Animating Tiled texture

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Revision as of 00:28, 20 July 2012 by Julien (Talk | contribs)

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Author: Joachim Ante

Contents

Description

This script animates a texture containing tiles of an animation. You can give it a framerate to determine the speed of the animation and set how many tiles on x, y there are.

Usage

Attach this script to the object that has a material with the tiled texture. To avoid distortion, the proportions of the object must be the same as the proportions of each tile (eg 1:2 for the sheet below).

Here is an example of how to lay out a texture for it (Thanks to BigBrainz for providing it): Torchanimation 135.png

(Leo Nogueira) Adding a simple image with multiple rows for testing purposes and a modified version of the C# Script:
TilesTestPNG.png

JavaScript - AnimatedTextureUV.js

var uvAnimationTileX = 24; //Here you can place the number of columns of your sheet. 
                           //The above sheet has 24
 
var uvAnimationTileY = 1; //Here you can place the number of rows of your sheet. 
                          //The above sheet has 1
var framesPerSecond = 10.0;
 
function Update () {
 
	// Calculate index
	var index : int = Time.time * framesPerSecond;
	// repeat when exhausting all frames
	index = index % (uvAnimationTileX * uvAnimationTileY);
 
	// 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);
}

CSharp - SpritSheet.cs

This is just a CSharp version of the AnimatedTextureUV.js above.

public class SpriteSheet : MonoBehaviour 
{
	public int _uvTieX = 1;
	public int _uvTieY = 1;
	public int _fps = 10;
 
	private Vector2 _size;
	private Renderer _myRenderer;
	private int _lastIndex = -1;
 
	void Start () 
	{
		_size = new Vector2 (1.0f / _uvTieX , 1.0f / _uvTieY);
		_myRenderer = renderer;
		if(_myRenderer == null)
			enabled = false;
	}
	// Update is called once per frame
	void Update()
	{
		// Calculate index
		int index = (int)(Time.timeSinceLevelLoad * _fps) % (_uvTieX * _uvTieY);
    	if(index != _lastIndex)
		{
			// split into horizontal and vertical index
			int uIndex = index % _uvTieX;
			int vIndex = index / _uvTieY;
 
			// build offset
			// v coordinate is the bottom of the image in opengl so we need to invert.
			Vector2 offset = new Vector2 (uIndex * _size.x, 1.0f - _size.y - vIndex * _size.y);
 
			_myRenderer.material.SetTextureOffset ("_MainTex", offset);
			_myRenderer.material.SetTextureScale ("_MainTex", _size);
 
			_lastIndex = index;
		}
	}
}

CSharp - SpritSheetNG.cs

The CSharp version of the script was not working with multiple rows so i made some changes.

public class SpriteSheetNG : MonoBehaviour
{	
    private float iX=0;
    private float iY=1;
    public int _uvTieX = 1;
    public int _uvTieY = 1;
    public int _fps = 10;
    private Vector2 _size;
    private Renderer _myRenderer;
    private int _lastIndex = -1;
 
    void Start ()
    {
        _size = new Vector2 (1.0f / _uvTieX ,
                             1.0f / _uvTieY);
 
        _myRenderer = renderer;
 
        if(_myRenderer == null) enabled = false;
 
        _myRenderer.material.SetTextureScale ("_MainTex", _size);
    }
 
 
 
    void Update()
    {
        int index = (int)(Time.timeSinceLevelLoad * _fps) % (_uvTieX * _uvTieY);
 
        if(index != _lastIndex)
        {
            Vector2 offset = new Vector2(iX*_size.x,
                                         1-(_size.y*iY));
            iX++;
            if(iX / _uvTieX == 1)
            {
                if(_uvTieY!=1)    iY++;
                iX=0;
                if(iY / _uvTieY == 1)
                {
                    iY=1;
                }
            }
 
            _myRenderer.material.SetTextureOffset ("_MainTex", offset);
 
 
            _lastIndex = index;
        }
    }
}

CSharp - AnimateTiledTexture

A version using coroutines. Slightly faster since it doesn't update every frame and only sets the texture scale once.

using UnityEngine;
using System.Collections;
 
class AnimateTiledTexture : MonoBehaviour
{
    public int columns = 2;
    public int rows = 2;
    public float framesPerSecond = 10f;
 
    //the current frame to display
    private int index = 0;
 
    void Start()
    {
        StartCoroutine(updateTiling());
 
        //set the tile size of the texture (in UV units), based on the rows and columns
        Vector2 size = new Vector2(1f / columns, 1f / rows);
        renderer.sharedMaterial.SetTextureScale("_MainTex", size);
    }
 
    private IEnumerator updateTiling()
    {
        while (true)
        {
            //move to the next index
            index++;
            if (index >= rows * columns)
                index = 0;
 
            //split into x and y indexes
            Vector2 offset = new Vector2(index / columns - (index / columns), //x index
                                          (index / columns) / rows);          //y index
 
            renderer.sharedMaterial.SetTextureOffset("_MainTex", offset);
 
            yield return new WaitForSeconds(1f / framesPerSecond);
        }
 
    }
}
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