velocity.x = Math.minn(rigidbody.velocity.x+elapsedDrag,0);
   }
   if (rigid body.velocity.y>0) {
          rigidbody.velocity.y = Math.max(rigidbody.velocity.y-elapsedDrag,0);
   } else {
          rigidbody.velocity.y = Math.min(rigidbody.velocity.y+elapsedDrag,0);
   }
   if (rigid body.velocity.z>0) {
          rigidbody.velocity.z = Math.max(rigidbody.velocity.z-elapsedDrag,0);
   } else {
          rigidbody.velocity.z = Math.min(rigidbody.velocity.z+elapsedDrag,0);
   }
 }

The max/min is to clip it at 0.

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tanoshimi · Jun 07, 2014 at 07:06 PM 0

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Doesn't the OP say non-rigidbody?

Jeff-Kesselman · Jun 07, 2014 at 07:10 PM 0

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True, okay. Same thing but using your own velocity numbers.

BilboStabbins · Jun 10, 2014 at 12:21 AM 0

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Thanks for the suggestions.

Yes, it's a non-RB. Would you $$anonymous$$d, giving me an example of how to use this with a non-RB? I'm not having great success with describing the equivalent conditions to deter$$anonymous$$e the x, y, and z directions/movement (if .. > 0 , etc.) that it's moving in, in order to apply the correct position change.

Answer 2

Answer by HammockHead · Jun 07, 2014 at 05:10 PM

I'd imagine you would interpolate between the rigidbody's current velocity to an end velocity (in this case a velocity of 0,0,0). Something like this could possibly work :

 function slowDown(endVeclocity:Vector3) {
     startVelocity = rigidbody.velocity;
     rigidbody.velocity = Vector3.Lerp(startVelocity,endVelocity,Time.deltaTime)
 }

You could of course add a float to the third parameter of the Lerp function to simulate acceleration. Just a warning, I haven't test this yet but it should at least give you an idea.

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How to smoothly slow down a non-Rigidbody object

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