Mathf.lerp not finishing the lerp(age)

Questions & Answers
1

I am currently trying to make a Slider that smoothly goes from 0f to 100f, taking 100 seconds.

On my current way of making it work, that looks like this:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class swordui : MonoBehaviour
{
    public Slider swordslider;

    public float valuee;
    public float speed = 0.01f;
    public bool commit;

    public void Awake()
    {
        commit = false;
        valuee = 100f;
    }
    public void settozero()
    {
        valuee = 0f;
    }
    public void commitmoment()
    {
        commit = true;
    }
    public void Update()
    {
        swordslider.value = valuee;
        if(commit == true)
        {
            valuee = Mathf.Lerp(swordslider.value, 100f, speed);
            if (swordslider.value == 100f)
            {
                commit = false;
            }
        }
    }
}

but this causes it to slow down by the end of the countdown. When I try to change it to:

            valuee = Mathf.Lerp(0f, 100f, speed * Time.deltaTime);

it only counts up to 1, and then stops lerping.

How can I make it fully count from 0f to 100f, taking 100 seconds to do that, and without stalling by the end?

2

In the first case, you experienced one of the Zeno’s paradoxes. Basically you are overwriting the initial value of the interpolation over and over, which in turn makes the interpolation non-linear. Your second approach is better, but you are not accelerating the time, your value will stay the same forever. What you should do is:

private float _timeAccel = 0;
private float _start = 0.0f, _end = 100.0f;
private float _speed = 0.01f;

private void Update()
{
        value = Mathf.Lerp( _start, _end, _timeAccel );
        _timeAccel += Time.deltaTime * _speed;
}

Also, don’t worry if _timeAccel exceeds 1, the Lerp will always clamp it between 0 and 1.
Good luck!