code: function(){
      var gl = this.gl;
      gl.deleteFramebuffer( this.fbo );
      
      for (var i = 0; i < this.attachmentsList.length; i++) {
        this.attachmentsList[i].dispose();
      }
      this.attachmentsList = null;
      this.attachments     = null;
  
      this.valid = false;
      this.fbo   = null;
      this.gl    = null;
    }
docs: Delete all webgl objects related to this Fbo (fbo, and all attachments )