title: How to set the level of detail / smoothness / subdivision rate for SCNShape?
body: <p>I am currently trying to render a circle with SCNShapeNode in SceneKit. But unfortunately it does not render a perfect circle but an octagon.</p>
  
  <p>Is there any way to set the render detail for SCNShape?   </p>
  
  <pre><code>UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter: CGPointMake(0, 0) radius: 2 startAngle: 0.0 endAngle: M_PI * 2.0f clockwise: NO];
  
  SCNShape *shape = [SCNShape shapeWithPath:path extrusionDepth: 1.0];
  shape.firstMaterial.diffuse.contents = [UIColor colorWithRed: 1.0 green:0.0 blue:0.0 alpha:1.0];    
  
  SCNNode *shapeNode = [SCNNode nodeWithGeometry: shape];
  [scene.rootNode addChildNode: shapeNode];
  </code></pre>