Mesh.colors

var colors : Color[]

Description

Vertex colors of the mesh.

If no vertex colors are available an empty array will be returned.

JavaScript
// 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;
}

For performance reasons, consider using colors32 instead. This will avoid byte-to-float conversions in colors, as well as use less temporary memory.