forty-five degree directional (45°x) geometry

irradiation of reflecting materials at 45° to the normal, at one azimuth angle

NOTE1 This geometry emphasizes texture and directionality.

NOTE 2 The "x" in the symbol indicates that the azimuthal direction of the incident beam is in the x direction on the reference plane.

See also CIE 15 Colorimetry (section 5)

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