Sunlight, Skylight及Daylight

目標
以簡易的方式來描述Sunlight, Skylight及Daylight

說明
Sunlight使用directional light (平行光)
Skylight是大氣中的漫射光
Daylignt = Sunlight + Skylight
Sunlight = {IES Sun light, mr Sun light, standard light}
Skylight = {IES Sky light, mr Sky light, sunlight}

IES Sun light = Photometric light
IES Sky light = Photometric light
mr Sun light = Photometric light
mr Sky light = Photometric light

Standard light ≠ photometric
Skylight ≠ photometric