UIUtility.cs

using UnityEngine;
using UnityEngine.UI;

namespace SC.Utilities
{
    public static class UIUtility
    {
        public static void AddVertFull(this VertexHelper vh, UIVertex vert) => vh.AddVert(vert.position, vert.color, vert.uv0, vert.uv1, vert.uv2, vert.uv3, vert.normal, vert.tangent);

        public static void AddUIVertexQuadFull(this VertexHelper vh, UIVertex[] verts)
        {
            int startIndex = vh.currentVertCount;

            vh.AddVertFull(verts[0]);
            vh.AddVertFull(verts[1]);
            vh.AddVertFull(verts[2]);
            vh.AddVertFull(verts[3]);

            vh.AddTriangle(startIndex, startIndex + 1, startIndex + 2);
            vh.AddTriangle(startIndex + 2, startIndex + 3, startIndex);
        }
    }
}