// GameObject -> Quad(Mesh Filter) + Mesh Renderer
using UnityEngine;

public class MeshExample : MonoBehaviour {

  private void Start() {
    Mesh mesh = new Mesh();

    Vector3[] vertices = new Vector3[3];
    Vector2[] uv = new Vector2[3];
    int[] triangles = new int[3];

    vertices[0] = new Vector3(0,0);
    vertices[1] = new Vector3(0,100);
    vertices[2] = new Vector3(100,0);

    uv[0] = new Vector2(0,0);
    uv[1] = new Vector2(0,1);
    uv[2] = new Vector2(1,1);

    // clockwise order
    triangles[0] = 0;
	triangles[1] = 1;
	triangles[2] = 2;

    mesh.vertices = vertices;
    mesh.uv = uv;
    mesh.triangles = triangles;


    GetComponent<MeshFilter>().mesh = mesh;
  }

}