2012

features and areas in your model. A free spotlight (FREESPOT) is similar to
spotlight. A spotlight has target properties.
Spotlights in Photometric Workflow
In photometric workflow, the hotspot intensity falls to 50 percent. The hotspot
for standard lighting is at 100 percent. At its falloff angle, intensity of the
spotlight falls to zero. Additional properties become available for a point light
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.
The additional information about these properties are available under Lighting
Properties.
2160 | Chapter 44 Add Lighting to Your Model