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;
 }
}