ScriptReference/Mathf.Lerp

[giscus[bot]]

ScriptReference/Mathf.Lerp

https://docs.unity3d.com/ScriptReference/Mathf.Lerp.html

[vertxxyz]

If you're looking for easing functions to transform your t value UnityEngine.UIElements.Experimental.Easing exists.
If you're not comfortable using an experimental API, you can find easing functions online, or you can copy the source (keep it in your project to avoid license issues) to maintain it yourself.

[FreyaHolmer]

Lerp Smoothing

If you do lerp-smoothing (dynamic exponential ease-out with a moving target) like this:

void Update(){
    value = Mathf.Lerp( value, target, factor ); // this is framerate dependent :(
}

The rate of decay will be different for different framerates, which is usually not what you want. Here are some framerate independent variants

Method 1 (express in terms of half-life)

value = Mathf.Lerp( value, target, 1-Mathf.Pow(2,-Time.deltaTime/h) );

h is the half-life $\lambda$, the time you want it to take to nominally get halfway to the target.

Method 2 (express in terms of remaining fraction per second)

value = Mathf.Lerp( value, target, 1-Mathf.Pow( c, Time.deltaTime ) );

$c$ is the remaining fraction of distance per second. If $c = 0.25$, then after 1 second, it will have 25% of the distance remaining

Conversion/Porting

Given your existing framerate-dependent setup where
$R$ is the current/ideal framerate where the old smoothing looked nice, such as $R=60$ for 60 fps
$f$ is the old smoothing factor you used in a = lerp( a, b, f )

Then,
For method 1: $\lambda = -1/(R\cdot\log_2(1-f))$ (calculator)
For method 2: $c = (1-f)^R$ (calculator)

Note that both $c$ and $\lambda$ are constants, so avoid calculating them every frame!

[QuinnCG]

Some alternative techniques, for the purposes of smoothing, are: Mathf.SmoothDamp, Vector2.SmoothDamp, and Vector3.SmoothDamp.

Vector3 velocity;

void Update()
{
	var target = new Vector3(0f, 5f, 0f);
	float duration = 0.2f;
	transform.position = Vector3.SmoothDamp(transform.position, target, ref velocity, duration);
	// Note: that "duration" is the number of seconds to go from the start to the target position.
}