8
48 Chapter 17: Rendering
Increasing the number of bounces increases the level of
global illumination and the am ount of color bleeding in the
rendering.
Co ne Angle—Controls the angle used for
regathering. Re ducing this value can result in
slightly higher contrast, especially in regions w here
lots of s m all geometry casts shadows on a larger
struc ture. Range=33.0 to 90.0. Default=88.0.
All rays initially cast are limited by the cone angle
Volumes toggle—When on the Light Tracer
regathers light from volumetric lighting effects
such as
Volume Light (page 3–284)
and
Vo l u m e
Fog (page 3–280)
.Default=on.
For volumetric lighting to work with light tracing,
Bounces must be greater than 0.
Volumes amount—Multiplies the amount of
light regathered from volumetric lighting
effects. Increase to increase their impact on the
rendered scene, decrease to decrease their effect.
Default=1.0.
Increasing the volumes amount increases the effect of
volumetric lighting in the rendering.
Adaptive Und ersampling group
These controls can help you speed up rendering
time. They reduce the number of lig ht samples
taken. The ideal settings for undersampling vary
greatly from scene to scene.
Undersampling initially takes samples from a grid
superimposed on the pixels of the scene. Where
there is enough contrast between samples, it
subdivides that region and takes further samples,
dow n to the minimum area specified by Subdivide
Down To. Lighting for areas not directly sampled
is interpolated.