ilder-class.html">SceneBuilder</a> methods only accepts objects created
by the engine. <a href="dart-ui/SceneBuilder-class.html">SceneBuilder</a> will throw an <a href="dart-core/AssertionError-class.html">AssertionError</a> if you pass it
a custom implementation of this class.</p>
    </section>
    


    <section class="summary offset-anchor inherited" id="instance-properties">
      <h2>Properties</h2>

      <dl class="properties">
        <dt id="hashCode" class="property inherited">
          <span c