So far the examples have picked objects using the default shape: an imaginary ray going from the viewer's eye position through the mouse pointer into infinity.
目前为止的例子都是使用缺省形状拣选对象：可以假想是一根从观察者眼睛的位置经过鼠标点至无穷远处的射线。
So far the examples have picked objects using the default shape: an imaginary ray going from the viewer's eye position through the mouse pointer into infinity.
目前为止的例子都是使用缺省形状拣选对象：可以假想是一根从观察者眼睛的位置经过鼠标点至无穷远处的射线。
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