2011

Table Of Contents
Intensity factor. Sets a multiplier that controls brightness. Intensity is not
related to attenuation.
Filter color. Sets the color of the light emitted.
Plot glyph. Allows the ability to plot the drawing with the light glyphs on.
Spotlight Hotspot and Falloff Under General Properties
When light from a spotlight falls on a surface, the area of maximum
illumination is surrounded by an area of lesser intensity.
Hotspot cone angle. Defines the brightest part of a light beam. Also known
as the beam angle.
Falloff cone angle. Defines the full cone of light. Also known as the field
angle.
Rapid decay area. Consists of the region between the hotspot and falloff
angles.
The greater the difference between the hotspot and falloff angles, the softer
the edge of the light beam. If the hotspot and falloff angles are near equal,
the edge of the light beam is sharp. Both values can range from 0 to 160
degrees. You can adjust these values directly with the Hotspot and Falloff
grips.
Photometric Properties
Photometric lighting offers additional properties that make the lighting
different than standard lighting. The following properties are under the
Photometric properties panel:
Lamp intensity. Specifies the inherent brightness of the light. Specifies the
intensity, flux, or illuminance of the lamp.
2050 | Chapter 44 Add Lighting to Your Model