Unityで毎フレームmeshを生成するサンプル

Test.cs

using UnityEngine;
using System.Collections;

public class Test : MonoBehaviour {
	private Mesh mesh;
	public Material aMaterial;
	private Vector3[] newVertices;
	private Vector3[] newNormals;
	private Vector2[] newUV;
	private int[] newTriangles;
	
	void Start() {
	}
	
	void Update() {
		if (mesh) {
			Destroy(mesh);
		}
		mesh = new Mesh();
		
		GetComponent<MeshFilter>().mesh = mesh;
		newVertices = new Vector3[3];
		newVertices[0] = new Vector3(-1, 1, 0);
		newVertices[1] = new Vector3(1, 1, 0);
		newVertices[2] = new Vector3(-1, -1, 0);
		mesh.vertices = newVertices;
		
		newNormals = new Vector3[3];
		newNormals[0] = new Vector3(0, 0, 1);
		newNormals[1] = new Vector3(0, 0, 1);
		newNormals[2] = new Vector3(0, 0, 1);
		mesh.normals = newNormals;
		
		newUV = new Vector2[3];
		newUV[0] = new Vector2(0, 1);
		newUV[1] = new Vector2(1, 1);
		newUV[0] = new Vector2(1, 0);
		mesh.uv = newUV;
		
		newTriangles = new int[3];
		newTriangles[0] = 0;
		newTriangles[1] = 1;
		newTriangles[2] = 2;
		mesh.triangles = newTriangles;

		Graphics.DrawMesh(mesh, Vector3.zero, Quaternion.identity, aMaterial, 0);
	}
}