swift3转swift5 The places where Swift isn’t so intuitive. Swift不太直观的地方。 It usually is. Intuitive, that is. Usually Swift is intuitive, with optionals and drag-and-drop kind of building of GUI elements. 通常是这样。 直观,就是这样。 通常…
1.normal vector:When the normal vector is defined as (0,0,1) the grid of rays will be parallel to the Z-axis, but facing the positive Z direction。 解释:这其实决定了grid source面的倾斜方向和光线发射方向。 2.up vector:The …