noun
light source direction
Technical term used in computing, optics, and 3D graphics to specify the direction from which light is emitted or cast.
3Dレンダリングでは、照射方向を変えると影の位置が変わる。
In 3D rendering, changing the light source direction alters the position of shadows.
Compound of 照射 (しょうしゃ, 'irradiation') and 方向 (ほうこう, 'direction').