Its dashed line represents the direction in which the maximum energy is radiated, that is the normal to the plane defining the cut of the hemisphere, pointing towards the dark side.
Its dashed line represents the direction in which the maximum energy is radiated, that is the normal to the plane defining the cut of the hemisphere, pointing towards the dark side.
它的虚线代表最大能量发射的方向，正交于定义半球切面的方向，指向没有光线的一边。