The code in Unity HDRP dynamically modifies the skybox and other environment parameters

方法一

直接在AssetsCreate a new one under the resource folderVolume Profile,Then add components to it.

The components areVisual Environment和HDRI Sky.
注意：VolumeComponent properties must have the checkmark in front of them checked,to be modified.
Then configure it as shown below：（HdriSkyThe property needs to be assigned a value of oneCubemap资源,That is the skybox you want to replace）

最后利用c#The code implements the replacement of the environment material,It also realizes the replacement of the skybox.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Rendering;

public Volume skybox;//Gets the environment volume controls in the scene
public VolumeProfile NewVolumeProfile;//自己新建的VolumeProfile资源

public class Test : MonoBehaviour
{
    
	void Start()
	{
    
	skybox.profile = NewVolumeProfile;//替换
	}
}

方法二

Modify the current scene directlyvolumeAmbient property of the component under the control;

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.HighDefinition;

public class Test0: MonoBehaviour
{
    
  public Volume skybox;//Gets the environment volume controls in the scene
  public Cubemap cubemap;//The skybox needs to be replaced
  void Start()
    {
    
	       if (skybox.sharedProfile.TryGet<HDRISky>(out var Temp0))
	        {
    
	            Temp0.hdriSky.overrideState = true;//overrideState的值就是VolumeThe component property of its previous check state
	            Temp0.hdriSky.value = cubemap;
	
	        }
    }

}
       

当然,Using the above method can not only modify the skybox.还能修改exposure（曝光）值,fog（雾）等等;
具体可参考：
UnityOfficial environment volume introduction