一个光源。该类型描述了一个接口，并不打算直接实例化。在一起， A light source. This type describes an interface and is not intended to be instantiated directly. Together,
color and intensity 产生高动态范围光色。 produce a high-dynamic-range light color. intensity 也可以单独使用来调暗或调亮光线而不改变色调。 can also be used individually to dim or brighten the light without changing the hue.
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color : Color
光的颜色。 The color of the light.
强度控制光的强度。 The intensity controls the strength of the light.
intensity 最小值为 0.0，没有最大值。 has a minimum value of 0.0 and no maximum value.