ARKit概念解析二：SCNText的extrusionDepth与chamferRadius

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一个文本几何体可能包含一个，三个或五个几何体元素：

A text geometry may contain one, three, or five geometry elements:

如果它的extrusionDepth属性是0.0，文本几何体有一个元素对应它的可见面。

If its extrusionDepth property is 0.0, the text geometry has one element corresponding to its one visible side.

如果它的挤压深度(extrusionDepth)大于0，它的倒角半径(chamferRadius)属性是0.0，文本几何体有三个元素，对应它的前，后和受挤压的面。

If its extrusion depth is greater than zero and its chamferRadius property is 0.0, the text geometry has three elements, corresponding to its front, back, and extruded sides.

如果挤压深度和倒角半径都大于0，文本几何体有五个元素，对应它的前，后，受挤压面，前倒角，后倒角。

If both extrusion depth and chamfer radius are greater than zero, the text geometry has five elements, corresponding to its front, back, extruded sides, front chamfer, and back chamfer.