Unity3D研究院之给UI添加Mesh形状（一百二十）

using UnityEngine;
using UnityEngine.UI;

[RequireComponent(typeof(CanvasRenderer))]
public class MeshImage : MaskableGraphic 
{
	public Vector3 overridePostion;
	public Vector3 overrideRotation;
	public Vector3 overrideScale = new Vector3(100f, 100f, 100f);
	public Texture texture;
	public Mesh mesh;


	public override Texture mainTexture
	{
		get { return texture; }
	}

    protected override void OnPopulateMesh(VertexHelper vh)
	{
		if (mesh != null)
		{
			vh.Clear();
            //提取Mesh信息
			int[] triangles = mesh.triangles;
			Vector3[] vertices = mesh.vertices;
			Vector3[] normals = mesh.normals;
			Vector2[] UVs = mesh.uv;
            //处理缩放矩阵
			Matrix4x4 matrix4X4 = Matrix4x4.identity;
			matrix4X4.m00 = overrideScale.x;
			matrix4X4.m11 = overrideScale.y;
			matrix4X4.m22 = overrideScale.z;

			for (int i = 0; i < vertices.Length; i++)
			{
                //组合UI顶点信息
				UIVertex temp = new UIVertex();
				temp.position = matrix4X4.MultiplyPoint3x4((Quaternion.Euler(overrideRotation) * vertices[i]) + overridePostion);
				temp.uv0 = UVs[i];
				temp.normal = normals[i];
				temp.color = (Color32)color;
				vh.AddVert(temp);
			}

            //设置三角形索引
			for (int i = 0; i < triangles.Length; i += 3)
			{
				vh.AddTriangle(triangles[i], triangles[i + 1], triangles[i + 2]);
			}
		}
	}

    //只有编辑器才会执行
    //修改面板属性重新刷新
	protected override void OnValidate()
	{
		base.OnValidate();
		SetMaterialDirty();
		SetVerticesDirty();
	}
}