function Particle()
    {
    
          var loader=new THREE.JSONLoader();
          loader.load('http://xxxxx:8000/asset/female02/Female02_slim.json',function(geometry,materials)
          {
                var material = new THREE.PointsMaterial({
                 color: 0xffffff,
                 size: 0.4,
                 opacity: 0.6,
                 transparent: true,
                 blending: THREE.AdditiveBlending,
                 depthTest: false,
                 map: generateTextureByCanvas()
             });            var mesh = new THREE.Points(geometry, material);
             
             mesh.rotation.x = -0.5 * Math.PI; 
             mesh.scale.set(0.2, 0.2, 0.2); 
             
             geometry.center(); //居中 不知道为啥好像必须要这个东西
              mesh.position.y+=50;
             scene.add(mesh);
          }
          );
    
    }function generateTextureByCanvas() {
        var canvas = document.createElement('canvas');
         canvas.width = 16;
         canvas.height = 16;        var context = canvas.getContext('2d');上下文
     var gradient = context.createRadialGradient(canvas.width / 2, canvas.height / 2, 0, canvas.width / 2, canvas.height / 2, canvas.width / 2);渐变色 内圆xyr外圆xyr
         gradient.addColorStop(0, 'rgba(255,255,255,1)');
         gradient.addColorStop(0.2, 'rgba(0,255,255,1)');
         gradient.addColorStop(0.4, 'rgba(0,0,64,1)');
         gradient.addColorStop(1, 'rgba(0,0,0,1)');        context.fillStyle = gradient;
         context.fillRect(0, 0, canvas.width, canvas.height);        var texture = new THREE.Texture(canvas);
         texture.needsUpdate = true;
         return texture;    }