performance - 在three.js中提高动画 Sprite 的性能

Question

目前，我正在开发在线游戏，出于性能考虑，我决定使用webgl而不是HTML5的 Canvas 。我正在使用three.js框架，我的意图是拥有移动的动画 Sprite 。 Sprite 本身放置在 Sprite 板上，我使用UVOffset和UVScale来使用正确的图片，并在经过时切换 Sprite 的图片。我想知道是否有一种方法可以提高这段代码的性能，因为现在它同时开始在场上约300个“玩家”的位置上放慢速度。

问候

以下是我的代码中最重要的部分:

var image = THREE.ImageUtils.loadTexture( "img/idlew.png" );

  function addPlayer(){
    var mesh = new THREE.Sprite({map:image});//, affectedByDistance: false, useScreenCoordinates: false});
    images.push(mesh);
    mesh.position.set(Math.floor(Math.random() * 500), Math.floor(Math.random() * 500), 10);
    scene.add(mesh);
    mesh.uvScale.x = 96/1152;
    mesh.scale.x = 0.1;
    mesh.scale.y = 0.1;
  }


var imgBackground  = new THREE.MeshLambertMaterial({
      map:THREE.ImageUtils.loadTexture('img/grass.jpg')
  });


   var background = new THREE.Mesh(new THREE.PlaneGeometry(1000, 1000),imgBackground);


  scene.add(background);



  scene.add(camera);
camera.rotation.x = -(Math.PI/2);
scene.add(new THREE.AmbientLight(0xFFFFFF));

addPlayer();

  renderer.render(scene, camera);
  var moveUp = false;
  tick();
  var ticker = 0;
  var usedOne = 0;

  function tick(){
    ticker++;
    if(ticker%10==0){
      for (var i = 0; i < images.length; i++) {
        images[i].uvOffset.x = usedOne * 0.0835;
      };
        usedOne++;
        if(usedOne == 12) usedOne = 0;
        addPlayer();
        addPlayer();
        addPlayer();
        console.log(images.length);
    }
    requestAnimationFrame( tick );

      renderer.render(scene, camera);
  }

Answer 1

我已经编写了一个显示动画纹理的代码示例，并在以下位置提供了实时示例:

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

来源可在以下位置获得:

http://github.com/stemkoski/stemkoski.github.com/blob/master/Three.js/Texture-Animation.html

有用的部分是我编写的用于自动处理偏移量的函数。该函数(从上面的链接中提取)如下:

function TextureAnimator(texture, tilesHoriz, tilesVert, numTiles, tileDispDuration) 
{   
    // note: texture passed by reference, will be updated by the update function.

    this.tilesHorizontal = tilesHoriz;
    this.tilesVertical = tilesVert;

    // how many images does this spritesheet contain?
    //  usually equals tilesHoriz * tilesVert, but not necessarily,
    //  if there at blank tiles at the bottom of the spritesheet. 
    this.numberOfTiles = numTiles;
    texture.wrapS = texture.wrapT = THREE.RepeatWrapping; 
    texture.repeat.set( 1 / this.tilesHorizontal, 1 / this.tilesVertical );

    // how long should each image be displayed?
    this.tileDisplayDuration = tileDispDuration;

    // how long has the current image been displayed?
    this.currentDisplayTime = 0;

    // which image is currently being displayed?
    this.currentTile = 0;

    this.update = function( milliSec )
    {
        this.currentDisplayTime += milliSec;
        while (this.currentDisplayTime > this.tileDisplayDuration)
        {
            this.currentDisplayTime -= this.tileDisplayDuration;
            this.currentTile++;
            if (this.currentTile == this.numberOfTiles)
                this.currentTile = 0;
            var currentColumn = this.currentTile % this.tilesHorizontal;
            texture.offset.x = currentColumn / this.tilesHorizontal;
            var currentRow = Math.floor( this.currentTile / this.tilesHorizontal );
            texture.offset.y = currentRow / this.tilesVertical;
        }
    };
}       

您可以使用(例如)初始化 Material :

var runnerTexture = new THREE.ImageUtils.loadTexture( 'images/run.png' );
// a texture with 10 frames arranged horizontally, display each for 75 millisec
annie = new TextureAnimator( runnerTexture, 10, 1, 10, 75 ); 
var runnerMaterial = new THREE.MeshBasicMaterial( { map: runnerTexture } );

并在每次渲染之前使用以下命令对其进行更新:

var delta = clock.getDelta(); 
annie.update(1000 * delta);

希望这可以帮助!