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Question by mirkojpn · Nov 28, 2018 at 02:40 PM · c#timelerpmathfmathf.lerp

how to use time on lerp

hi everyone, iàm trying to undestand how to make my lerp start faster like an impulse, the slow it overtime, iàm using this now

 float t = currentLerpTime / lerpTime;
 t = Mathf.Sin(t * Mathf.PI * 0.5f);


but doesnàt work as expected.. what i missing?

thank's you in advance

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avatar image ecv80 · Nov 28, 2018 at 02:46 PM 0
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I passed my finger over your first Iàm to remove the dust particle off the screen ¯_(ツ)_/¯

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Answer by jenci1990 · Nov 28, 2018 at 03:01 PM

This is a sinusoidal easing timing, but there are some other useful easing math. Try these:

  //Sinusoidal (same as yours)
 t = Mathf.Sin(t * Mathf.PI / 2f);
 //Quadratic
 t = t * (2 - t);
 //Cubic
 t = t * t * t + 1;
 //Exponential
 t = t == 1f ? 1f : 1f - Mathf.Pow(2f, -10f * t);
 //Circular
 t = Mathf.Sqrt(1f - (--t * t));

If these one not working, you make a mistake elsewhere.

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avatar image Sylon87 · Nov 28, 2018 at 03:15 PM 0
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Thank’s you for your reply, so i should be on the right way, im doing PI * 0.5f, but in your example it is for 2, maybe i should increase it to make it as i want

avatar image Legend_Bacon · Nov 28, 2018 at 03:39 PM 0
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Hello there,


This answer is definitely correct.


To add to this, I like to send people to this page when talking about lerps and curves. Hopefully it helps!


Cheers,

~LegendBacon

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Answer by UnityCoach · Nov 28, 2018 at 07:09 PM

You may want to use an AnimationCurve.

 [SerializeField] AnimationCurve timeWarpCurve;
 
 float t = timeWarpCurve.Evaluate(Time.time);
 t = Mathf.Sin(t * Mathf.PI * 0.5f);
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