// Sets the vertex color to be red at the y=0 and green at y=1.
// (Note that most builtin shaders don't display vertex colors, you can
// use eg. a particle shader to see vertex colors)

function Start () {
    var mesh : Mesh = GetComponent(MeshFilter).mesh;
    var vertices : Vector3[] = mesh.vertices;
    var colors : Color[] = new Color[vertices.Length];

    for (var i = 0; i < vertices.Length;i++)
        colors[i] = Color.Lerp(Color.red, Color.green, vertices[i].y);

    mesh.colors = colors;
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Start() {
        Mesh mesh = GetComponent<MeshFilter>().mesh;
        Vector3[] vertices = mesh.vertices;
        Color[] colors = new Color[vertices.Length];
        int i = 0;
        while (i < vertices.Length) {
            colors[i] = Color.Lerp(Color.red, Color.green, vertices[i].y);
            i++;
        }
        mesh.colors = colors;
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Start():
        mesh as Mesh = GetComponent[of MeshFilter]().mesh
        vertices as (Vector3) = mesh.vertices
        colors as (Color) = array[of Color](vertices.Length)
        i as int = 0
        while i < vertices.Length:
            colors[i] = Color.Lerp(Color.red, Color.green, vertices[i].y)
            i++
        mesh.colors = colors