Methods that convert the type of an object, returning an independent object of a different type, are often called toType, for example, toString, toArray.
在C++03中,你必须在声明时指定对象类型。
In C++03, you must specify the type of an object when you declare it.
但请注意,我们还没有提到过Array,Date,甚至是函数,因为正式地说,它们都是对象类型。
But notice that we haven't mentioned Array, Date, or even function that's because, officially, they're all of type object.
主要区别在于您希望在场景中使用的对象类型和使用的摄像机类型。
The main difference lies in the type of objects you want to use in your scene or what type of camera you're using.
However, in most geometries(including Euclidean) a line is typically a primitive(undefined) object type, so such visualizations will not necessarily be appropriate.
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