Convert one range of Number to another range in C# Unity3d

Converting one range of numbers to another range is very common. In unity, you often want to convert one number range to another number range. Like I want to map 1 to 100 numbers into 1 to 1000. Let's see a practical example, I want to enable the user to set object Transparency using a text-field where the user can enter transparency value. Like from 0 to 100 he can assign an alpha/Transparency/Opacity value but behind the scenes, the alpha value can be from 0 to 1. Then, what should happen? Here range conversion will be required.

(You can also watch how to set object transparency using C# code in blow video.)

Now to handle this thing we have to remap one range of numbers to another range. Therefore this handy function I have found in this > thread and sharing with you some naming improvements.

	using UnityEngine;
	public class ConvertOneRangeToAnother : MonoBehaviour
	{
	[Header("Input Value to convert")]
	public float inputValue = 10;
	[Header("Input Range")]
	public float StartInputRange = 0;
	public float EndInputRange = 100;
	[Header("Output Range")]
	public float StartOutputRange = 0;
	public float EndOutputRange = 1;
	void Update()
	{
	Debug.Log(remap(inputValue, StartInputRange, EndInputRange, StartOutputRange, EndOutputRange));
	}
	/// <summary>
	/// convert one range to another range
	/// </summary>
	/// <param name="valueToConvert">input value to convert</param>
	/// <param name="StartInputRange"></param>
	/// <param name="EndInputRange"></param>
	/// <param name="StartOutputRange"></param>
	/// <param name="EndOuputRange"></param>
	/// <returns></returns>
	public static float remap(float valueToConvert, float StartInputRange, float EndInputRange, float StartOutputRange, float EndOuputRange)
	{
	return StartOutputRange + (valueToConvert - StartInputRange) * (EndOuputRange - StartOutputRange) / (EndInputRange - StartInputRange);
	}
	}

view raw ConvertOneRangetoAnother hosted with ❤ by GitHub

you can call Remap(5, 1, 10, -50, 100) with these parameters and it will return the converted number. Here is the function calling explanation:

1. First Parameter represent the actual number we want to convert
2. 2nd n 3rd Parameter: The actual range start/stop
3. 3rd n 4th Parameter: The convert range start/stop