src/drawable/xm.js
/**
   * Animates the xm core
   * @param  {Number} delta Time since last frame
   * @return {Boolean}      Returns true to continue the animation.
   */
Animates the xm core
@param  {Number} delta Time since last frame
@return {Boolean}      Returns true to continue the animation.
Animates the xm core @param { Number } delta Time since last frame @return { Boolean } Returns true to continue the animation .
updateTime(delta) {
    var ret = super.updateTime(delta);
    this.uniforms.u_elapsedTime = ((this.elapsed / 1000) % 300.0) * 0.1;
    return ret;
  }
updateTime ( delta ) { var ret = super . updateTime ( delta ) ; this . uniforms . u_elapsedTime = ( ( this . elapsed / 1000 ) % 300.0 ) * 0.1 ; return ret ; }
Animates the xm core
 @param  {Number} delta Time since last frame
 @return {Boolean}      Returns true to continue the animation.
Animates the xm core @param { Number } delta Time since last frame @return { Boolean } Returns true to continue the animation .