emphasis of architectural settings to luminance contrast, a computer-aided lighting design procedure would entail the selection of architectural features as target ...
Summary Most of the visual tasks and objects that lighting designers illuminate have variable material and form properties such as reflectance patterns, textures and differentsurface normal orientations. Their prominent characteristics can be defined as desirable visual features that need to
provide visual impact through illumination. Visual impact can be translated into a luminance contrast two different, representative surface elements of the object. On the basis of the desired luminance contrast and specific material characteristics, luminaire locations can be computed such that the desired luminance values are achieved.
between
Lighting design based
on
luminance contrast
M Moeck Dipl-Ing MS PhD IESNA ACADIA Department of Architectural Engineering, The University of Kansas, Marvin Hall, Lawrence, KS 66045-2222, USA
List of symbols
~~~ Red,
green, and blue diffuse reflectance
(dimen-
sionless) Specularity (dimensionless) Standard deviation (RMS) of the surface slope (dimensionless) Reflectance (dimensionless) p R(P, 0) Value of a ray starting at P in direction b (W sr- IM-2) Eye ray origin elm) PO v Eye ray direction (dimensionless) Intersection point of ray with surface elm) Ps
~~4 ks
fi
Unperturbed surface normal
at
intersection
(dimensionless) d
Real argument number n Material texture vector; [0,0,0] if none (dimension-
