Function callback

src/jscad/processor.js:481–499

(err, objects)

    this.state = 1 // processing
    let that = this
    function callback (err, objects) {
      if (err) {
        that.clearViewer()

        if (err.stack) {
          let errtxt = ''
          errtxt += '\nStack trace:\n' + err.stack
        //    var errtxt = err.toString()
        }
        that.setStatus('error', err)// 'Error.'
        that.state = 3 // incomplete

      } else {
        that.setCurrentObjects(objects)
        that.setStatus('ready')
        that.state = 2 // complete
      }
      that.enableItems()
    }

    if (this.opts.useAsync) {
      this.builder = rebuildSolidInWorker(script, fullurl, parameters, (err, objects) => {