Bunny Annah Stones: Player Light

using UnityEngine;

public class PlayerLight : MonoBehaviour
{
    [SerializeField]private float _distanceLightGoesOn = -10.0f;
    [SerializeField]private float _distanceLightIsMax = 200.0f;
    [SerializeField]private float _lightMaxBrightness = 2.0f;
    [SerializeField]private float _flickerSpeed = 1.0f;
    [SerializeField] private float _flickerSize = 0.25f;
    [SerializeField] private Light _light = null;
    private float _lightOffsetNoise = 0;

    void Update ()
    {
        var depthForLight = transform.position.y;
        depthForLight += _distanceLightGoesOn;
        depthForLight *= -1;

        //Calculate if light should be on
        var lightShouldBeOn = depthForLight > 0;
        if (!lightShouldBeOn)
        {
            _light.enabled = false;
        }
        else
        {
            _light.enabled = true;

            //Calculate depth for the intensity
            depthForLight /= (_distanceLightIsMax - _distanceLightGoesOn);
            depthForLight = Mathf.Min(depthForLight, 1);

            //Calculate the flicker amount
            _lightOffsetNoise += Time.deltaTime*_flickerSpeed;
            var flickerDecreaseAmount = 1-((1 - Mathf.PerlinNoise(_lightOffsetNoise, 0))*_flickerSize);

            //Calculate final intensity
            _light.intensity = _lightMaxBrightness* depthForLight* flickerDecreaseAmount;
        }
    }
}