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1288 Chapter 15: Lights and Cameras
Tra nsp. ( Trans parency) —
When on, turns on
transparency for advanced ray-traced and area
shadows. Has no effect on shadow-mapped or
standard ray-traced shadows. Default=off.
The shadow transparency control is on the
Optimizations rollout (page 2–1361).
Int . (Integr i t y)—For advanced ray-traced shadows
or area shadows, sets the Shadow Integrity. See
Advanced Ray-Traced Pa rameters Rollout (page
2–1356) or Area Shadows Rollout (page 2–1357).
Default=1.
Qual. (Quali ty) —For advanced ray-traced shadows
or area shadows, sets the Shadow Quality. S ee
Advanced Ray-Traced Pa rameters Rollout (page
2–1356) or Area Shadows Rollout (page 2–1357).
Default=2.
Decay—(StandardLightsonly.) Setsthetype
ofdecay:None,Inverse,orInverseSquare.
See Attenuation Parameters (page 2–1345).
Default=None.
Start—(Standard lights only.) Sets the start range
for decay. See Attenuation P arameters (page
2–1345).Default=0.0.
Lengt h—(Photometric lights only.) Sets the Length
value for Linear and Area photometric lights. See
Linear Light Parameters Rollout (page 2–1354) or
Area Light Parameters Rollout (page 2–1354).
Width—(Photometr ic lights only.) Sets the Width
value for Area photometric lights. See Area Light
Parameters Rollout (page 2–1354).
Standard Lights
Standard lights are computer-based objects that
simulate lights such as household or office lamps,
the light instruments used in stage and film
work, and the sun itself. Different kinds of light
objects cast light in different ways, simulating
different kinds of real-world light sources. Unlike
photometric lights (page 2–1301),standardlights
do not have physically-based intensity values.
There are eig ht typ es of standard light objects:
Target Spotlight (page 2–1289)
Free Spotlight (page 2–1290)
Target Direct Light (page 2–1292)
Free Direct Light (page 2–1293)
Omni Light (page 2–1295)
Skylight (page 2–1296)
mr Area Omni Light (page 2–1298)
mr Area Spotlight (page 2–1299)
Most of the parameters for standard lights are
common to a l l five t ypes. These are described in
the following topics:
General Lighting Parameters (page 2–1331)
In tensity/Color/Attenuation Par ameters (page
2–1345)
Advanced Effects Rollout (page 2–1341)
Shadow Parameters (page 2–1337)
mental ray Indirect Illumination Rollout (for Lights)
(page 2–1343)
Spotlights and Directional lights have rollouts
specific to them:
Spotlight Parameters (page 2–1338)
Directional Parameters (page 2–1348)
For parameters specific to a particular kind of
light, see that light’s description.
Shadow Parameters
Different rollouts can appear, depending on which
type of shadows you have chosen for a light: