Measurement of illumination
Illumination distribution on the atrium floor.
Presentation of illuminance values measured with a Lux-Meter on the floor of the Atrium under identical lighting conditions as the software evaluation.
Table of measured illuminance at sampled points on the floor of the
Four methods are represented, the first one is rendering using BRDF
measured attribute surfaces. The second uses diffuse Kd and specular Ks
reflectance coefficients averaged from the corresponding BRDF values for
a given material. The third method is similar to the second one. This time
only averaged diffuse reflectance is considered, and we dub this approach
"radiosity". In the last method, surface attributes were evaluated
by visual observation of the materials. We refer to the fourth method as
an "artistic approach". For all methods 84 sample points were considered.
The simulation results were obtained using the Density Estimation Particle
Tracing (DEPT) global illumination algorithm described in  which is
a part of the Inspirer (Integra, Inc.) system.
Summary of comparative data analyses:
 V.Volevich,K.Myszkowski, A.Khodulev, and Kopylov E.A. Using the Visible Differences Predictor to improve performance in progressive global illumination computations. ACM Transactions on Graphics, Vol. 19, No. 2, pp. 122-161, 2000.
Illumination data for z = 9.00
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