RiverStencilCopy

using sc.modeling.river.runtime;
using UnityEngine;

[ExecuteAlways]
//Mirrors a RiverModeler component, but with an altered height offset and added width
public class RiverStencilCopy : MonoBehaviour
{
    public RiverModeler source;
    public RiverModeler destination;

    public float offset;
    public float width;

    private void Reset()
    {
        destination = GetComponent<RiverModeler>();
    }

    private void OnEnable()
    {
        RiverModeler.onPostRebuildRiver += OnPostRebuild;
    }

    private void OnDisable()
    {
        RiverModeler.onPostRebuildRiver -= OnPostRebuild;
    }

    private void OnPostRebuild(RiverModeler instance, RiverModeler.ChangeFlags updateflags)
    {
        if (instance != source) return;

        Rebuild(updateflags);
    }

    private void Rebuild(RiverModeler.ChangeFlags updateflags)
    {
        if (source == null || destination == null) return;

        destination.settings = source.settings;

        float prevOffset = destination.settings.shape.offset.y;
        float prevWidth = destination.settings.shape.width;
        destination.settings.shape.offset.y = offset;
        destination.settings.shape.width += width;

        destination.Rebuild(updateflags);

        //Reset
        destination.settings.shape.offset.y = prevOffset;
        destination.settings.shape.width = prevWidth;
    }
}