2012

Table Of Contents
when LIGHTINGUNITS is set to 1 (American units) or 2 (International SI units)
for photometric lighting:
Lamp Intensity. Specifies the inherent brightness of the light. Specifies
the intensity, flux, or illuminance of the lamp.
Resulting Intensity. Gives the final brightness of the light. (Product of
lamp intensity and intensity factor. Read-only.)
Lamp Color. Specifies the inherent color of the light in Kelvin temperature
or standard.
Resulting Color. Gives the final color of the light. This is determined
by a combination of the lamp color and the filter color. (Product of lamp
color and filter color. Read-only.)
NOTE When the drawing lighting units are photometric, the attenuation type
property becomes disabled. Photometric lights have fixed, inverse-square
attenuation. The hotspot falloff attenuation in the rendered image varies from
standard lighting, as it uses a different mathematical basis.
Use Weblights
Weblights are photometric lights with customized, real-world light
distributions.
Overview of Weblights
Weblights are photometric lights with customized, real-world light
distributions.
A weblight (web) is a 3D representation of the light intensity distribution of
a light source. Weblights can be used to represent anisotropic (non-uniform)
light distributions derived from data provided by manufacturers of real-world
lights. This gives a far more precise representation of the rendered light than
either spot or point lights are capable of.
This directional light distribution information is stored in a photometric data
file in the IES format using the IES LM-63-1991 standard file format for
photometric data. You can load photometric data files provided by various
manufacturers under the Photometric Web panel in the Properties Inspector
palette for the light. The light icon represents the photometric web you select.
786 | Chapter 13 Render Drawings