使用SCNShape和UIBezierPath绘制弧

Question

我正在尝试使用以下代码在SCNShape中绘制一块馅饼：

UIBezierPath *piePiece = [UIBezierPath bezierPath];
[piePiece addArcWithCenter: CGPointZero radius:  0.150 startAngle: 0.0 endAngle: M_PI/6  clockwise: YES];
[piePiece closePath];
SCNShape *pieShape = [SCNShape shapeWithPath: piePiece extrusionDepth: 0];
pieShape.firstMaterial.diffuse.contents = [UIColor blueColor];
pieShape.firstMaterial.doubleSided = YES;
SCNNode *pieNode = [SCNNode nodeWithGeometry: pieShape];

但我得到以下形状：

Sample 我看不到弧线。我做错了什么？

由于

Answer 1

必须将UIBezierPath的平坦度更改为较低的值。在Swift中：

pieShape.flatness = 0.0003