forty-five degree directional geometry
irradiation of reflecting materials at 45° to the normal, at one azimuth angle
Note 1 to entry: Forty-five degree directional geometry emphasizes texture and directionality.
Note 2 to entry: The "x" in the synonym indicates that the azimuthal direction of the incident beam is in the
Note 3 to entry: This entry was numbered 17-470 in CIE S 017:2011.