Animated Sprites

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var uvAnimationTileX = 4;
var uvAnimationTileY = 4;
var framesPerSecond = 10.0;

function Update () {

    // Calculate index
    var index : int = Time.time * framesPerSecond;

    // repeat when exhausting all frames
    index = index % (3 * 1);

    // Size of every tile
    var size = Vector2 (1.0 / uvAnimationTileX, 1.0 / uvAnimationTileY);

    // split into horizontal and vertical index
    var uIndex = index % uvAnimationTileX;
        var vIndex = index / uvAnimationTileX;

    // build offset
    // v coordinate is the bottom of the image in opengl so we need to invert.
    var offset = Vector2 (uIndex * size.x, 1.0 - size.y - vIndex * size.y);

        renderer.material.SetTextureOffset ("_MainTex", offset);
        renderer.material.SetTextureScale ("_MainTex", size);
}