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Showing content from https://docs.unity3d.com/Packages/com.unity.ugui@1.0/api/UnityEngine.UI.VertexHelper.html below:

A utility class that can aid in the generation of meshes for the UI.

public class VertexHelper : IDisposable

using UnityEngine;
using UnityEngine.UI;

public class ExampleClass : MonoBehaviour
{
    Mesh m;

    void Start()
    {
        Color32 color32 = Color.red;
        using (var vh = new VertexHelper())
        {
            vh.AddVert(new Vector3(0, 0), color32, new Vector2(0f, 0f));
            vh.AddVert(new Vector3(0, 100), color32, new Vector2(0f, 1f));
            vh.AddVert(new Vector3(100, 100), color32, new Vector2(1f, 1f));
            vh.AddVert(new Vector3(100, 0), color32, new Vector2(1f, 0f));

            vh.AddTriangle(0, 1, 2);
            vh.AddTriangle(2, 3, 0);
            vh.FillMesh(m);
        }
    }
}

public VertexHelper(Mesh m)

Get the number of indices set on the VertexHelper.

public int currentIndexCount { get; }

Current number of vertices in the buffer.

public int currentVertCount { get; }

Add a triangle to the buffer.

public void AddTriangle(int idx0, int idx1, int idx2)

index 0

index 1

index 2

Add a quad to the stream.

public void AddUIVertexQuad(UIVertex[] verts)

4 Vertices representing the quad.

Add a stream of custom UIVertex and corresponding indices.

public void AddUIVertexStream(List<UIVertex> verts, List<int> indices)

The custom stream of verts to add to the helpers internal data.

The custom stream of indices to add to the helpers internal data.

Add a list of triangles to the stream.

public void AddUIVertexTriangleStream(List<UIVertex> verts)

Vertices to add. Length should be divisible by 3.

Add a single vertex to the stream.

public void AddVert(UIVertex v)

The vertex to add

Add a single vertex to the stream.

public void AddVert(Vector3 position, Color32 color, Vector4 uv0)

Position of the vert

Color of the vert

UV of the vert

Add a single vertex to the stream.

public void AddVert(Vector3 position, Color32 color, Vector4 uv0, Vector4 uv1, Vector3 normal, Vector4 tangent)

Position of the vert

Color of the vert

UV of the vert

UV1 of the vert

Normal of the vert.

Tangent of the vert

Add a single vertex to the stream.

public void AddVert(Vector3 position, Color32 color, Vector4 uv0, Vector4 uv1, Vector4 uv2, Vector4 uv3, Vector3 normal, Vector4 tangent)

Clear all vertices from the stream.

Cleanup allocated memory.

Fill the given mesh with the stream data.

public void FillMesh(Mesh mesh)

Create a stream of UI vertex (in triangles) from the stream.

public void GetUIVertexStream(List<UIVertex> stream)

Fill a UIVertex with data from index i of the stream.

public void PopulateUIVertex(ref UIVertex vertex, int i)

Vertex to populate

Index to populate.

Set a UIVertex at the given index.

public void SetUIVertex(UIVertex vertex, int i)

The vertex to fill

the position in the current list to fill.

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