启动雾后，离视点较远的物体开始淡化成雾的颜色，同时，雾的浓度可以控制，即随着距离的增加物体变淡的速率可控，雾的颜色也可以任意设定。-Start fog, the distance of objects from the point of view began to play down the color into a fog at the same time, the concentration of fog can be controlled, that is, as the distance increases the rate of变淡controllable object, the color of fog can also be set arbitrarily.