9

Raytracer Parameters Rollout 1705
Local Options group
Enable Raytr acing—Turnstheraytraceronoroff.
Default=on.
Even w ith raytracing off, Ray trace material
and Raytrace map still reflect and refract the
environment, incl uding both the environment
map for the scene, and the environment map
assigned to the Raytrace material.
Raytrace Atmospherics—Turns the raytracing
of atmospheric effects on or off. A tmospheric
effectsincludefire,fog,volumelight,andsoon.
Default=on.
Enable S elf R eflect/Refract—Turns self
reflection/refract ion on or off. Default=on.
Can an object reflect itself? For example, a teapot’s
body reflects the teapot’s hand le, but a sphere will
never reflect itself. If you don’t need this effect, you
can improve render time by turning off this toggle.
Tip: If you have a transparent object such as glass,
and have self reflec t/refract turned on, you don’t
have to m ake the object 2-sided (page 3–901).The
raytracer sees back faces when exiting refractive
objects.
Reflect/Refract Material IDs—When on, the
material reflects effects assigned to material IDs
in the renderer’s G-buffer (page 3–946) on or off.
Default=on.
By default, Raytrace material and Ray trace map
reflect effects assig ned to a material’s ID, so that
G-buffer effects are not lost. For example, if a
raytraced object reflects a lamp made to glow with
the Video Post Glow fi lter (Lens Effects Glow), the
reflectionglowsaswell.
TraceModegroup
With options in this group, you select whether to
cast reflected or refracted r ays.
Auto D etect—If assig ned to the material’s
Reflection component, the raytracer will reflect. If
assigned to Refraction, it will refract. If you assign
Raytrace to any other component, you have to
manually specify whether you want reflected rays
or refracted r ays. (Default.)
Note: Auto Detect might fail when you use Raytrace
map in a material w ith a st rong bump map. When
you use a strong bump map, choose one of the
explicit options.
Reflection—Casts reflected rays off the object’s
surface.
Refraction—Casts refracted rays into or through
the object’s surface.
Note: Raytrace reflects and transmits the ID s in
material effects channel (page 2–1443) (G-buffer
(page 3–946)), so it can create glowing reflections,
and s o on.
Local Exclu de—Click to display the local
Include/Exclude dialog (page 2–1531).
An object that is excluded locally is excluded from
this map only.
Tip: Using exclusion lists is one of the best and
simplest ways to speed up the raytracer.
Background group
Use Environment S ettings—Respects the
environment settings of the current scene.
Co lor Swatch—Overrides the envi ronment s ettings
w ith the specified color.
Map Button—Overrides the environment settings
w ith the specified map.
By specifying an environment map, you override
the environment map for the scene as a whole.
Both reflection and refraction use the scene-wide
env ironment map unless you use t his option to
specify another map. With this cont rol, you can
use different environment maps on a per-object