Controlling post processing effects using scripts

PostProcessingManager.cs

using UnityEngine.Rendering.PostProcessing;

public PostProcessVolume pVolume;
public Slider occSlider;

public class PostProcessingManager : MonoBehaviour
{

    private void SetPostProcessing()
    {
        if(pVolume.profile.TryGetSettings<AmbientOcclusion>(out var occ))
        {
            occ.intensity.overrideState = true;
            occ.intensity.value = new FloatParameter { value = 3f };
            
            // slider
            //occ.intensity.value = new FloatParameter { value = occSlider.value }; 
        }
    }

}