src/drawable/particle-portal.js
/**
   * Update the time for the system
   * @param  {Number} delta Time since last tick
   * @return {Boolean}      Results of onUpdate
   */
Update the time for the system
@param  {Number} delta Time since last tick
@return {Boolean}      Results of onUpdate
Update the time for the system @param { Number } delta Time since last tick @return { Boolean } Results of onUpdate
updateTime(delta) {
    let ret = super.updateTime(delta);
    this.uniforms.u_params[0] = (this.elapsed / 100000) * this.uniforms.u_params[1];
    return ret;
  }
updateTime ( delta ) { let ret = super . updateTime ( delta ) ; this . uniforms . u_params [ 0 ] = ( this . elapsed / 100000 ) * this . uniforms . u_params [ 1 ] ; return ret ; }
Update the time for the system
 @param  {Number} delta Time since last tick
 @return {Boolean}      Results of onUpdate
Update the time for the system @param { Number } delta Time since last tick @return { Boolean } Results of onUpdate