In addition to editing the parameters on each effect at edit time in the Unity Editor, you can also change parameter values at runtime using C# scripting. This page will give you a quick guide to accessing the volume components on your profile and tweaking each parameter.

This asset pack uses URP’s Renderer Features to render each effect, and leverages the URP Volume system, so we will access a given Volume, find the Volume Profile attached to it, and retrieve a specific effect from the profile whose parameters can then be changed as desired.

Here is an example script which accepts a Volume parameter, finds an UnderwaterSettings volume component attached to its Volume Profile, and sets the waveFlowMap, waveFlowSpeed, and causticsScrollVelocity1 parameters.

using UnityEngine;
using UnityEngine.Rendering;

public class ChangeVolumeParametersExample : MonoBehaviour
{
    // This is the Volume which contains the profile we want to modify.
    public Volume volume;

    // These are the desired parameter values, supplied through the Inspector.
    public Texture2D newFlowTexture;
    public float newFlowSpeed;
    public Vector3 newCausticsVelocity;

    private void Start()
    {
        // Get a reference to the UnderwaterSettings. This assumes that the
        // volume has a profile attached.
        UnderwaterSettings underwaterEffect = null;
        if(volume.profile.TryGet(out underwaterEffect))
        {
            // Change parameter values.
            underwaterEffect.waveFlowMap.value = newFlowTexture;
            underwaterEffect.waveFlowSpeed.value = newFlowSpeed;
            underwaterEffect.causticsScrollVelocity1 = newCausticsVelocity;
        }
    }
}