2012

Table Of Contents
available for a point light. On the Properties Inspector palette, photometric
properties are
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.
Use Spotlights
A spotlight can be directed towards an object.
Spotlights
A spotlight distribution casts a focused beam of light like a flashlight, a follow
spot in a theater, or a headlight. A spotlight emits a directional cone of light.
You can control the direction of the light and the size of the cone. Like a point
light, a spot light can be manually set to attenuate its intensity with distance.
However, a spotlight's intensity will also always attenuate based on the angle
relative to the spot's target vector. This attenuation is controlled by the hotspot
and falloff angles of the spotlight. Spotlights are useful for highlighting specific
features and areas in your model. A free spotlight (FREESPOT) is similar to
spotlight. A spotlight has target properties.
784 | Chapter 13 Render Drawings