unity如何动态控制后处理程序的参数

public PostProcessVolume volume;
		public DepthOfField dof;

		// Use this for initialization
		void Start()
		{
			PostProcessLayer ppsLayer = GetComponent<PostProcessLayer>();
			if (ppsLayer != null)
			{
				LayerMask layerMask = ppsLayer.volumeLayer;
				PostProcessVolume[] ppsVolumes = FindObjectsOfType<PostProcessVolume>();
				if (ppsVolumes != null && ppsVolumes.Length > 0)
				{
					for (int k = 0; k < ppsVolumes.Length; k++)
					{
						PostProcessVolume ppsVolume = ppsVolumes[k];
						int layer = 1 << ppsVolume.gameObject.layer;
						bool inLayer = (layerMask.value & layer) == layer;
						if (ppsVolume != null && inLayer && ppsVolume.profile != null && ppsVolume.profile.TryGetSettings<DepthOfField>(out dof))
						{
							volume = ppsVolume;
							break;
						}
					}
				}
			}
			if (dof == null)
			{
				Debug.LogError("找不到景深");
			}

			 
		}

using UnityEngine.Rendering.PostProcessing;

引入后处理的命名空间，先获取PostProcessVolume对象，从PostProcessVolume中尝试获取对应的后处理脚本对象，并修改参数