makeMesh.js

#pragma strict

// Script that creates a Unity mesh with 2 triangles, with per-vertex colors
// Note that this requires the vertexColor shader (https://gist.github.com/davepape/6b74369986ff6324c47a)
// to also be in your project's assets

function Start () {
	gameObject.AddComponent(MeshFilter);
	gameObject.AddComponent(MeshRenderer);
	GetComponent(Renderer).material = new Material(Shader.Find("Custom/Vertex Colored"));
	var m = GetComponent(MeshFilter).mesh;
	m.vertices = [ Vector3(-2,-2,0), Vector3(0,2,0), Vector3(2,-2,0), Vector3(0,-4,0)];
	m.colors = [ Color(1,0,0), Color(0,1,0), Color(0,0,1), Color(1,1,1)];
	m.triangles = [ 0, 1, 2, 0, 2, 3 ];
}

function Update () {
	var m = GetComponent(MeshFilter).mesh;
	var v = m.vertices;
	v[0][0] = -2 + Mathf.Sin(Time.time);
	m.vertices = v;
}