text: function Particle() {
      //   var acc, pos, frc;
      this.radius = 500;
      //   this.theta = Math.PI * Math.random() - Math.PI / 2;
      //   this.phi = 2 * Math.PI * Math.random();
      //   this.x = Math.cos(this.theta) * Math.cos(this.phi) * this.radius;
      //   this.y = Math.sin(this.theta) * this.radius;
      //   this.z = Math.sin(this.phi) * Math.cos(this.theta) * this.radius;
      this.x = this.radius * Math.random() - this.radius / 2;
      this.y = this.radius * Math.random() - this.radius / 2;
      this.z = this.radius * Math.random() - this.radius / 2
  
      this.temp = new THREE.Vector3(this.x, this.y, this.z);
  
      if (this.temp.length() < this.radius/2) {
  
          this.pos = new THREE.Vector3(this.x, this.y, this.z);
      } else {
  
          this.pos = new THREE.Vector3(this.x / 10, this.y / 10, this.z / 10);
      }
  
  
  
      //  this.pos = new THREE.Vector3(0, 0, 0);
      this.vel = new THREE.Vector3(0, 0, 0);
      this.acc = new THREE.Vector3(0, 0, 0);
      this.update = function() {
          this.vel.addVectors(this.vel, this.acc);
          this.pos.addVectors(this.pos, this.vel);
          this.acc.multiplyScalar(0);
      }
  }
  module.exports = Particle;