Spritesheet generator for Unity3D

/* **************************************************************************
    Author:Leonardo Lopes (http://about.me/leonardo_lopes)

    SpriteSheet animation generator.

    Version 1.0.0

************************************************************************** */

using UnityEngine;
using System.Collections;

/* **************************************************************************
 * This script automatically builds an animation based on a sprite sheet texture.
 * To use it, configure it's public parameters, then right-click in the component and click Build
 * ***************************************************************************/

[RequireComponent (typeof(Animation))]
public class SpriteSheet : MonoBehaviour {
    public float fps = 12.0f;
    public int rows = 3;
    public int columns = 3;
    public int missingFrames = 0;
    public WrapMode wrapMode = WrapMode.Loop;

    // Use this for initialization
    void Start () {
    }

    // Update is called once per frame
    void Update () {

    }

    /// <summary>
    /// Builds the animation.
    /// </summary>
    [ContextMenu ("Build")]
    void Build(){
        this.renderer.sharedMaterial.mainTextureScale = new Vector2(1.0f / this.columns, 1.0f / this.rows);
        this.renderer.sharedMaterial.mainTextureOffset = new Vector2(0.0f, 1.0f - (1.0f / this.rows));

        this.animation.clip = null;

        AnimationClip clip = new AnimationClip();

        //Offset curves
        AnimationCurve xOffsetCurve = new AnimationCurve();
        AnimationCurve yOffsetCurve = new AnimationCurve();

        int keyCount = 0;
        for(int j = 0; j < rows; j++){
            Keyframe yKey = new Keyframe(
                (1.0f / this.fps) * keyCount,       //time
                1.0f - ((1.0f / this.rows) * (j+1)),    //value
                Mathf.Infinity,                     //inTangent
                0                                   //outTangent
                );

            yOffsetCurve.AddKey(yKey);

            for(int i = 1; i <= columns; i++){
                Keyframe xKey = new Keyframe(
                    (1.0f / this.fps) * keyCount,       //time
                    (1.0f / this.columns) * (i - 1),    //value
                    Mathf.Infinity,                     //inTangent
                    0                                   //outTangent
                    );

                xOffsetCurve.AddKey(xKey);

                keyCount++;

                //Exclude keyframes because we don't have frames in the texture.
                if((keyCount) > (rows * columns) - this.missingFrames){
                    break;
                }
            }

            //Exclude keyframes because we don't have frames in the texture.
            if((keyCount) > (rows * columns) - this.missingFrames){
                break;
            }
        }

        clip.SetCurve("", typeof(Material), "_MainTex.offset.x", xOffsetCurve);
        clip.SetCurve("", typeof(Material), "_MainTex.offset.y", yOffsetCurve);

        clip.name = "Animation";
        clip.wrapMode = this.wrapMode;

        if(animation[clip.name] != null)
            animation.RemoveClip("Animation");
        animation.AddClip(clip, clip.name);
        animation.clip = clip;
        animation.wrapMode = this.wrapMode;
    }
}