Three.js Using 2D texturesprite for animation (planeGeometry)

I’m quite new in html5 and three.js. I’ve been experimenting a bit with it, and basically what I want done is to have a Mesh (I’m using planeGeometry, as the tutorial I followed used it). The Mesh shows different Textures, which can change later on.

Here’s what my code looks like:

angelTexture = THREE.ImageUtils.loadTexture("images/textures/chars/angel/angel.png");
angelTexture.offset.x = -0.75;
angelTexture.offset.y = -0.75;

angelMesh = new THREE.Mesh( new THREE.PlaneGeometry(79, 53, 79, 53), new THREE.MeshBasicMaterial( { map: angelTexture, wireframe: false } ));

angelMesh.position.x = 0;
angelMesh.position.y = 0;
scene.add(angelMesh);

The problem is that whenever I offset, the Mesh seems big enough to show all the other Sprites (I’m using the texture as a 2D Sprite that I offset to animate it). The result is quite disastrous and I am still figuring out how to control how big the Mesh is so that it shows only one snapshot of the Sprite. All my attempts seem only to resize the Mesh as well as the underlying Texture and still shows all the Sprites.

Can someone point me in the right direction? Thanks in advance.

…

My friend came up with a solution… I missed the repeat property.

angelTexture = THREE.ImageUtils.loadTexture("images/textures/chars/angel/angel.png");
angelTexture.offset.x = -0.75; 
angelTexture.offset.y = -0.75;

angelTexture.repeat.x = 0.25;
angelTexture.repeat.y = 0.25;   
scene.add(angelMesh);

Hope this helps others having the same problem.

Answer

I had the same question a while ago, and so I have written up a complete example of animating using a spritesheet as the texture for a PlaneGeometry, and then updating the texture at regular intervals — check out the example at

http://stemkoski.github.io/Three.js/Texture-Animation.html

and view the commented source code for additional explanation.

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Update (2021):

Here is an updated version of the function I recommend using. It fixes the issue with the incorrect tile display order, it automatically updates the next frame, and it returns an object you can use to stop and re-start the animation as desired.

function TextureAnimator(texture, tilesHoriz, tilesVert, tileDispDuration) 
{ 
  let obj = {};

  obj.texture = texture;
  obj.tilesHorizontal = tilesHoriz;
  obj.tilesVertical = tilesVert;
  obj.tileDisplayDuration = tileDispDuration;

  obj.numberOfTiles = tilesHoriz * tilesVert;

  obj.texture.wrapS = THREE.RepeatWrapping;   
  obj.texture.wrapT = THREE.RepeatWrapping;   
  obj.texture.repeat.set( 1/tilesHoriz, 1/tilesVert );
  obj.currentTile = 0;

  obj.nextFrame = function()
  {
    obj.currentTile++;
    if (obj.currentTile == obj.numberOfTiles)
      obj.currentTile = 0;

    let currentColumn = obj.currentTile % obj.tilesHorizontal;
    obj.texture.offset.x = currentColumn / obj.tilesHorizontal;

    let currentRow = Math.floor( obj.currentTile / obj.tilesHorizontal );
    obj.texture.offset.y = obj.tilesVertical - currentRow / obj.tilesVertical;
  }

  obj.start = function()
  { obj.intervalID = setInterval(obj.nextFrame, obj.tileDisplayDuration); }

  obj.stop = function()
  { clearInterval(obj.intervalID); }

  obj.start();
  return obj;
}