8

Sampling Quality Rollout (mental ray Renderer) 97
Another technique would be to use the mental
ray material (p age 2–1385)
, and assign shaders
to both the Surface and Contour components.
Tip: The Simple contour shader renders u niform
lines whose color and width you can control.
Theothercontourshadersprovidevariant
contour styles with more direct user controls.
4. On the Render Scene dialog, go to the Renderer
panel. On the Camera Effects rollout, turn on
Enable in the Contours group.
To s i m p l y a d d cont o u r line s t o a r e n d e r i n g ,
leave the shaders in the Camera Effects rollout
set to their defaults. For other options, see
Camera Effec ts Rollout (mental ray Renderer)
(page 3–100)
.
menta l r ay R ender er
Rollouts
Sampling Quality Rollout (mental
ray Renderer)
Rendering menu > Render > Render Scene dialog >
Renderer panel > Sampling Quality rollout
Main toolbar > Render Scene > Render Scene dialog >
Renderer panel > Sampling Quality rollout
Note: The Renderer panel appears only when the mental
ray renderer is the currently active renderer.
The controls in this rollout affect how the mental
ray renderer performs
sampling (page 3–1099) .
Pr ocedur es
To use low sampling for previews:
• Leave the Minimum and Maximum values at
their default settings of 1/4 and 4, or reduce
them to 1/16 and 1/4.
Tip: Do not assig n Minimum and Maximu m
thesamevalue.
To use high sampling for f inal r enderings:
• Increase the Minimum and Maximum values to
4and16,respectively,ortohighervalues.
Tip: Do not assign the same va lue to b oth
Minimum and Maximum.
To vi ew the pattern of s ampling:
•Onthe Diagnostics rollout (page 3–120) ,
choose Sampling Rate, then render the scene.
Instead of rendering the image, mental ray
draws a diagr am that shows the range of applied
sampling values. White lines indicate edges in
the scene, where the mental ray renderer took
the m ax imum number of samples. If fractional
sample limits are used (sampling down), lighter
dots indicate the higher value while darker dots
indicate the lower value.
To assist with analysis, View Samples also draws
red lines around each bucket, or separately
rendered block.
When the Minimum and Maximum number
of samples are equal, the diagram shows all
buckets as white.
Interfa ce