rj-action-library/Runtime/Math/Smoother.cs

using System.Collections;
using System.Collections.Generic;
using Godot;

namespace Rokojori
{
	public class Smoother
	{
    float overflowDelta = 0;

    public float SmoothForDuration( float value, float nextValue, float duration, float delta, float processDelta = MathX.fps120Delta )
    {
      var coefficient = MathX.SmoothingCoefficient( duration * 1000f );
      return SmoothWithCoefficient( value, nextValue, coefficient, delta );
    } 


    public float SmoothWithCoefficient( float value, float nextValue, float coefficient, float delta, float processDelta = MathX.fps120Delta )
    {
      overflowDelta += delta;

      while ( overflowDelta > processDelta )
      {
        value += coefficient * ( nextValue - value );
        overflowDelta -= processDelta;
      }

      return value;
    } 


    public Quaternion SmoothForDuration( Quaternion value, Quaternion nextValue, float duration, float delta, float processDelta = MathX.fps120Delta )
    {
      var coefficient = MathX.SmoothingCoefficient( duration * 1000f );
      return SmoothWithCoefficient( value, nextValue, coefficient, delta );
    } 

    public Quaternion SmoothWithCoefficient( Quaternion value, Quaternion nextValue, float coefficient, float delta, float processDelta = MathX.fps120Delta )
    {
      overflowDelta += delta;

      while ( overflowDelta > processDelta )
      {
        value = value.Slerp( nextValue, coefficient );
        overflowDelta -= processDelta;
      }

      return value;
    } 
  }
}