Unity PostFX Profile Blending

PostFXBlend.cs

using UnityEngine;
using UnityEngine.Rendering.PostProcessing;
using System.Collections;

public abstract class PostFXBlend : MonoBehaviour
{
  public float FadeInTime = 1.0f;
  public float FadeOutTime = 1.0f;
  public float BlendWeightDebug;

  public float BlendWeight
  {
    get { return _volume.weight; }
    set { _volume.weight = value; BlendWeightDebug = value; }
  }

  private PostProcessVolume _volume = null;
  private PostProcessEffectSettings[] _effect = null;

  protected virtual PostProcessEffectSettings[] CreateEffect()
  {
    return null;
  }

  private void OnEnable()
  {
    ResetEffect();
  }

  private void OnDisable()
  {
    if (_volume != null)
    {
      RuntimeUtilities.DestroyVolume(_volume, false);
      _volume = null;
    }
  }

  public void ResetEffect()
  {
    _effect = CreateEffect();
    if (_effect != null)
    {
      if (_volume != null)
      {
        RuntimeUtilities.DestroyVolume(_volume, false);
      }

      _volume = PostProcessManager.instance.QuickVolume(gameObject.layer, 100f, _effect);
      _volume.weight = 0;
      _volume.isGlobal = true;
    }
  }

  public Coroutine FadeIn()
  {
    return StartCoroutine(FadeInRoutine());
  }

  public Coroutine FadeOut()
  {
    return StartCoroutine(FadeOutRoutine());
  }

  private IEnumerator FadeInRoutine()
  {
    while (_volume == null)
    {
      yield return null;
    }

    for (float time = 0; time < FadeInTime; time += Time.deltaTime)
    {
      _volume.weight = time / FadeInTime;
      yield return null;
    }

    _volume.weight = 1.0f;
  }

  private IEnumerator FadeOutRoutine()
  {
    for (float time = 0; time < FadeOutTime; time += Time.deltaTime)
    {
      _volume.weight = Mathf.Lerp(1.0f, 0.0f, time / FadeOutTime);
      yield return null;
    }

    _volume.weight = 0.0f;
    Destroy(gameObject);
  }
}

PostFXBlendAsset.cs

using UnityEngine;
using UnityEngine.Rendering.PostProcessing;

public class PostFXBlendAsset : PostFXBlend
{
  public PostProcessEffectSettings[] EffectSettings;

  protected override PostProcessEffectSettings[] CreateEffect()
  {
    return EffectSettings;
  }
}