8

Raytracer Parameters Rollout 1515
Local Options group
Enable Ray tracing—Turnstheraytraceronoroff.
Default=on.
Even with raytracing off, Ray trace material
and Raytrace map still reflect and refract the
environment, including both the environment
map for the scene, and the environment map
assigned to the Raytrace material.
Raytrace Atmospherics—Turns the ray t racing
of atmospheric effects on or off. Atmospheric
effectsincludefire,fog,volumelight,andsoon.
Default=on.
Enable S elf Reflect/Refract—Tur ns self
reflection/refraction on or off. Default=on.
Can an object reflect itself? For example, a teapot’s
body reflects the teapot’s handle, 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 reflect/refract turned on, you don’t
have to m ake the object
2-sided (page 3–995) .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 3–1040) on or off.
Default=on.
By default, Raytrace materia l and R aytrace map
reflect effects assigned 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 filter (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 assigned to the material’s
Reflection component, the rayt racer will reflect. If
assigned to Refraction, it will refract. If you assign
Raytrace to any other component, you have to
manually specify w hether you want reflected rays
or refracted rays. (Default.)
Note: Auto Detect might fail when you use Raytrace
map in a material with a strong bump m ap. 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: Rayt race reflects and transmits the IDs
in
material effe c ts channel (page 2–1287)
( G-buffer (page 3–1040) ), s o it can create g lowing
reflections, and so on.
Local E xclu de—Click to display the local
Include/Exclude dialog (page 2–1372) .
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 ray tracer.
Background group
Use Environment S ettings—Respects the
environment settings of the current scene.
Co lor Swat ch—Overrides the environment settings
w ith the specified color.
Map B utton—Overrides the environment settings
w ith the specified map.
By specifying an envi ronment map, you override
the environment map for the scene as a whole.
Both reflection and refraction use the scene-wide
envi ronment map u nless you use this option to
specify another map. With this control, you can
use different environment maps on a per-object